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06-05-2008, 03:07 PM | #1 | |
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Join Date: Jun 2008
Location: Glendale, Arizona
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99 GA 3.4 Misfire - HELP!
I have a 99 GA with 3.4 V-6 SFI. When I bought this it had a small misfire that I assumed would clear up with new plugs, wires, etc. System never threw a code but you could a stumble anytime you tapped fuel.
I put new Autolite Platinums, new 7mm wires, checked all connections, ohm tested all wires, put injector cleaner through system, etc. After this system starts throwing a Cylinder 4 misfire code, go through again and check everything, clear code, stumble still there, new code Cyl 1 misfire, find I had cracked plug at Cyl 1. Replace with new, check all connections, another Cyl 1 misfire code, so I replace the 1-4 coil. Still misfires, check all connections, nothing obviously wrong. So I put an 'Ignition Spark Checker' (noid light?) in the spark plug wire and find a random bright spark among consistent low level sparks. I put this light in all other spark plug wires and the spark is nice and bright with no misfires or off beat bright spots. I can smell excess fuel in the exhaust, but I have checked the fuel injector wiring and they all appear intact. Due to the random bright sparks I am still looking in the electrical department. This morning the CEL shows a random misfire code. I took the ICM out and had the local store check it and they tell me that they ran 4 different tests and the ICM checks out OK. They said the ICM was even hot when they ran them and it never failed. What gives? What am I missing? |
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06-05-2008, 11:41 PM | #2 | |
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Join Date: Jun 2008
Location: Glendale, Arizona
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Re: 99 GA 3.4 Misfire - HELP!
Well you won't believe this but I sorted it out.
Turns out I had accidentally mislabeled wires 4 and 6.!!!!!!!!!!! What an idiot! Now it runs like a top! Thanks for taking the time to read this. |
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