Question about 2000 Pontiac Sunfire

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Misfire I have a 2000 pontiac sunfire that has been having a misfire in cylinder 2. I have changed the spark plugs, wires and the coil pack and still has the same problem. What do you suggest I do now?

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Check to make sure the fuel injector is working on that cylinder, check the connector to the injector for a loose or damaged pin, get a NOID tester from a parts store and see if the injector flashes the NOID light while the engine is running or cranking.

Posted on Oct 13, 2008

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To diagnose a misfire in one cylinder, well, you start at that cylinder. It could be ignition related- the spark plug and spark plug wire for #6, possibly the ignition coil for #6 in the coil pack for the engine. (A v-6 would have 3 coils in the coil pack, one coil for 2 cylinders.) It could also be fuel related, so the fuel injector for cylinder 6 should be considered. And the last reason for a misfire is usually the most expensive repair: low compression in #6. This may be a head gasket problem, or a piston ring problem, or one of the valves for #6 may not be sealing well, causing low compression and the resultant misfire. The engine computer codes a misfire when it senses low power output from that particular cylinder. The misfire causes a lag in crankshaft rotation, and the crankshaft position sensor senses it.

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Keeping it simple...I'd go with the spark plug first and then look at the condition of the wires.

Hope this helps...

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Hello Mr Fixit...If memory serves me right, the PO352 B fault code would indicate #4 cylinder coil and PO352 A for #3. The
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