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Thread: Help!!backfire problem

  1. #11
    Join Date
    Nov 2007
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    Pittsburgh, PA
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    weres the old plugs? check them carefully for any orange color. if you have any discoloration you have coolant leaking into the combustion chamber causing your misfire/popping/backfire.
    2002 Lightning - GT headed 5.5Litre w/ Twin 7665s
    2002 Silverado - 427Lsx w/ Twin gt4202s
    2010 Silverado crewcab Z71 - 5.3litre w/ procharger
    2000 Wrangler - 5.3litre with some stance
    2014 Xsport- 3.5 Eco boost
    412 Motorsports

    it ain't that I'm too big to listen to the rumors, It's just that I'm too damn big to pay attention to 'em..That's the difference

  2. #12
    Join Date
    Jan 2008
    Posts
    8,031
    old plugs were delcos they were good....just started it a while ago its still does it fukin sux and pisses me off

  3. #13
    Join Date
    Sep 2010
    Location
    Texas
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    2,112
    Contact Dr. Nelson.
    2013 EC Silverado aka redruM (Just a couple bolt ons.)
    2007 RC Silverado aka ?
    1998 Trans AM aka Red Dragon

    "Your pull your truck to the track on a trailer, I race you with a truck that pulled a trailer to the track."

  4. #14
    Join Date
    Mar 2007
    Posts
    1,705
    Quote Originally Posted by double047 View Post
    Contact Dr. Nelson.
    a witch doctor will be better !

  5. #15
    Join Date
    Jan 2008
    Posts
    8,031
    checked plugs,checked pushrods,found a dried cracked vacuum cap put a new one and this thing still pops.yea it needs a wideband hookup just to see where shes at

  6. #16
    Join Date
    Aug 2008
    Location
    mansfield texas
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    3,512
    Damn bro ur catchin hell with this huh... Best of luck!

  7. #17
    Join Date
    Nov 2007
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    Pittsburgh, PA
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    post pics of all the plugs.
    Quote Originally Posted by STUNNA View Post
    checked plugs,checked pushrods,found a dried cracked vacuum cap put a new one and this thing still pops.yea it needs a wideband hookup just to see where shes at
    2002 Lightning - GT headed 5.5Litre w/ Twin 7665s
    2002 Silverado - 427Lsx w/ Twin gt4202s
    2010 Silverado crewcab Z71 - 5.3litre w/ procharger
    2000 Wrangler - 5.3litre with some stance
    2014 Xsport- 3.5 Eco boost
    412 Motorsports

    it ain't that I'm too big to listen to the rumors, It's just that I'm too damn big to pay attention to 'em..That's the difference

  8. #18
    Join Date
    Dec 2009
    Location
    houston tx
    Posts
    195
    i know what the problem is..... its a huge problem on all 07+nnbs engines it happens alot when u go WOT.

  9. #19
    Join Date
    Jan 2008
    Posts
    8,031
    sorry i put the plugs back in they were fine just a lil carbon.... my engine light comes and goes ....still pops though......guess its not that bad cause i pulled a new 5.0 other day at 60 roll lol...its just from a dig right when i punch it it POP....even parked reving it pop pop

  10. #20
    Join Date
    Dec 2009
    Location
    houston tx
    Posts
    195
    Quote Originally Posted by CHEVROLADE View Post
    sorry i put the plugs back in they were fine just a lil carbon.... my engine light comes and goes ....still pops though......guess its not that bad cause i pulled a new 5.0 other day at 60 roll lol...its just from a dig right when i punch it it POP....even parked reving it pop pop
    then u still have the problem.

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