Re: Excessive Fuel Trim (Extreme Negative Values)

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Posted to Technical Theory Forum on 11/15/2025

Since I failed miserably on my first try. Got a look at your scans. Look at this around 2950.

[2016 Chevrolet Malibu LT, ECM/Inputs/Outputs Document]

Looks like you jabbed the throttle a bit. Timing jumped like 40 degrees! RPM jumped before throttle even mo... Login to read more.

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