Misfire code wont go away. P0302 - Chevy Colorado & GMC Canyon
 
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post #1 of 18 (permalink) Old 01-30-2010, 04:15 PM Thread Starter
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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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post #2 of 18 (permalink) Old 01-30-2010, 07:32 PM
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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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post #3 of 18 (permalink) Old 01-31-2010, 07:36 AM Thread Starter
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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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post #4 of 18 (permalink) Old 01-31-2010, 06:45 PM
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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.

180 RWHP 2.8 and still needing to dyno and tune for the custom cams.

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post #5 of 18 (permalink) Old 01-31-2010, 07:07 PM
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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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post #6 of 18 (permalink) Old 01-31-2010, 07:17 PM
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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.

180 RWHP 2.8 and still needing to dyno and tune for the custom cams.

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post #7 of 18 (permalink) Old 01-31-2010, 07:25 PM
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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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post #8 of 18 (permalink) Old 01-31-2010, 07:50 PM
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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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post #9 of 18 (permalink) Old 01-31-2010, 08:00 PM
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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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post #10 of 18 (permalink) Old 01-31-2010, 09:41 PM
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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.

180 RWHP 2.8 and still needing to dyno and tune for the custom cams.

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post #11 of 18 (permalink) Old 02-01-2010, 02:27 PM Thread Starter
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Re: Misfire code wont go away. P0302

ok... I have swapped coil packs and the problem is still there. There are iridium plugs in it now. Not fixed. The only thing I can think of, as much as I donít want to say it, is the dealership I took it to for the head swap didnít do a damn thing. Guess Iím taking it to another dealership. Oh well.

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post #12 of 18 (permalink) Old 02-01-2010, 04:10 PM
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Re: Misfire code wont go away. P0302

Doesn't sound like they swapped the head on it. It would take them longer than 2 days.

180 RWHP 2.8 and still needing to dyno and tune for the custom cams.

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post #13 of 18 (permalink) Old 02-02-2010, 12:13 AM Thread Starter
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Re: Misfire code wont go away. P0302

Yeah, thats what im thinking. they said they broke four bolts pulling it out and i can see new bolts, also a couple new seals. im thinking they pulled the bad one off and put it back on. Its really too bad that a dealership would pull some shit like this. Theyre known for ripping people off, but the work gets done at least.

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post #14 of 18 (permalink) Old 02-02-2010, 04:08 AM
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Re: Misfire code wont go away. P0302

I doubt they put the same head back on man, don't go assuming shit now. Just take it back to them and have em look at it plain and simple.

We did 2 cylinder heads on a single Colorado once with the same misfires occuring. Turns out someone poured sugar into the tank and clogged all the fuel injectors causing the mis.

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post #15 of 18 (permalink) Old 02-02-2010, 08:56 AM
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Re: Misfire code wont go away. P0302

Quote:
Originally Posted by savannahcoly
Doesn't sound like they swapped the head on it. It would take them longer than 2 days.
I just had mine done, it was in the shop for over two weeks, between the additional testing needed, then they have to pull it apart and then order the parts. 2 days - no way.

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post #16 of 18 (permalink) Old 02-02-2010, 03:09 PM
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Re: Misfire code wont go away. P0302

I've done the whole head job in a day, it only pays like 6 hours now with this new tensioner tool we have. No longer need to pull the oil pan and front cover off anymore.

It all depends on the dealer's work load.

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post #17 of 18 (permalink) Old 03-06-2010, 02:35 PM
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Re: Misfire code wont go away. P0302

Quote:
Originally Posted by turbizzy
I've done the whole head job in a day, it only pays like 6 hours now with this new tensioner tool we have. No longer need to pull the oil pan and front cover off anymore.

It all depends on the dealer's work load.
Left my truck at the dealership thursday afternoon and was told head and springs should be in friday for a late monday completion. Mech said GM warranty repair was 7 hours. Fingers crossed.

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post #18 of 18 (permalink) Old 03-06-2010, 03:55 PM
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Re: Misfire code wont go away. P0302

The invoice should detail exactly what work was performed- I have the same head that came with the truck- the dealership sent it out to a machine shop to have new guides put in. That is the key- new valve guides. If the newer valves guides, or a new post-Service bulletin head was installed, the coil has checked out, new plugs were installed then you need to start looking at fuel or electrical. Fuel being the injector, since everything else is working, electrical being the coil lead.

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