Any common reason that an engine would start running a lean gas mixture? 97 2.8 qm

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12-29-2006, 07:30 AM

97A4_UT

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Any common reason that an engine would start running a lean gas mixture? 97 2.8 qm

Hey guys:
My CEL kicked on the other day and when I had it checked it said something like "fuel system failure" and "engine running lean". What does this mean?
Also, could I cause any serious harm to the car by driving it in this condition for a little while?
Some info: I've had some problems with my idle for a little while. When I was about to remove the ICV to clean it (recommended for bouncing idle) I noticed one of vacuum lines was completely dry rotted and it has been replaced. (I think they all need replacing though). Any relation to the CEL? Thanks!

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12-29-2006, 07:33 AM

Nate (ETKA+Scumbag)

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If you have either of the code number, punch them into search and see what it coems up with

More than likely your precat O<sup>2</sup> sensor is dead.

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12-29-2006, 09:12 AM

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I would find someone near you that can VAG the car and then post the codes

however if you are running lean it could be your pre-cat O2 sensor or your MAF.

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12-30-2006, 10:43 AM

kalpesh

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I have a a4 99 1.8T mine did the same thing with the same code, apprently

there was a little hose on the stock airbox that was cracked. it was a Y shapped looking peice with a little filter preventing blow back from the turbo was gone, replaced those two parts ($30) and code gone!