Code P0302 #6 Misfire. Need Help! Changed Plugs and Coil. - Chevy TrailBlazer, TrailBlazer SS and GMC Envoy Forum



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Go Back   Chevy TrailBlazer, TrailBlazer SS and GMC Envoy Forum > 2002 - 2009 TrailBlazer/Envoy Tech > 02-09 Vortec 4.2L I-6 Engine and Drivetrain > OEM Issues

OEM Issues Original Equipment Repairs and/or Problems

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  #1  
Old 06-10-2008, 08:51 AM
carnorvor carnorvor is offline
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Code P0302 #6 Misfire. Need Help! Changed Plugs and Coil.

Car just started running really Rough when I was driving it. (2002 Trailblazer 140,000 miles)

I changed all the plugs first (they were still the factory plugs) Then still had the same code. It said cyl. #6 missfire. I then changed the cold for that cyl.

Still get same code and it still runs like crap.

Anyhelp??????

Thanks so much!
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  #2  
Old 06-10-2008, 09:19 AM
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Quote:
Originally Posted by carnorvor View Post
It said cyl. #6 missfire. I then changed the cold for that cyl.
Not sure what you mean by this.....
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  #3  
Old 06-10-2008, 09:56 AM
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wbsterritt wbsterritt is offline
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what's the code?

What exactly is the DTC code that shows?
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  #4  
Old 06-10-2008, 10:21 AM
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Quote:
Originally Posted by carnorvor View Post
Car just started running really Rough when I was driving it. (2002 Trailblazer 140,000 miles)

I changed all the plugs first (they were still the factory plugs) Then still had the same code. It said cyl. #6 missfire. I then changed the cold for that cyl.

Still get same code and it still runs like crap.

Anyhelp??????

Thanks so much!
Isn't P0302 cyl # 2? If nothing else just swap coils 2 and 1 and see if the code changes from one cyl to another.
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Old 06-10-2008, 10:22 AM
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Quote:
Originally Posted by Robert1101 View Post
Isn't P0302 cyl # 2?
That's what I thought too
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  #6  
Old 06-10-2008, 07:42 PM
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P0302- Fault Cylinder B-Misfire Detected (CYL2). I agree with the replies above. try changing the coil for the Second Cylinder.
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  #7  
Old 06-12-2008, 12:00 PM
carnorvor carnorvor is offline
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Quote:
Originally Posted by petevw View Post
Not sure what you mean by this.....
I meant coil sorry.


Also, it was code PO306 sorry again.

I was in a hurry typing this.

I think it might be a fuel injector.

Is there any information for a "how to" to change out an injector????
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Old 06-12-2008, 12:01 PM
carnorvor carnorvor is offline
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I did by a new coil and it still runs bad.
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  #9  
Old 06-13-2008, 01:51 AM
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Make sure that you're changing the coil for the right cylinder. a lot of people get the #1 and #6 cylinder's confused. if its still misfiring and shooting codes, then yea, it's most likely the fuel injector. i'm not really sure how to change that since i haven't done it before. but as a tip. every now and then run a bottle of techron. makes a BIG difference.
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  #10  
Old 06-13-2008, 07:58 AM
carnorvor carnorvor is offline
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Autozone told me #6 was the one closest to the firewall. So thats the one I changed.

I did run techron through this 2 days ago, but never before that.

Any links to help me change the fuel injectors??
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