2008 Chevy Impala 3.5 Hard Starting When Cold

montego_gto

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Jan 12, 2009
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Dropped the car off at the local GM dealership Monday after checking everything over myself along with the advice of you guys.
The only thing I could find was that the alcohol percentage on my code reader would still hover around the 74% mark while I still run only ethanol-free fuel. (The last tank was only 220 miles.)
Dealership mechanic “reset the engine control module, reset alcohol percentage readout to zero, and reran the idle calibration procedure.”
After 7 cold starts, it starts like it is brand again. Alcohol percentage has been a steady 1.2% over the last 125 miles. I’m on pace for 350 miles for this tank.
just wanted to follow up with you guys.
Thanks for the help.
Nick in WI
 
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