Hummer H3: Replacing Ignition Coils & Spark Plugs
2006 Hummer H3 3.5L, 5 cylinder, Base. Error Code reads: Code P0304 indicated that cylinder 4 had too many misfires within a predetermined period of time. Here is a video on how to fix this problem and never worry about it again. Instead of just fixing that particular cylinder, I went ahead and just fixed all the cylinders at once. From the spark plugs to the ignition coils, everything is in one spot making it easy to replace.
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Hummer H3: Ignition Coil diagnosis
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