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  1. #1
    Bald Tire
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    Spark plug choices and idle stumble missfire

    Hey guys

    ac delco iridium at $9 each gap is .44
    or
    ngk iridium xl at $9 each gap is .43

    Question whats a better plug on a 07 hummer h3 with the 3.7 and why are both plugs show for the vehicle but different gaps.?


    Next heres a missfire issue

    not so perfect idle.Well its fine but if i give it gas then left off the gas the rpms drop and go very low then stumbles then evens out and runs fine but i had shop hook up to computer and there was a couple codes since last time.

    P0300
    B3152

    Also the live data shows cyc 3 missfire and when you press the gas and let go cyc 3 will give 3 or 4 missfires and cyc 2 and 5 show 1 but then dissapears and then all cyclinders show none and then after couple minutes cyc 3 will show again and after 10 minutes of running there was 16 on cyc 3 and 2 on 5.

    Could this be cause by dirty throttle body?

    I have changed battery terminals and enhuast manifold gasket and welded crack.
    spark plugs were changed a couple thousand kms ago due to random missfire. i checked and these are the plugs that were used 12625058 ACDelco Iridium Spark

    Any ideas?
    07 hummer h3 with the 3.7
    Last edited by blazed16; 04-15-2018 at 05:53 PM.

  2. #2
    Mud Terrain
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    I chose AcDelco.

    I'd replace the COP also.
    Clean maf & TB. Use the correct type of cleaner for each.

  3. #3
    Bald Tire
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    Quote Originally Posted by Happy Hummer View Post
    I chose AcDelco.

    I'd replace the COP also.
    Clean maf & TB. Use the correct type of cleaner for each.
    COP as replace all 5 coils?

    I have the maf and TB cleaner waiting just for some nice weather we still getting snow haha.

  4. #4
    Bogger
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    Swap coils around and see if the misfires shows up on the new cylinder. If the misfire moves then replace all the coils.
    2006 H3 Adventure & modified Rancho with SOA

  5. #5
    Bald Tire
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    3 2 and 5 all showed but 3 was worst. Im going to order a coil and switch with 3 and so on.

    Brand of coil motor products or ad delco ngk does it matter?

  6. #6
    Bald Tire
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    Quote Originally Posted by blazed16 View Post
    COP as replace all 5 coils?

    I have the maf and TB cleaner waiting just for some nice weather we still getting snow haha.
    3 2 and 5 all showed but 3 was worst. Im going to order a coil and switch with 3 and so on.

    Brand of coil motor products or ad delco ngk does it matter?

  7. #7
    El Diablo
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    Stay OEM and minimize any issues with aftermarket especially when troubleshooting an issue like this. You're not going to see a performance gain with different plugs or coils

    Sent from my SM-N950U using Tapatalk


 

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