MISFIRING ON STARTUP

1996 Chevrolet Corsica

Tiny

laure123

September, 18, 2011 AT 10:31 PM

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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Tiny

promechanic

September, 18, 2011 AT 10:48 PM

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.

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