Question about 2002 Chevrolet Avalanche

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Miss on cold start up

02 chv avalanche 8.1 coil on plug, missfire on cold startup goes away after warm up and shows sometimes under heavy load, injectors, plugs, wires have been replaced, fuel pressure good.

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Have you checked the oxygen sensor? If the engine is running lean, then it would behave the same as you described. Those sensors should be replaced every 80K or so.

Posted on Sep 05, 2008

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Hi ,
Imbalance of engine at idle can be caused due to many reasons..

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3: Cylinder head
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