Help, SES "lean"
Thread Starter
Launching!
Joined: Oct 2002
Posts: 286
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From: OHIO
Help, SES "lean" Ok I am getting an SES that says lean in both banks that comes and goes even after the long tubes and o/r y. Auto Zones said it was the O2s the 4th time I had it cleared. It will come on and then go away sometimes! I put on hte stock maf and cannot figure it out. Any ideas out there, its been doing this for 5 months now? 
Most of the time you can hear air leaks.The common one is around the fitting for the EGR tube in the intake.Just start the car and spray WD-40 or carb cleaner on the intake at the tube.Idle will change if there is a leak.Check all pieces from the Mass air to Throttle body too.Any leak there will do it.
A MAFT can add fuel fixing a "lean condition"
Also if there is any exhaust leaks from the headers to the Y-pipe,that can pull fresh air across the 02's causing lean.
A MAFT can add fuel fixing a "lean condition"
Also if there is any exhaust leaks from the headers to the Y-pipe,that can pull fresh air across the 02's causing lean.
I threw lean codes and misfire codes (from fouled out plugs) when I put my headers on running them open for the weekend. I also went through 2 sets of plugs while my stft's were showing +55'ish.
Once I got the exhaust welded up, all was smooth. Fresh air on the o2's will make the pcm go crazy ...
Once I got the exhaust welded up, all was smooth. Fresh air on the o2's will make the pcm go crazy ...
