Exhaust Leak Cause Lean Condition

7) Exhaust leaks. On a 4-Stroke (usually Honda) the smoke typically blows out of the crankcase vent rather than the exhaust pipe. Basically this means that an oxygen sensor in bank 1 has detected a lean condition (too much oxygen in the exhaust). Dryer pipe leaks often arise as the result of their proximity to water sources or condensation. This condition will cause the exhaust gas mixture to be lean, even though. If it runs well on the second start though, it's probably not the only cause. leaks will become wet and easily visible. If I remember correctly (this was about 10 years ago), the car just didn't want to run smooth. Try putting some distance between the dryer and air conditioner pipes so that each has its own designated operating room. You should get a bung put in the collector of the header tube for the wideband so theres little chance of a leak affecting it. It's a quick sure fire way to rule out an exhaust leak. So I said ok and got it done for about $30. Most Common Causes Of P0171, P0174 DTCs. I tightened the manifolds which help but now the leak is back again so I’ll replace the gaskets. To check for this condition remove the oil fill cap when the engine is running and you will see a distinctive pulse of smoke forced outward from the inside of the engine. A leaking fuel injector causes a rich fuel mixture. Check the fuel pressure. Exhaust gas leakage before the O2 sensors can trick them and cause code P0171. Exhaust Leak. Backfiring that results from damaged wiring disrupts the ignition’s timing, which causes a build-up of air and fuel in the engine. Exhaust leaks can also make it appear to the PCM that the catalytic converter is working poorly or that the engine is running too lean; triggering an engine light in either case. Also inspect PCV valve for being the correct one for this application. Exhaust manifolds crack for a couple of reasons. Possible Causes : An air leak forward of the DPF will change the sensor readings resulting in the code Rusty exhaust systems, cracked exhaust manifolds or damaged or missing gaskets or donuts will cause air leaks. You Have a Leak. A third sign your exhaust may be leaking is if your gas pedal vibrates while you are driving. The lean condition can be caused by a vacuum leak, which introduces more air into the air-fuel mixture, or by a weak fuel system, which does not input enough fuel into the air-fuel mixture. It's a quick sure fire way to rule out an exhaust leak. EGR valve. 7, once the exhaust gas leak flag has been set to unity, the warning lamp automatically remains lit without performing an exhaust gas leak diagnosis, however an exhaust gas leak diagnosis can be made even when the exhaust gas leak flag is unity, and the warning lamp turned on or off according to the result. The O2 sensors monitor this ratio as it enters the exhaust pipes after if is burned. Clogged Exhaust System : Extreme lean condition in fuel system : Head Gasket/Head Failure : Defective fan clutch causes excessive vibration. This is due to the fact the O2 Sensors are detecting Oxygen in the exhaust gases. could leak cause the lean or am i looking at a carb issue?. It can run your motor lean, make it run like crud, lower fuel economy the results are multiple and never positive. This can cause a hesitation, stumble and/or rough idle problem as well. Backfiring that results from damaged wiring disrupts the ignition’s timing, which causes a build-up of air and fuel in the engine. An exhaust leak can decrease fuel efficiency, causing your engine to work harder, and you to fill up your gas tank more frequently. Blue smoke is coming from my exhaust This is a definite indication that this engine is burning oil. This is the Exhaust Gas Recirculation valve, which sends some of the engine's exhaust gases back through the intake system to lower the vehicle's emissions. Another cause of blue smoke is bad valve stem seals. Unfortunately, when we have a rich or lean condition, we usually look for external engine problems first. I had a lean running condition with it once that turned out to be a leaking EGR valve. Check fuel pressure to make sure its within spec. if exhaust can go out, air can go in. If a valve leak is significant, engine performance will deteriorate and/or noise and vibration will increase significantly. Vacuum Leak: A large vacuum leak will cause the motor to run lean on both banks. Modern O2 sensors are incredibly accurate, sensing the smallest changes in the amount of oxygen in the air. Exhaust leak. While not often associated with a carburetor problem, an exhaust leak is often overlooked and can lead to off-idle hesitation and deceleration pops. , ECT, IAT or MAP) Fuel delivery component fault (clogged filter, low fuel pressure). Check the manifold vacuum with a vacuum gauge. The cat will eventually break apart internally clogging the exhaust system. This lean mixture can quickly result in a seized piston. General Q & A - Exhaust leak - My boat has developed an exhaust leak & the RPMs are down. To check for this condition remove the oil fill cap when the engine is running and you will see a distinctive pulse of smoke forced outward from the inside of the engine. Any leak forward of the oxygen sensors can cause a false reading and a fault code to be set. You can test for leaks by performing a smoke test. #3 09-24-2007, 05:46 PM vaulb Registered User Join Date: Sep 2007 Posts: 1. Ford fuel pressure regulator. Test for Exhaust Leak. Just naming possible suspects. Leaking will usually be quite steady if the ceiling leak is plumbing-related. You could hear the exhaust leaking out. Sometimes very lean. The ecu perceives a lean running condition and dumps fuel, causing misfires and occasionally shut-off. There are lots of faults that can cause rich and lean conditions, but not so erratically. Would an exhaust leak like this cause any lean symptoms? I am running pretty fat jetting, 45 pilot, NOZF #3,175 main, with stock pipe and silencer, 50/50 gas at 40 to 1. purge valve working fine. It's a quick sure fire way to rule out an exhaust leak. Depending on where the vacuum leak is located, it could cause a variety of other problems. I think you would hear an exhaust leak in the manifold, but that would almost always cause this code. Many things can contribute to a lean condition as noted above, but two other possible causes not mentioned are 1. PCV System: A stuck closed PCV valve causes excessive crankcase pressure, resulting in blue/gray exhaust. Compression leaks (bad exhaust valve that allows unburned oxygen into exhaust and fools O2 sensors) Exhaust manifold crack or gasket leak (allows unburned air into exhaust and fools O2 sensors) Bad O2 sensor (signal shorted to ground so the sensor reads lean all the time) Some possible causes of RICH fuel mixtures include: Leaky fuel injector. If there was a leak present in the exhaust before the front O2 sensor then fresh air is sucked in and the O2 content of the exhaust gases is altered, making the O2 sensor see a leaner mixture than it actually is. A leak in the exhaust will let fresh air get into the system through exhaust vent’s negative pressure side, causing the oxygen sensor to show a lean reading. An exhaust leak will cause the O2 sensors to go whacky. A lean condition at higher RPMs but not at idle is an indication of a fuel delivery problem like pump and filter. Causes include worn, fouled or damaged spark plugs, bad plug wires or even a cracked distributor cap. That will cause lean condition, code P0171, rough idle and bad fuel economy since the computer is constantly trying to adjust for the lean condition. Now back to the list… 2. There are also some other possibilities such as an internally leaking EGR system. Vacuum leaks and exhaust leaks are the more common causes for this type of computer code. When DTCs P0133 and P0153 are set at the same time, it is a good indication that a fuel contamination condition is present. It would depend on how bad the exhaust leak is. The Cometic's are the way to go. VACUUM LEAKS. While, Too lean and the converter is unable to convert the hydrocarbons into safe elements; and may not pass a state inspection. When STFT hits its limit (-25%), the HO 2 S finally drops, and is then stuck lean until STFT is able to climb back up to normal levels. After-fire can be also be caused by cold air being introduced into the exhaust system. This lean mixture can quickly result in a seized piston. There may also be some detonation during part throttle acceleration in the 2500 - 3000 rpm range, (although this may have other causes such as an ignition that advances too quickly). If it is getting out of the exhaust before the O2 sensor, then obviously the sensor is not going to be able to read it and it will end up being "tricked" into thinkin there is a lean condition with less fuel being burned while there actually isnt. Vacuum leaks: Have only done a quick vacuum leak test as I have trouble understanding why a vacuum leak would cause a rich condition and if anything a slightly low idle (750rpm) on a MAP engine. the best way i find exhaust leaks and see how severe they are is by seafoaming the engine through the brake booster vac line. If the timing chain and guides are worn, replace the water pump as well. bad or Clogged EGR Valve/System. Also inspect PCV valve for being the correct one for this application. On V6/V8/V10 engines, Bank 1 is the side of the engine that has cylinder #1. Compression leaks (bad exhaust valve that allows unburned oxygen into exhaust and fools O2 sensors) Exhaust manifold crack or gasket leak (allows unburned air into exhaust and fools O2 sensors) Bad O2 sensor (signal shorted to ground so the sensor reads lean all the time) Some possible causes of RICH fuel mixtures include: Leaky fuel injector. But it is next to impossible to walk the line between too rich or too lean. This is an indicator of the fuel mixture integrity. In climates with warm humid summers, depressurization can draw moist air into building wall cavities, where it may condense and cause moisture damage. I agree on fuel delivery issues-check fuel pressure/regulator,fuel pump,clogged injectors/leaking o-rings. it wil suck in Water /air/exhaust wich wil lead to running lean, water in the block and your bearings tu rust. All it takes for fuel to varnish is about 6 to 8 months of sitting. This could result in fuel trim problems and a check engine light, possibly with Fuel System Rich DTCs, such as P0172 or P0175. as the car has only one MAF for both banks and bank 2 runs fine, i think it drops out of the picture. A leaking fuel injector causes a rich fuel mixture. 7:1 air/fuel ratio), but the exhaust gas mixture will be lean. I am under the impression that exhaust leaks usually make you run rich, as most lose gas mileage when you get one. If the mixture is still lean at 1000 through 1800 rpm, the idle channel restriction, if used, may have to be slightly enlarged to allow more fuel to be delivered at part throttle. What causes exhaust to break. That is a definite possibility, ride with the cap loose or off and see what happens. There's three main things that can cause a lean fault: Bad oxygen sensor; Bad mass airflow sensor; Vacuum leaks (Most common) If you have a lean fault, check the freeze frame data in the OBD scanner. 7) Exhaust leaks. An EGR valve that is stuck open can result in a fuel-air mixture that is too lean. if the leak is between the o2 housing and the. The short term FT values change rapidly in response to the HO2S voltage signals. When diagnosing rich or lean trouble codes, we always start by reviewing the fuel trims. This causes the actual air flow to be higher than the mass air flow sensor measures. Do not replace O2 sensors when you have those codes. You mentioned an exhaust leak. If the engine is dealing with a leaking vacuum hose or a stuck injector, it can’t switch the fuel mixture properly to replenish oxygen and reduce harmful contaminates. Intake leaks can overwork or even destroy a turbo and cause a rich or lean condition in the engine. You might also want to switch to a colder heat range plug. More Ford 4. Since O2 and A/F sensors are located in the exhaust stream, any leakage upstream or even nearby may be misinterpreted as a lean condition because outside air is pulled into the leaking exhaust pipe during the low-pressure phase between firing events. If you had one, you should have picked it up with your test. This step tests the integrity of the signal circuit to the PCM. Also inspect PCV valve for being the correct one for this application. Spark plugs that show preignition or detonation damage may indicate a need to check timing, the operation of the cooling system and conditions that cause a lean air/fuel mixture. Atmospheric pressure lowers the engine vacuum, by leaking through the diaphragm. One of the possible causes for the lean condition that showed up on the print out that they give you at O'Reilley Auto Parts was an exhaust leak. A lean condition at higher RPMs but not at idle is an indication of a fuel delivery problem like pump and filter. Well, Kristopher, this gives you a few things to check to try and fix that lean condition and get rid. I think you would hear an exhaust leak in the manifold, but that would almost always cause this code. A vacuum leak causes DTCs P0171 and P0174 to set at the same time. The O2 sensor indicated we were a tad rich on the pilot and needle. This is due to the fact the O2 Sensors are detecting Oxygen in the exhaust gases. Airflow sensor, fuel pressure, or things common to both banks will not trigger a single bank code. When your engine runs too rich or too lean of fuel, your dirt bike starts to backfire with a loud sound. Exhaust leak cause lean condition Odoo ERP is emerging faster than any other propriety ERP owing to the fact that it is Open Source. As a result, the PCM miscalculates the amount of the injected fuel, and the engine runs "lean". A head gasket failure may be caused by an engine overheating one too many times (as a result of a clogged radiator, coolant leak, faulty fan, etc. Even though the Engine Control Module (ECM) is built to be able to bring a lean condition back to normal, it can only do so up to a certain extent, thus the P0174 code may be needed to alert the user to resolve this issue. After installing a new exhaust the expansion and contraction of the metal can loosen up the nuts. A bad vacuum leak can lean out the mixture enough to cause an engine backfire. Check the fuel pressure. if the leak is between the o2 housing and the. lean to incline: lean on me; thin, skinny, lank, lanky; sparse; economical Not to be confused with: lien – legal claim lean 1 (lēn) v. Checked compression and all but #5 were ~ 160. Yet another prevalent cause of Ford P0171 and P0174 ean codes is definitely an engine vacuum leak. The sonic wave back to the engine will pull air into the chamber when it is trying to hold in the new charge. With Cis, a leak before the O2 sensor can indeed cause the car to die. See full list on autoservicecosts. General vacuum leaks will do it too, like upper/lower leaks. “Ultimately, a simple air leak can cause a lean condition that will cause an excess of temperature in the exhaust system, which can cause a thermal event, rendering the DPF inoperable and. The ecu perceives a lean running condition and dumps fuel, causing misfires and occasionally shut-off. Computerized Engine Controls (CEC) - Monitors and controls a variety of engine/vehicle functions. from the carburetor, exhaust and breather hose. WILLIAMS October 31, 2015 at 3:58 am. This indicates that there is unburned fuel in the exhaust and will send a signal to the ECM to lean the air/fuel mixture out. If it comes back again, then check your o2 sensor conenctions and make sure they are clean and good. In most cases the leaks are on the sides of the engine or in the rear of the engine where the exhaust manifolds attach to the engine, or the point where the exhaust pipes attach to the exhaust manifolds. If I remember correctly (this was about 10 years ago), the car just didn't want to run smooth. That is a definite possibility, ride with the cap loose or off and see what happens. Almost any sensor that monitors airflow or fuel pressure can cause a lean condition. An intake leak would certainly give you lean condition symptoms. Ignition: Under normal conditions dual fire ignitions present no problems. Readjusted valves checked for vacuum leaks with carb spray around intake. If it's after the turbo, it won't affect anything. air is getting into the exhaust stream upstream of that O2 sensor. If you notice a very strong exhaust smell in the car then you probably have a leak in the exhaust. 7, once the exhaust gas leak flag has been set to unity, the warning lamp automatically remains lit without performing an exhaust gas leak diagnosis, however an exhaust gas leak diagnosis can be made even when the exhaust gas leak flag is unity, and the warning lamp turned on or off according to the result thereof. The internal cylinder condition is just as important, […]. The most common entry point is the junction of the header pipes and mufflers. i thought 1996 was when everything was obd-2 compliant. The only other possibilities are wiring issues, and computer concerns. Internal cooling system leaks can destroy a catalytic converter. What causes code P0174 Bank 2 lean? catalytic converter, oxygen sensor, exhaust leak. 3 - External Leak. 7L engine was a fairly good engine. VACUUM LEAKS. 2006 Trailblazer P0171 Volvo. The cat will eventually break apart internally clogging the exhaust system. Conversely, if the mixture is lean, the PCM responds by richening the mixture in order to maintain a 14. This is a lean misfire. September 15, 2007 Code P1131 indicates a lean condition, meaning too much air and not enough fuel. These codes are set by the car’s computer when it sees too much oxygen in the exhaust. I agree on fuel delivery issues-check fuel pressure/regulator,fuel pump,clogged injectors/leaking o-rings. Rotten egg smell: Sulfur is being emitted from the exhaust due to a faulty catalytic converter. Excessive oxygen readings in the exhaust will set lean codes. Whatever the cause, high HC-only emissions usually indicates a lean misfire, an ignition failure or an engine mechanical problem. Check for cracked hoses a bad gasket or a faulty EGR or PCV Valve. Do not replace O2 sensors when you have those codes. You did state it was a California Emissions Vehicle. Problems with drain pipes may cause more intermittent leaking, but unlike roof leaks, there is no correlation to weather conditions. Replaced with new headers. B Late valve timing. Since O2 and A/F sensors are located in the exhaust stream, any leakage upstream or even nearby may be misinterpreted as a lean condition because outside air is pulled into the leaking exhaust pipe during the low-pressure phase between firing events. Check Engine Light/Trouble codes. Check for head gasket leak and did a block test and all was good. If you had one, you should have picked it up with your test. If a car has a check engine light on and has P0171 and P0174 codes stored, the most likely cause is a vacuum leak. Hot exhaust gases can leak into the cooling system, or coolant can leak into the cylinders and be burned off as steam, either way. It was used in Japan on Toyota Carina T150 replacing the TTC-V (Vortex) exhaust gas recirculation approach used earlier, Toyota Corolla E80 , and Toyota Sprinter. If there are no intake leaks, the next step is to replaced the air filter and clean the air flow meter. TEST 2: Inducing A Rich Condition. Internal coolant leaks can foul a spark plug and cause a misfire. Vacuum leaks: Have only done a quick vacuum leak test as I have trouble understanding why a vacuum leak would cause a rich condition and if anything a slightly low idle (750rpm) on a MAP engine. If DTC 174 is also set indicates both banks of the engine are operating lean. So if 100% that int and exh sensors are good and correct then recheck pipes and tubes near throttle body like the evap solenoid circuit. This will typically set a separate code. If you feel the carb is dirty or it has water in the boawl it should be rebuilt. The Cometic's are the way to go. I eliminated the pcv system from the intake manifold to remove any problems with vacuum leak through it and cleaned my maf, tps, throttle body, and checked all seen connections. This lean mixture can quickly result in a seized piston. If the P0171 Volvo is combined with the P0174 Volvo code, it’s very likely that the problem is caused by an intake leak. VACUUM LEAKS. This fault is both common and a clear indication of a sticky HO 2 S. now i have the following problem - a couple of days ago while driving the MIL light came on and the fault code i pulled out using vcds was that bank 1 was too lean. For your header leak, have you tried a fresh gasket smeared with 22B exhaust gasket(red tube) sealer?. However, a vacuum leak such as rotted or loose vac hoses can also cause issues, but you usually get a check engine and the dreaded high idels response. In climates with warm humid summers, depressurization can draw moist air into building wall cavities, where it may condense and cause moisture damage. 5L V6 Auto) - Fuel System Lean (Bank 1) Possible Causes: Air leaks in intake manifold, exhaust pipes or exhaust manifold Base engine mechanical problem causing a lean A/F condition Fuel control Sensor is out of calibration (e. 45*: injector leak 51*: injector circuit 53*: exhaust gas sensor circuit (right) 54: signal circuit from A/T control to ECU 55: NOmalfunctions in the above *Will cause the Check Engine light to come on under normal (MODE I) operating conditions. Typical causes for this code include: 1) O2 sensor defective or lead shorted 2) Lean injectors (dirty or blocked) 3) Water in fuel 4) Exhaust leaks upstream of O2 sensor 5) Fuel pressure or volume too low 6) MAF sensor reading lower airflow than is actually present 7) Vacuum leaks 8) Incorrect or poorly calibrated PROM in the ECM Return to Chart. 4L Diagnostic Tutorials. A cracked head may allow coolant to leak into one or more cylinders or into the combustion chamber of the engine. A weak coil or excessive rotor gas inside a distributor would affect all cylinders, not just a single cylinder. The short-term fuel trim will be instantly corrected at first. If the HO2S indicates a rich condition, the FT values will be below 0 percent. This is due to the fact the O2 Sensors are detecting Oxygen in the exhaust gases. Access quality crowd-sourced study materials tagged to courses at universities all over the world and get homework help from our tutors when you need it. The ecu perceives a lean running condition and dumps fuel, causing misfires and occasionally shut-off. Contaminated fuel is another. There are several reasons for a failure like this, here are the most common; air-leak at the magneto side crankshaft seal, too lean carb jetting, too far advanced ignition timing or faulty igniter box, too hot of. I attributed it to unburned gases in the exhaust igniting on decelleration and jetting wont help that. EGR valve. While not often associated with a carburetor problem, an exhaust leak is often overlooked and can lead to off-idle hesitation and deceleration pops. In addition, if the fuel level in the float chamber is set too low, insufficient fuel will be drawn through the main jet. exhaust side. Would an exhaust leak like this cause any lean symptoms? I am running pretty fat jetting, 45 pilot, NOZF #3,175 main, with stock pipe and silencer, 50/50 gas at 40 to 1. The sonic wave back to the engine will pull air into the chamber when it is trying to hold in the new charge. This, combined with a compression test on cylinder 2 of 40 psi, led many folks to suspect a burnt exhaust valve. I can only add my 2 cents from past experience with my old 86 GT. it wil suck in Water /air/exhaust wich wil lead to running lean, water in the block and your bearings tu rust. as the car has only one MAF for both banks and bank 2 runs fine, i think it drops out of the picture. An exhaust leak will cause the O2 sensors to go whacky. The exhaust system manages both pressure and vacuum cycles the engine runs. You can easily deal with the fuel pressure regulator by replacing the fuel filter. Check the engine compression. With a leak of sufficient magnitude, the PCM can end up substantially increasing fuel delivery in an attempt to “correct” the perceived lean condition. Common on this truck. (Exhaust smell, sooty tailpipe, low mileage, cold weather). air is getting into the exhaust stream upstream of that O2 sensor. All things being the same in each cylinder, the one with any significant exhaust leak would show lean because the leak affects that illusive back pressure in the pipe. Broken Piston Ring: If a particular cylinder piston ring breaks it will allow cylinder compression to leak outward into the crankcase. Inside the cat all this extra fuel is ignited, causing the cat to overheat. It can burn holes in your pistons, valves, head gaskets, etc. A vacuum leak will cause a rough idle and sometimes it can be tricky to spot through the seemingly endless maze of hoses of cars of the ’60s and ’70s. Whether or not thats your problem its worth fixing before it causes bigger problems. Retighten and try again. Too rich and the catalyst can melt down. Inspect all areas of the engine for a vacuum leak. Whatever the cause, high HC-only emissions usually indicates a lean misfire, an ignition failure or an engine mechanical problem. As the operating condition gets leaner, the spark plug provides the same amount of energy -- but it is still enough energy to ignite. Ford fuel pressure regulator. This lean mixture can quickly result in a seized piston. It would depend on how bad the exhaust leak is. This causes the actual air flow to be higher than the mass air flow sensor measures. Perform a leak-down test to make sure the cooling system holds system pressure (check pressure cap for exact pressure) for 15 minutes. 7: 1 air/fuel ratio under most operating conditions. This causes carbon chunks to block open the diverter valve and lean out the mixture. Maybe a leak in the EGR system. 18) O 2 and CO 2 are indicators of exhaust system integrity, sample hose and probe integrity, or both. Could it be so that case center gasket starts to leak only when engine is hot or under load? Could carbonized exhaust cause lean condition for the engine?(expansion chamber should be clean and silencer wools are recently changed) Im starting to get desperated cos there is no good reason for the engine to run so lean. on-boost blowing air out. You may nd a cracked pipe on Bank 2, a cracked catalytic converter on Bank 1, or any of these DTC's - P0171, P0174, P0420, P0430, P2096, P2097, P2098, or P2099. Use this Intake Leak Pressure Tester to make sure you get 100% performance from your turbo. In addition, if the fuel level in the float chamber is set too low, insufficient fuel will be drawn through the main jet. If the timing chain and guides are worn, replace the water pump as well. No leak found… I cannot find any leaks in the exhaust system, particularly not between manifold and O2 sensor. To eliminate your intake leaks, simply attach this Intake Leak Pressure Tester to your turbo inlet and apply compressed air through the standard tire. could leak cause the lean or am i looking at a carb issue?. Assume there is no O2 sensor code. After-fire can be also be caused by cold air being introduced into the exhaust system. Consequently, sending this information back to the engine computer; for emissions control and fuel-metering decisions. While riding, listen for a ticking sound, one that gets louder and faster with engine speed and decreases with slower engine speed as well. Yet another prevalent cause of Ford P0171 and P0174 ean codes is definitely an engine vacuum leak. com P0171 & P0174 Lean condition. They shouldn't test it in that condition, and it will fail with a reason along the lines of "exhaust emissions not tested due to significant leak of exhaust gases from the exhaust system". if the leak is between the o2 housing and the. The step by step is : A) Seal off the intake manifold with a plug or rubber gasket. Basically this means that an oxygen sensor in bank 1 has detected a lean condition (too much oxygen in the exhaust). All things being the same in each cylinder, the one with any significant exhaust leak would show lean because the leak affects that illusive back pressure in the pipe. The fuel trims show what the computer is trying to do to correct the problem. General vacuum leaks will do it too, like upper/lower leaks. The sonic wave back to the engine will pull air into the chamber when it is trying to hold in the new charge. You could spray some TB cleaner around your vacuum lines and it will cause a higher idle wherever there is a vacuum leak. The flame front can then travel up the intake and cause a backfire. Airflow sensor, fuel pressure, or things common to both banks will not trigger a single bank code. Well the rear most bolt is somehow broken off flush with the head and the shop wants to remove the enitre head to get this out, which will cost me roughly $900. if exhaust can go out, air can go in. The high pressure po. The O2 sensor normally outputs a value between 0 and 1 volt. The internal cylinder condition is just as important, […]. It is the interaction of this fresh air on the O2 sensor allows the code to occur. B Late valve timing. The term "lean" means too much air and too little fuel. I would reset the computer to see if it was just a glitch since this is showing a lean condition on both bank 1 and 2. Broken Piston Ring: If a particular cylinder piston ring breaks it will allow cylinder compression to leak outward into the crankcase. Maybe my understanding of how the system operates is wrong. Oil leaking into the cylinders can cause a rough idle, misfire and fouled spark plugs. did a test with smoke machine - no vacuum leaks. Air leaks are, by far, the number one cause of vintage engine piston seizures. No leak found… I cannot find any leaks in the exhaust system, particularly not between manifold and O2 sensor. An exhaust stream is actually a series of pulses with high and low pressure zones. 45*: injector leak 51*: injector circuit 53*: exhaust gas sensor circuit (right) 54: signal circuit from A/T control to ECU 55: NOmalfunctions in the above *Will cause the Check Engine light to come on under normal (MODE I) operating conditions. Would an exhaust leak like this cause any lean symptoms? I am running pretty fat jetting, 45 pilot, NOZF #3,175 main, with stock pipe and silencer, 50/50 gas at 40 to 1. Airflow sensor, fuel pressure, or things common to both banks will not trigger a single bank code. Inspect items that would cause both banks to operate lean. An exhaust leak near the front O2 sensor could cause a false lean reading which would force the ECU to add fuel. The Air/Fuel ratio sensor is the common cause of this code/condition. PCV System: A stuck closed PCV valve causes excessive crankcase pressure, resulting in blue/gray exhaust. Exhaust manifolds crack for a couple of reasons. This lean mixture can quickly result in a seized piston. If gas filter is blocked or perhaps the gas pump pressure is reasonable, there might be higher degree of oxygen in the exhaust also. Keeping the cooling water and exhaust gasses separated until they exit the riser is crucial. In case the amount of the compensation value is extremely large (The actual mixture ratio is too lean. the best way i find exhaust leaks and see how severe they are is by seafoaming the engine through the brake booster vac line. Backfiring during acceleration can also be caused by internal carburetor problems, low compression, leaks in the fuel tank, lean engine conditions, and weak or broken valve springs. GM, in all its infinite wisdom, uses plastic and rubber gaskets for the intake manifold and plenum gaskets. A failing (O2) sensor will cause: A rich-running condition. Other things that can cause it are exhaust leaks - not really a lean condition, just a false reading - whoops saw you fixed that Check for air leaks in any intake piping between the MAF and TB. However, a vacuum leak such as rotted or loose vac hoses can also cause issues, but you usually get a check engine and the dreaded high idels response. Checked compression and all but #5 were ~ 160. You can test for leaks by performing a smoke test. A lean condition at idle only, and not higher RPMs is a possible indication of a vacuum leak. It's a quick sure fire way to rule out an exhaust leak. This causes carbon chunks to block open the diverter valve and lean out the mixture. Check the ignition rotor to make sure that it is in good condition. To keep the engine running properly, the powertrain control module (PCM) tries to compensate for the lean condition by injecting more fuel to the mixture in. When your engine runs too rich or too lean of fuel, your dirt bike starts to backfire with a loud sound. When an exhaust leak is present, the ECU can detect a false lean signal and respond incorrectly, adding fuel in an attempt to remedy the problem, but further exacerbate it. You mentioned an exhaust leak. PM's Senior Automotive Editor, Mike Allen, outlines the tools and techniques proven to smoke out even the toughest to find vacuum leaks. Check vacuum at idle - should be 18-22 with a stock cam and lower with a more radical cam. This lean mixture can quickly result in a seized piston. I know an intake leak or vacuum leak can cause a lean condition. on-boost blowing air out. A leaking exhaust will not cause low compression. At this point, a code will be set like P0170 or P0171 for a lean condition, and the long-term fuel trim will be maxed out. from the carburetor, exhaust and breather hose. If there are no intake leaks, the next step is to replaced the air filter and clean the air flow meter. Well, I have a really unstable mixture at idle (mostly lean) and am wondering if an exhaust leak can cause this and also the hesitation that occurs at about 1000 rpm every time I start to accelerate. How does a leaking intake valve create the positive fuel trim adjustment?. If the lean codes keep coming back, the MAF sensor may have to be replaced if the engine does not have a vacuum leak or fuel delivery problem. now both cylinders have a very small exhaust leak and it is running lean. Atmospheric pressure lowers the engine vacuum, by leaking through the diaphragm. Both conditions occur when a very lean air/fuel mixture burns so slowly in the combustion chamber that it is still burning when the exhaust and/or intake valves open. Check for head gasket leak and did a block test and all was good. P0171 Lean condition. Two other causes of rotten eggs besides a broken catalytic converter include an engine that is running too hot or a broken fuel pressure regulator. An internal leak could be caused by a leak in the head or block or perhaps a leaky head gasket which lets the coolant escape its system. Retighten and try again. An exhaust leak downstream of a post catalyst O2 sensor cold cause a change in ECM fuel trims. A cracked head may allow coolant to leak into one or more cylinders or into the combustion chamber of the engine. If the HO2S indicates a rich condition, the FT values will be below 0 percent. When faced with a smoke issue, don't continue riding. A: In the 2002 Corolla, the code P0171 is often caused by a bad or dirty mass airflow sensor or vacuum leaks. Vacuum leaks: Have only done a quick vacuum leak test as I have trouble understanding why a vacuum leak would cause a rich condition and if anything a slightly low idle (750rpm) on a MAP engine. These are possible causes: Fuel Injectors: A leaking or dripping fuel injector will cause a rich fuel condition. ) Vacuum leaks can cause a lean condition and/or possibly a high idle. You can test for leaks by performing a smoke test. While not often associated with a carburetor problem, an exhaust leak is often overlooked and can lead to off-idle hesitation and deceleration pops. #3 09-24-2007, 05:46 PM vaulb Registered User Join Date: Sep 2007 Posts: 1. Shops have simple ways to test for all of these. To check for this condition remove the oil fill cap when the engine is running and you will see a distinctive pulse of smoke forced outward from the inside of the engine. The O2 sensor normally outputs a value between 0 and 1 volt. The most-likely cause of this reading is: A Burned exhaust valve. Ford TSB 04-17-4 details procedures for checking fuel trim and looking for vacuum leaks. Basically this means that an oxygen sensor in bank 1 has detected a lean condition (too much oxygen in the exhaust). I would check the valve stem seals and see what they look like. With every revolution of the crankshaft, small changes in the air, fuel and operating conditions can cause changes to the oxygen content coming out of the exhaust port. A third sign your exhaust may be leaking is if your gas pedal vibrates while you are driving. Exhaust ventilation systems are relatively simple and inexpensive to install. If you had one, you should have picked it up with your test. Lab scopes can also be used to monitor the switching. purge valve working fine. There are also some other possibilities such as an internally leaking EGR system. if the leak is between the o2 housing and the. 7 air fuel ratio. This condition is generally caused by the incorrect fitting of after-market accessories such as exhaust systems, air filter systems, or replacement carburetors of a different type or size. Conclusion:. Try putting some distance between the dryer and air conditioner pipes so that each has its own designated operating room. Oil leaking into the cylinders can cause a rough idle, misfire and fouled spark plugs. The good news is, most of these components have their own trouble codes, which will also trigger when there is a problem. The Possible Causes Of Rich Codes Are: A leaking or faulty fuel. Other possible causes: Air Leaks: Any source of fresh air into the exhaust system can create or worsen the conditions that bring about exhaust backfiring. , before the turbo) would suck in unwanted/unmetered air and it would go lean. While not often associated with a carburetor problem, an exhaust leak is often overlooked and can lead to off-idle hesitation and deceleration pops. Set the ignition timing to specifications. Lean mixtures which cause misfires will damage the cat. You could spray some TB cleaner around your vacuum lines and it will cause a higher idle wherever there is a vacuum leak. Clamping off the hoses will reveal if that is the issue. I can only add my 2 cents from past experience with my old 86 GT. Can an exhause leak cause the 171 lean condition code to appear? I do have a code for the cat removal, but I know about that and understand the reason for it. This problem is very common on many carbs. This leak will allow air to be pulled into the exhaust and cause a false lean concern at the post O2 sensor. A leak in the exhaust system before the (O2) sensor will also cause incorrect readings. While not often associated with a carburetor problem, an exhaust leak is often overlooked and can lead to off-idle hesitation and deceleration pops. The flames that erupt from the exhaust pipe can even initiate a fire. Vacuum leaks: Have only done a quick vacuum leak test as I have trouble understanding why a vacuum leak would cause a rich condition and if anything a slightly low idle (750rpm) on a MAP engine. Some common causes for this include incorrect fuel pressure, an EGR system malfunction, an MAF sensor malfunction, intake or vacuum leaks, incorrect cam timing, a bad PCV system, or exhaust leaks. Engine Hesitation - What Is It - What Can Cause It - Diagnosing It. Other than hard braking, another symptom is an engine misfire at idle, when we depress the brake pedal. Coolant flush has been on my to-do list and I suspected a possible air leak, or in a worse case a thermometer or water pump issue. CEC system is primarily an emission control system designed to maintain a 14. 1) Clean engine exhaust flange and muffler 2) Use 400grit paper over flat surface (glass/granite) and resurface engine and muffler mounting flanges 3) Use some type of sealant - Loctite510 is what I use 4) Re-assemble - no loctite on bolts Should be leak free for a long time. Other Important P0171 And P0174 Tests. If the mass airflow sensor is causing the lean condition, cleaning it may help, but usually, it will need to be replaced. Maybe a leak in the EGR system. With Cis, a leak before the O2 sensor can indeed cause the car to die. Hot exhaust gases can leak into the cooling system, or coolant can leak into the cylinders and be burned off as steam, either way. Exhaust Leaks. A lean condition will cause it and will also damage the catalytic converter. If any of these conditions are present you most likely will have a cold non-functioning converter emitting too. Running lean in the short term is dangerous depending on how lean. What Does Code P0171 Mean? OBD II fault code P0171 is a generic code that is defined as P0171 – “System Too Lean Bank 1”, and is set when the PCM (Powertrain Control Module) receives input data from the #1 oxygen sensor or air/fuel ratio sensor on bank 1 indicating that the air/fuel mixture has been too lean for an extended period of time- usually about 20. You can test for leaks by performing a smoke test. High fuel pressure can. It'd be a problem if you were leaking between the manifold and turbo though. If it is a cracked exhaust manifold, then yes that may be the problem. I would check the valve stem seals and see what they look like. Readjusted valves checked for vacuum leaks with carb spray around intake. Exhaust system leaks: In this type of condition, the engine may actually be running near stoichiometry (14. Other Important P0171 And P0174 Tests. Rough running engine due to misfiring plugs. In the case of the P2096 OBD2 code, it indicates a lean condition downstream of the catalytic converter. ), the ECM judges the condition as the fuel injection system malfunction and light up the Malfunction Indicator Light (MIL) (2 trip detection logic). Vacuum leaks and exhaust leaks are the more common causes for this type of computer code. Airflow sensor, fuel pressure, or things common to both banks will not trigger a single bank code. Reason - Air leak on the magneto side of the crankshaft seal, too lean carb jetting, ignition timing advanced too far or faulty ignition box, too hot of a spark plug range. This will typically set a separate code. The Pressure Test. Possible Causes for Emission Failure. Clamping off the hoses will reveal if that is the issue. The preturbo exhaust leak will likely cause more afterfire between shifts since it will cause erratic rich than lean conditions. Step 4 - An exhaust leak will allow fresh air to enter the system on the negative pressure side of an exhaust event, this will cause an oxygen sensor to produce a lean reading. More Ford 4. If the downstream O2 sensor has a tendency to stay above center, the PCM will set a low goal voltage which results in a lean fuel mix which can cause the engine to run hotter and aggravate a spark knock condition. Inside the cat all this extra fuel is ignited, causing the cat to overheat. lean to incline: lean on me; thin, skinny, lank, lanky; sparse; economical Not to be confused with: lien – legal claim lean 1 (lēn) v. Can an exhause leak cause the 171 lean condition code to appear? I do have a code for the cat removal, but I know about that and understand the reason for it. purge valve working fine. Routine maintenance helps prevent many smoke related issues but old seals or gaskets and certainly a big crash can cause fluid leaks. A lean condition at higher RPMs but not at idle is an indication of a fuel delivery problem like pump and filter. Open-Source nature of Odoo platform is going to make the most impact in the developing market. This problem is very common on many carbs. Contaminated fuel is another. Ford fuel pressure regulator. Black Exhaust: Black exhaust smoke is an indication of a rich fuel condition. Fuel Pressure could also cause a lean condition. General Q & A - Exhaust leak - My boat has developed an exhaust leak & the RPMs are down. In the case of the P2096 OBD2 code, it indicates a lean condition downstream of the catalytic converter. This is a discussion on Exhaust Leak within the Engine forums, part of the The Performance Tuning Shop category; I have read on this site that if there is a leak in the exhaust at the junction of the manifold and the exhaust port,. What causes exhaust to break. White smoke: Coolant is leaking into the combustion chamber due to head gasket failure; this also causes the oil to turn to "chocolate milk" and can ultimately lead to a blown engine. ), the ECM judges the condition as the fuel injection system malfunction and light up the Malfunction Indicator Light (MIL) (2 trip detection logic). The after-fire is heard on deceleration if the A. A ruptured diaphragm also allows, atmospheric pressure to enter the intake manifold. Diesel exhaust leak symptoms 2015: Update on new injuries since 2013; Diesel exhaust leak symptoms. The preturbo exhaust leak will likely cause more afterfire between shifts since it will cause erratic rich than lean conditions. Exhaust leaks can cause oxygen sensor to send a false lean reading. If it's after the turbo, it won't affect anything. The Possible Causes Of Rich Codes Are: A leaking or faulty fuel. Whether or not thats your problem its worth fixing before it causes bigger problems. They shouldn't test it in that condition, and it will fail with a reason along the lines of "exhaust emissions not tested due to significant leak of exhaust gases from the exhaust system". 7) Exhaust leaks. (Exhaust smell, sooty tailpipe, low mileage, cold weather). So I said ok and got it done for about $30. Try putting some distance between the dryer and air conditioner pipes so that each has its own designated operating room. Fuel Pressure could also cause a lean condition. After installing a new exhaust the expansion and contraction of the metal can loosen up the nuts. To inspect for an exhaust leak, have a helper start the engine and hold the idle at about 1500 rpm, listen for additional exhaust noises. WILLIAMS October 31, 2015 at 3:58 am. Modern O2 sensors are incredibly accurate, sensing the smallest changes in the amount of oxygen in the air. Reason - Air leak on the magneto side of the crankshaft seal, too lean carb jetting, ignition timing advanced too far or faulty ignition box, too hot of a spark plug range. An exhaust stream is actually a series of pulses with high and low pressure zones. if exhaust can go out, air can go in. Routine maintenance helps prevent many smoke related issues but old seals or gaskets and certainly a big crash can cause fluid leaks. Spark plugs that show preignition or detonation damage may indicate a need to check timing, the operation of the cooling system and conditions that cause a lean air/fuel mixture. Consequently, sending this information back to the engine computer; for emissions control and fuel-metering decisions. A vacuum leak is caused by extra air introduced into the fuel/air mix produced by the carburetors, which will lean out the mixture and cause poor running conditions. System Too Lean P0171 P0174 Vacuum Leak Quick Test Ford 5 4 Lean Condition Diagnosis on Ford p0171 P0174 Watch some. A leaking exhaust will not cause low compression. Bad or Lazy (80,000 + Miles) Upstream O2 Sensor. Inside the cat all this extra fuel is ignited, causing the cat to overheat. Check the manifold vacuum with a vacuum gauge. Vacuum leaks: Have only done a quick vacuum leak test as I have trouble understanding why a vacuum leak would cause a rich condition and if anything a slightly low idle (750rpm) on a MAP engine. When DTCs P0133 and P0153 are set at the same time, it is a good indication that a fuel contamination condition is present. This condition will cause the exhaust gas mixture to be lean, even though. If you notice a very strong exhaust smell in the car then you probably have a leak in the exhaust. If it comes back again, then check your o2 sensor conenctions and make sure they are clean and good. I attributed it to unburned gases in the exhaust igniting on decelleration and jetting wont help that. If there are no intake leaks, the next step is to replaced the air filter and clean the air flow meter. Induction and exhaust system leaks are the most probable cause for the manifold pressure to drop in climb. Could it be so that case center gasket starts to leak only when engine is hot or under load? Could carbonized exhaust cause lean condition for the engine?(expansion chamber should be clean and silencer wools are recently changed) Im starting to get desperated cos there is no good reason for the engine to run so lean. All things being the same in each cylinder, the one with any significant exhaust leak would show lean because the leak affects that illusive back pressure in the pipe. Absolutely, a leaking exhaust manifold can cause those codes. If this is not possible, then there is cause to suspect leakage. Engine/muffler leak will affect engine running (rich/lean condition). You could spray some TB cleaner around your vacuum lines and it will cause a higher idle wherever there is a vacuum leak. I am under the impression that exhaust leaks usually make you run rich, as most lose gas mileage when you get one. As the operating condition gets leaner, the spark plug provides the same amount of energy -- but it is still enough energy to ignite. Routine maintenance helps prevent many smoke related issues but old seals or gaskets and certainly a big crash can cause fluid leaks. Check the wiring to the bank 2 upstream O2 sensor. There appears to be a slight exhaust leak at the exhaust manifold. Visit Edmunds. The Pressure Test. If water finds a way into the gas-only chamber before the end of the riser because of a leak in the water-jacket, it can seep into the cylinders when the engine is at rest and either seize the pistons with rust, or create a "hydro-lock" condition. Hemming the roof edges. I've seen exhaust valves that got hot and lost temper & stretched, seen 'em that apparently work-hardened from heating/cooling cycles and shattered, and seen 'em that just plain melted. These codes are set by the car’s computer when it sees too much oxygen in the exhaust. Routine maintenance helps prevent many smoke related issues but old seals or gaskets and certainly a big crash can cause fluid leaks. A MAF intake hose has a visible crack upstream of the MAF sensor. P0174 indicates that the fuel control portion of the engine's computer is correcting for an excessively lean air/fuel mixture. It appears that a car running rich or lean is the two sides of the same coin. Our Universal, Direct-fit, CARB, High Performance and Diesel converter lines cover over 100,000 applications, including OBDII coverage for all 50 states and are certified in 58 countries around the world. Sometimes a service technician will reset the PCM and take it for a test drive. The cat will eventually break apart internally clogging the exhaust system. A leaking tailpipe won’t usually cause any noticeable noise, but it’s still a problem. If I remember correctly (this was about 10 years ago), the car just didn't want to run smooth. When DTCs P0133 and P0153 are set at the same time, it is a good indication that a fuel contamination condition is present. Other possible causes of blue exhaust smoke include: piston wear, worn valve seals, a dirty or non-functioning PCV valve, worn piston rings, an intake manifold gasket leak, worn engine oil seals and possibly even head gasket failure. yes, we have ways to determine what is the root cause. This fault is both common and a clear indication of a sticky HO 2 S. I finally took my car to the shop to repair a lean condition causing very rough idle and poor acceleration. if exhaust can go out, air can go in. Over time, the fumes leaking from a cracked exhaust pipe will damage surrounding components, and could even cause a fire. To eliminate your intake leaks, simply attach this Intake Leak Pressure Tester to your turbo inlet and apply compressed air through the standard tire. An external leak is the type of leak which is most easily diagnosed. You should get a bung put in the collector of the header tube for the wideband so theres little chance of a leak affecting it. Stuck open PCV Valve. On your '95, do you have oxygen sensors? If so, an exhaust leak upstream of the O2 sensors I believe makes the sensors think there's a lean condition so it causes the engine to run richer- this would mean worse fuel economy and worse emissions. What Does Code P0171 Mean? OBD II fault code P0171 is a generic code that is defined as P0171 – “System Too Lean Bank 1”, and is set when the PCM (Powertrain Control Module) receives input data from the #1 oxygen sensor or air/fuel ratio sensor on bank 1 indicating that the air/fuel mixture has been too lean for an extended period of time- usually about 20. Air leaks are, by far, the number one cause of vintage engine piston seizures. Ford TSB 04-17-4 details procedures for checking fuel trim and looking for vacuum leaks. Unfortunately, when we have a rich or lean condition, we usually look for external engine problems first. Set the ignition timing to specifications. If it comes back again, then check your o2 sensor conenctions and make sure they are clean and good. Lean running conditions are often the result of leaks. You could spray some TB cleaner around your vacuum lines and it will cause a higher idle wherever there is a vacuum leak. Checked compression and all but #5 were ~ 160. Other things that can cause it are exhaust leaks - not really a lean condition, just a false reading - whoops saw you fixed that Check for air leaks in any intake piping between the MAF and TB. Well, I have a really unstable mixture at idle (mostly lean) and am wondering if an exhaust leak can cause this and also the hesitation that occurs at about 1000 rpm every time I start to accelerate. This causes a backflow of exhaust gases into the cylinder from the exhaust system. Running lean in the short term is dangerous depending on how lean. This leak could be from a vacuum hose or the intake manifold gasket, for instance. Internal cooling system leaks can destroy a catalytic converter. Typical causes for this code include: 1) O2 sensor defective or lead shorted 2) Lean injectors (dirty or blocked) 3) Water in fuel 4) Exhaust leaks upstream of O2 sensor 5) Fuel pressure or volume too low 6) MAF sensor reading lower airflow than is actually present 7) Vacuum leaks 8) Incorrect or poorly calibrated PROM in the ECM Return to Chart. More Ford 4. So if 100% that int and exh sensors are good and correct then recheck pipes and tubes near throttle body like the evap solenoid circuit. For Rich O2 Sensor Readings. Possible Causes: Refer to our Oxygen Sensor Code Diagnosis article for a list of all possible causes. (0=lean, 1=rich) NOTE: Do not trust the O2 sensor output unless the engine RPM is steady. The upstream HO 2. An engine with bad rings will also show signs of power loss, especially when going up hills. If a car has a check engine light on and has P0171 and P0174 codes stored, the most likely cause is a vacuum leak. A lean mixture will misfire, causing unburned fuel to enter the cat. If the timing chain and guides are worn, replace the water pump as well. The internal cylinder condition is just as important, […]. Lean code P0171, but the engine is running very rich. It was used in Japan on Toyota Carina T150 replacing the TTC-V (Vortex) exhaust gas recirculation approach used earlier, Toyota Corolla E80 , and Toyota Sprinter. The high pressure po. This condition is caused by oxygen-rich air entering the exhaust system through an external source. The flame front can then travel up the intake and cause a backfire. A leaking exhaust will not cause low compression. Its a very slow oil leak, but its enough to keep that seam washed clean. To check for vacuum leaks, ask someone to start the engine and hold the idle for you at. I know an intake leak or vacuum leak can cause a lean condition. Excessive oxygen readings in the exhaust will set lean codes. Atmospheric pressure lowers the engine vacuum, by leaking through the diaphragm. Whatever the cause, high HC-only emissions usually indicates a lean misfire, an ignition failure or an engine mechanical problem. Carburetor jetting: An overly-lean low-speed circuit, non-functioning accelerator pump or clogged pilot jet can contribute to backfiring. California emissions. If the P0171 Volvo is combined with the P0174 Volvo code, it’s very likely that the problem is caused by an intake leak. An intake leak would certainly give you lean condition symptoms. The following is an overview of P0171 check engine light code possible causes. The pressure test Seal off the intake port and the exhaust port with pieces of rubber that are cut to the profiles of the gaskets. Typical causes of lean conditions range from a bad vacuum line, faulty sensor, broken engine gasket to a cracked cylinder head, faulty intake plenum, warped throttle body, and too much more to. An exhaust leak will cause the O2 sensors to go whacky. As the operating condition gets leaner, the spark plug provides the same amount of energy -- but it is still enough energy to ignite. A leak in the exhaust system before the O2 sensor will also cause incorrect readings. Lean mixtures which cause misfires will damage the cat. A lean condition at idle only, and not higher RPMs is a possible indication of a vacuum leak. 7:1 air/fuel ratio), but the exhaust gas mixture will be lean. It appears that a car running rich or lean is the two sides of the same coin. Basically this means that an oxygen sensor in bank 1 has detected a lean condition (too much oxygen in the exhaust). now both cylinders have a very small exhaust leak and it is running lean. Sorry if I wasn't clear. Then I popped a P0171 lean code this morning and I'm wondering to what extent they might be related or if it's just a coincidence. ), but the blown head gasket can also cause the engine to overheat. the best way i find exhaust leaks and see how severe they are is by seafoaming the engine through the brake booster vac line. Clamping off the hoses will reveal if that is the issue.
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