Question about 2008 Chevrolet Malibu Classic

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I had the check engine light come on, so I went by Autozone to have the code reacompd. The result was a cylinder 1 misfire. I then cleared the codes. The light came back on in a few miles. So I changed the spark plugs and put in a can of Sea Foam in the fuel tank. I cleared the codes. Light came back on again. I'm thinking it is a coil pack. Do coil packs work intermediately or just quit working? I unpluged the pig tail to the #1 cylinder (closest to the right/passenger side) and could tell a little difference in the idle. Any suggestions??

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Yes you can have an "internitent" spark issue, because some misfires only happen under a specific condition, rpm, load, fuel trim. so first things first you have to find out what is cuasing the misfire, GM cars use a 3 pack coil system, and for the most part when you have a misfire on one cylinder you get it on 2 becuase each coil fires 2 times in the engine rotation, so you should pull the coil and check it with an Ohms on each post, now pull another coil pack and check that one agaist the other,then do this one more time with the last, this will give you a good idea, not foul proof though, of weather you have a bed coil before you go buy one, so lets assume that its not the coil pack, check your wire with a KV test, barrow one from autozone, the higher the Kv the faster the spark is going to ground, this will tell you if you have a bad wire / plug, refference it with the rest of the wires, very low Kv cirut is open or has a high resistance, very high Kv, shorted to ground. if it is non of the above then you are looking at replacing a controler that is under the coil packs, this can be tested with about a $6,000 osiliscope, but since you probly don't have one in your garage, better just test everything else and if that all passes just go buy a control moduel. Happy hunting...
Test, retest, and test again, Don't waste money parts swapping.

Posted on Sep 27, 2011

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