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Re: 2005 C240 negative fuel trims
Posted to Technical Discussion Forum on 4/26/2017

[...trimmed text...]

I think you need to reset the Ethanol Correction Factor to 1.0

I converted 37.65 KPA to 18.8 inches of engine vacuum

[2003 Mercedes-Benz C32 AMG, ECM/Inputs/Outputs Waveform]

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