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Re: What can make an engine run rich but the ECM detects lean
Posted to Technical Discussion Forum on 11/22/2009

Given you've replaced the 0'2s and they are working I'd reset trims and see what happens under accleration. Does stft mirror load and maf under hard accleration? If so I'd look closely at the maf. This is providing your sure there is no false air. Login to read more.