Quote:
Originally Posted by roosterk0031
My Cobalt fuel trim had been maxing out off and on for over a year before I finally figured it out. Evap Purge valve was creating a vacuum leak. My code was always a lean code, don't remember the number, even though it was running crazy rich. Got the first replacement part from O' store worked a few months. ACDelco part been working 5 months now.
Tahoe & Cobalt even have the same part number.
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it's the MAF/IAT combo
the IAT is showing 20-30 degrees higher on a stone cold start.. the MAF might be incorrect as well as it back fired a few times as well
I run chevron fuel
the MAF/IAT sensors are a common failure
sometimes it cranks too long and goes to 1500-2000rpm(with it's obnoxiously HUGE Electrical 60,000 watt starter)