Mechanics

2.2 ECOTEC. IT HAS CYLINDER 4 MISFIRE.

2002 Chevrolet Cavalier • 85,500 miles

2002 cavalier 2.2 ecotec. It has cylinder 4 msfire. Ihave changed spark plugs wires icm ignition coil and fuel injectors with no change. Did compression test and cylinder 1-3 210 psi and cylinder 4 190 psi. What could my problem be?
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02cavwithissues
August 13, 2012.



Remove the valve cover and make sure the pushrods and rocker arm is moving.

Roy

ASEMaster6371
Aug 13, 2012.
I did remove valve cover and rocker arms are moving. Time chain is correct tensioner is good.

Tiny
02cavwithissues
Aug 13, 2012.
Re check the compression for that cylinder. Is there any noise from the valve train while running?

Does the plug spark?

Roy

ASEMaster6371
Aug 13, 2012.
Yes sounds like valve clatter when under load. I did check compression cylinders 1-3 had 210 psi and cylinder had 190 psi cylinder 4 is the one I am having issues with. Yes it has spark and fuel.

Tiny
02cavwithissues
Aug 13, 2012.
The noise may the valve moving in the guide causing the miss.

Roy

ASEMaster6371
Aug 13, 2012.