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International Automotive Technicians Network
Re: P0171 at idle and off idle
Posted to Technical Discussion Forum on 3/17/2014

hey Harvey

here is the .tse file, fuel quality, that explains the fuel trims being correct when the vehicle was finished and given to him.

then he goes and gets cheap gas, now the fuel trims go positive. not as far as they were before, but positive.

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Files Referenced:

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