Anyone come accross this situation: both a rich and a lean fault stored at the same time. MIL on,
03-10-2006, 09:26 AM
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Anyone come accross this situation: both a rich and a lean fault stored at the same time. MIL on,
FT: -8 and +24. All obvious components checked/replaced. After clearing faults, all readiness codes set easily. Drive for 50 miles or so, and the faults return. I'm at a loss. Thanks for your help.
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03-10-2006, 04:29 PM
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I had similar experience... I don't think it's the same thing, but just in case.
After 20 hours of serious work, assembling and disassembling the heads 4 times, we found out the problem to be a partially defective cam chain tensioner.
The car was fast... motor sound was a little bit more agressive (deeper note) than normal at WOT but nothing to scare me. Monitoring the car with VAGCOM, I could see the fuel trim going in opposite directions in real time (rich and lean code at the same time depending on channels) until it would reached 20% where I would get an automatic CEL (a flashing CEL that is for 10 seconds, ... and normal CEL afterwards).
Q: Are both banks showing the same amount of fuel trim correction?
Q: What codes to you get in VAGCOM, if any?
Q: Have you changed your timing belt recently?
Best of luck finding your problem...
The car was fast... motor sound was a little bit more agressive (deeper note) than normal at WOT but nothing to scare me. Monitoring the car with VAGCOM, I could see the fuel trim going in opposite directions in real time (rich and lean code at the same time depending on channels) until it would reached 20% where I would get an automatic CEL (a flashing CEL that is for 10 seconds, ... and normal CEL afterwards).
Q: Are both banks showing the same amount of fuel trim correction?
Q: What codes to you get in VAGCOM, if any?
Q: Have you changed your timing belt recently?
Best of luck finding your problem...
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