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Re: 2004 Yukon Denali EVAP.What Code is This?
Posted to Technical Discussion Forum on 9/3/2007 6 Replies

Ok Robert I have an answer for you now. And only because I have seen it before.

The ECM has a code set which is disabling the fuel trim monitors. (EVAP flow during non purge) However it doesn't stop the ECM from attempting to control the fuel mixture for bet... Login to read more.

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