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International Automotive Technicians Network
Re: 2002 Yukon XL P0174, P0171
Posted to Technical Discussion Forum on 1/25/2006

[...trimmed text...]

I'd look at the IAC counts at idle as Mr. Phelps mentioned then I'd road testit and watch fuel trim to see if the lean condition showed up anywhere other than at idle.

Can ya plot fuel trims, VSS, l... Login to read more.