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Re: GM rear fuel trim
Posted to Technical Discussion Forum on 2/14/2009 6 Replies

Dave,, here is some scan data from an 05 GMC envoy with the front 02 sensor not working. The vehicle runs great, stays in fuel control, with no drivability problems. The system is trimming from the rear sensor, everything is happy. [2005 GMC Envoy XL, ECM/Inpu... Login to read more.

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