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Old 06-14-2011, 08:05 AM   #21
OldNuc
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1998 SC2
Default Re: P0304 cyl 4 misfire detected

Change the coils and if you also picked up An ICM change that also. As there is only #4 that is misfiring this is either an ignition or injector problem. Plug wires could also be the cause. If they are not new change those also.
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Old 06-14-2011, 01:20 PM   #22
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Default Re: P0304 cyl 4 misfire detected

Ok. I picked up the 2 coils, the ICM, and new plug wires so i'll change it all. BTW the compression looks ok right ? Thanx
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Old 06-14-2011, 02:34 PM   #23
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Default Re: P0304 cyl 4 misfire detected

Compression looks good and the first 3 plugs are good and #4 is only slightly cold from misfires.
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