Question about 1999 Ford Escort

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Running Lean Car is running lean. We replaced cracked exhaust Manifold

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If the engine is still running lean, I would replace the Oxy sensor (s),
Then check for a vaccum leak, I found a very large leak on my intake manifold... there is a cap on a nipple on the engine side lower intake manifold (very difficult to get to) and I could not see it until I removed the intake and looked at it.
On my engine, this cap made of rubber was rotten and leaking vaccum.

This helped me 100%

Posted on Oct 23, 2008

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Installed new TD04 turbo and vehicle ran perfect for a week or so. Last night drove 10 mins it is revving to fast and when i looked at exhaust manifold it was glowing red.


I would check your MAP or MAF sensor to be sure. Sounds like you are running lean which is causing your exhaust gas temperature (EGT) to be very high. Running lean with a turbocharged car will destroy your engine very quickly. Drive the car gently until you figure this out.
P0109 OBD II Trouble Code

Also, it is common for the exhaust manifold and downpipe to glow orange if the car has been driven in a spirited manner. Although, normal (not lead foot) driving shouldn't cause your EGTs to be this high.

Mar 21, 2016 | 2002 Saab 9-3 SE

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1983 f150 with 351 windsor. Recent problem of bogging down when climbing moderate hills. Also sounds of ticking noise, lifters or manifolds leak? Any help much appreciated.


A leaking exhaust manifold could make a ticking noise. So could a lifter or valve. The exhaust noise would be louder under load.
If the carb is running too lean, or you have a vac leak, the lean fuel mixture could make the exhaust leak worse, and cause the loss of power.

Dec 19, 2012 | 1983 Ford F150

1 Answer

2005 cherokee 3.7 runnig laen


Cracked exhaust manifold. with engine off, on a cool motor, put a shop vac in reverse up the tail pipe. this low pressure will show any leaks in the exhaust. Use soap and water to spray the exhaust manifold. Any crack will draw air and cause the engine to run lean

Sep 18, 2012 | 2005 Jeep Grand Cherokee

2 Answers

What is a code 51


Is refer at O2 sensor, Code 51 - Oxygen sensor output indicates lean too long

Power loss light: Off
Limp-in mode: Engine allowed to run rich, but prevented from running lean

Possible Causes
Bad oxygen sensor - Replace the sensor which is located on the turbo housing near the down pipe (for turbo) or on the down pipe near the exhaust manifold.

Bad connection or wiring - Check the wiring and connections between the sensor and the logic module (or SMEC). Clean and regrease any corroded connectors with dielectric grease and repair any shorts. Look for melted wire insulation near the exhaust manifold. A shorted connection to ground or any positive source will cause this fault code.

Low fuel rail pressure - See the Diagnosing Your Fuel System page.

Diagnostic Method - Trigger Parameters
- In closed-loop
- Sensor output indicates lean for more than 715 seconds (11 minutes, 55 seconds)

Results If Component Fails
A fault code 51 is stored, the circuit stays in closed-loop, and the logic module will still monitor the oxygen sensor signal. If the condition persists for four times what it took to set the code, the logic module will allow the engine to run rich, but prevent it from running lean.

Hope helps.

Mar 28, 2011 | 1996 Dodge Intrepid

1 Answer

Engine light came on took it to auto shop. they said it was a code 51


Fault Code 51 - Oxygen sensor output indicates lean too long

Power loss light: Off
Limp-in mode: Engine allowed to run rich, but prevented from running lean

Possible Causes
Bad oxygen sensor - Replace the sensor which is located on the turbo housing near the down pipe (for turbo) or on the down pipe near the exhaust manifold.

Bad connection or wiring - Check the wiring and connections between the sensor and the logic module (or SMEC). Clean and regrease any corroded connectors with dielectric grease and repair any shorts. Look for melted wire insulation near the exhaust manifold. A shorted connection to ground or any positive source will cause this fault code.

Low fuel rail pressure - See the Diagnosing Your Fuel System page.

Diagnostic Method - Trigger Parameters
- In closed-loop
- Sensor output indicates lean for more than 715 seconds (11 minutes, 55 seconds)

Results If Component Fails
A fault code 51 is stored, the circuit stays in closed-loop, and the logic module will still monitor the oxygen sensor signal. If the condition persists for four times what it took to set the code, the logic module will allow the engine to run rich, but prevent it from running lean.

Hope helps.

Mar 28, 2011 | 1996 Dodge Intrepid

1 Answer

My car is 2007 jeep srt8 i have check engine light and error code p0171 and i notice a discreet gas while i was driving. what this kind of error will be?


Fault code P0171 (Bank 1 system to lean) indicates that the engine is running to lean. The gas smell you can notice is the engine trying to richen its mixture up. A quick try at fixing this is to remove and clean the MAF (mass air flow sensor). This would be located somewhere in the intake manifold or intake piping. Once clean (use electronics cleaner) let dry and re-fit. start engine and see if fault clears. Also check for broken/cracked exhaust and inlet manifolds, leaking manifold gaskets and any vacuum hose cracked/perished or fallen off.

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91 Camaro RS V6 - Brand new O2 sensor running lean


Did you clear the code first after replacing and did you replace the spark plugs. If the plugs are fouled the cylinders arnt firing and the excess air is going over the 02 sensor and since it PCM cant command enough fuel it stays lean.

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1 Answer

How do i adjust the rich/lean fuel mixture cracked intake


You can't do it with out a tech 2 scanner, so your going to have to go back to the Mechanic to have it reprogrammed. As long as it's running rich, your going to have bad fuel economy and will not pass the emission test when you have to have it done. Good luck and glad to know you got your car running almost 100%

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3 Answers

Engine code p0171 right bank running to lean


This sounds like an O2 sensor, there are 4 O2 sensors, 2 for each bank, 2 up stream by the exhaust manifold and 2 down stream by the catalytic converter. However the information you have given is limited, the explanation for the code seems to be missing some information. Ex: right bank sensor 1 to lean.

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