Random misfire
5

Asked by Jirjirak Dec 19, 2019 at 06:27 PM about the 2004 Chevrolet Avalanche 1500 RWD

Question type: Maintenance & Repair

I’ve got a random misfire on my Chevy
avalanche Cylinder #5  has got 9000 misfire
cylinder #4 has 7000 misfire in the diagnosis
but they checked the spark plugs wires
injectors coils Compression and everything
else and was diagnosed by the dealer and
they couldn’t find the problem either !

Tire Plus tells me that it is the ECM that is
causing the problem you cannot can anybody
help me and tell me if that could cause the
this random misfire .
It’s become a huge problem and I really I
would appreciate any and all help I can get.
thank you in advance

1 Answer
18,265

munron answered 4 years ago

On older vehicles cleaning and tightening electrical connections, including grounds is often a good way to clear up problems like this. If you're not up to the task, find a shop that specializes in auto electrical diagnosis and repairs. I have a tech who always looks for this sort of thing first and he is usually able to at least improve things without actually changing parts. Your results may vary.

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