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Old 07-18-2006, 09:36 AM   #1
Tofm
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Easy to change a coil pack?

My mechanic told me that my misfire problem is due to a bad coil pack. I heard that the part is pretty cheap so I'm thinking about just replacing it myself to save some green. Are there any instructions on how to replace it? Is it simple?
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Old 07-18-2006, 09:48 AM   #2
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more info about ur car would be helpful and what exactly is the car doing? any mods recently done?
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Old 07-18-2006, 10:04 AM   #3
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Quote:
Originally Posted by Ar6entino
more info about ur car would be helpful and what exactly is the car doing? any mods recently done?
2002 GXE, I'm getting a misfire (P0304) according to OBD. Car is completely stock. No smoke coming from exhaust.
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Old 07-18-2006, 10:14 AM   #4
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P0304 CYL 4 MISFIRE

Could also be headgasket but you have no smoke coming out, not sure. If the coil pack is cheap, you could try that.
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Old 07-18-2006, 10:23 AM   #5
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Simple as pie. Just look it over and use good, common sense. Cylinder four is the one on the drivers side of the car. Get it fixed asap. You can overwork your cat and ruin it. Theres a small chance a bad injector will throw the same code. Change your oil after the fix to rid the engine of any fuel dilution.
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Old 07-18-2006, 10:34 AM   #6
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Perfect, thanks for the tips.
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Old 07-18-2006, 01:21 PM   #7
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Would it be easier it you just switch coil packs with another one of the cylinders and see if the code switches to the other cylinder? If the code switches to the other cylinder then you know it is the coil pack. Also pull the spark plug on 4 and see what it looks like.
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Old 07-18-2006, 01:26 PM   #8
Ar6entino
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Quote:
Originally Posted by jcrow
Would it be easier it you just switch coil packs with another one of the cylinders and see if the code switches to the other cylinder? If the code switches to the other cylinder then you know it is the coil pack. Also pull the spark plug on 4 and see what it looks like.
Thats a great idea
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Old 07-18-2006, 01:38 PM   #9
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Quote:
Originally Posted by jcrow
Would it be easier it you just switch coil packs with another one of the cylinders and see if the code switches to the other cylinder? If the code switches to the other cylinder then you know it is the coil pack. Also pull the spark plug on 4 and see what it looks like.
I pulled the plug, other then a little soot it looked normal (Not dented or anything), although the other plugs were a little cleaner I'm guessing this is because of the misfiring? I haven't tried switching the packs, I will later tonight, thanks for the tip.
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Old 07-18-2006, 09:50 PM   #10
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Might be the injector, happend to me about 3 years ago.
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Old 07-18-2006, 11:33 PM   #11
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I had the same problem but it turned out to be Cyl 2.

Coil pack is easy as heck to replace , so definately do it yourself.

as once370 wrote, avoid driving it with the misfire because it WILL damage your cat. I was forced to drive about 60 miles with the misfire and now I've got a constant p0420 code (cat below efficiency threshold). The added raw fuel might also contribute to fouling of your O2 sensors which will cause additional problems.

my new coil pack cost about $65 I beleive.
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Old 07-19-2006, 01:23 AM   #12
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Quote:
Originally Posted by GREEN01GXE
I had the same problem but it turned out to be Cyl 2.

Coil pack is easy as heck to replace , so definately do it yourself.

as once370 wrote, avoid driving it with the misfire because it WILL damage your cat. I was forced to drive about 60 miles with the misfire and now I've got a constant p0420 code (cat below efficiency threshold). The added raw fuel might also contribute to fouling of your O2 sensors which will cause additional problems.

my new coil pack cost about $65 I beleive.
I just ordered my coil pack .....it was 70 bux, plus another 80 for the valve cover i needed.....im installing them tomorrow. I had oil in my spark plug...couldnt even see the plug..did a nice tune up!
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