Cylinder 3 misfire on my 2002 Pontiac Grand Prix Gt

Asked by Sep 23, 2017 at 06:07 PM about the 2002 Pontiac Grand Prix GT

Question type: Maintenance & Repair

I keep having a cylinder 3misfire I've changed all
the coil packs, spark plugs&wires, maf sensor, map
sensor, egr valve, as well as Icm. Is it anything else
I can check out?

1 Answer


How is old is the valve cover gasket? I would also perform a cylinder pressure test to determine if there is a worn valve or piston.

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