Misfire code wont go away. P0302 - Chevy Colorado & GMC Canyon

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Old 01-30-2010, 03:15 PM   #1 (permalink)
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Default Misfire code wont go away. P0302

2005 3.5L Ok, so for a long time I was getting the p0302 code. Thanks to help from people on here I was able to find out that the head needs to be swapped out, and the best part...GM pays for it. After being jerked around from the dealership I bought the truck from, they finally let me bring it in to be fixed. Two days later, I once again got the same trouble code and it ran like crap. I went to another dealership and I was told it may be because I have Bosch 2's in it, not the stock AC Delco plugs. Does this sound right to anyone??? Any help will be greatly appreciated. Thanks.
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Old 01-30-2010, 06:32 PM   #2 (permalink)
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Default Re: Misfire code wont go away. P0302

use ac delco plugs. Bosch or those retarded e4 at the az will make your truck runs like a lawn mower.
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Old 01-31-2010, 06:36 AM   #3 (permalink)
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Default Re: Misfire code wont go away. P0302

Thanks for the help. I put ac delco plugs in it today and it did not fix it. Im goin to take it to another chevy dealership and see what they have to say.
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Old 01-31-2010, 05:45 PM   #4 (permalink)
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Default Re: Misfire code wont go away. P0302

AC Delco plugs are crap. You need NGK or Denso Iridium plugs. Try moving the coil packs around to see if the misfire follows the coil pack.
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Old 01-31-2010, 06:07 PM   #5 (permalink)
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Default Re: Misfire code wont go away. P0302

okay it says P0302 correct? That means that the misfire is in cylinder number 2 being as #1 is the one closest to the radiator. When mine did this it was a bad coil pack. Since they already saw that you have after market plugs hey may not cover it!

Little know note All DTC codes P0301-P0312 is reserved for the cylinder number misfire.
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Old 01-31-2010, 06:17 PM   #6 (permalink)
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Default Re: Misfire code wont go away. P0302

Quote:
Originally Posted by devinoxford
okay it says P0302 correct? That means that the misfire is in cylinder number 2 being as #1 is the one closest to the radiator. When mine did this it was a bad coil pack. Since they already saw that you have after market plugs hey may not cover it!
The dealership is not going to void a warranty for non-factory spark plugs.
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Old 01-31-2010, 06:25 PM   #7 (permalink)
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Default Re: Misfire code wont go away. P0302

The easy way to test for a bad coil is to swap coil pack with another cylinder. If the misfire moves to that cylinder then you have a bad coil.check the plug wire or coil pack, they might be all carboned up and not delivering juice to the plug or plugs.
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Old 01-31-2010, 06:50 PM   #8 (permalink)
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Default Re: Misfire code wont go away. P0302

Quote:
Originally Posted by savannahcoly
AC Delco plugs are crap. You need NGK or Denso Iridium plugs. Try moving the coil packs around to see if the misfire follows the coil pack.
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Old 01-31-2010, 07:00 PM   #9 (permalink)
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Default Re: Misfire code wont go away. P0302

Quote:
Originally Posted by savannahcoly
Quote:
Originally Posted by devinoxford
okay it says P0302 correct? That means that the misfire is in cylinder number 2 being as #1 is the one closest to the radiator. When mine did this it was a bad coil pack. Since they already saw that you have after market plugs hey may not cover it!
The dealership is not going to void a warranty for non-factory spark plugs.

Seen it done before if it had the wrong ones in it like a platinum instead of iridium when it specifically states iridium. It gets classified as customer error that caused the part to fail due to the higher resistance with platinum.
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Old 01-31-2010, 08:41 PM   #10 (permalink)
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Default Re: Misfire code wont go away. P0302

Well considering GM recommended Iridiums starting in 2006 and for all subsequent year models, I don't think that would be a problem.
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