Mechanics

MISFIRING ON STARTUP

1996 Chevrolet Corsica • 250,000 miles

1996 chevy corsica misfires on start up and idle but runs fine at higher speed
i have done a complete tune up and replaced egr valve. Nothing helps, engine code says misfire cylinder 3. All tests show #3 running fine. Only have misfiring on start up and a very crappy idle
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Laure123
September 18, 2011.



I would check compression next. Let me know what it is and I can help you more.
If the compression is low it can cause a misfire.

Promechanic
Sep 18, 2011.