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Thread: Missifre

  1. #1
    Join Date
    May 2010
    Location
    Dallas Texas
    Posts
    28

    Missifre

    Finally got my new 6.0 running and I think it has a missfire. It runs pretty rich (you can smell it, and once I saw a flash of blue flame coming from the pass side open header. It has new NGk plug, and msd wires. I did a compression check just to make sure it was a mechancal problem and got 175-180 psi the cylinders. Where should I start in looking for my miss and how should I go about doing it? Please any advice would be appreciated I really want to get my baby back on the road terrorizing the neighborhood.
    2000 GMC Sierra Z71 6.0 LQ9, Mahle Forged Flatops, Comp 208/212-554/558 115 LSA, LS6 Valvesprings, Harland Sharp Roller Rockers,Trick Flow 7.4 pushrods, NGK TR55 plugs, MSD wires, Melling High Volume/Pressure oil pump,LS7 lifters, Arp main studs-rod bolts-head bolts, Nelson's 93 Octane Tune, rear 02's and Egr Delete, BBK headers ito true 2 3/4 duals w/dual super 40 flowmasters, built 4L60E, Circle-D 3200 stall

  2. #2
    Join Date
    Aug 2007
    Posts
    754
    I'd start with o2's. I just went through a very similar issue and that's all it was.

  3. #3
    Join Date
    May 2010
    Location
    Dallas Texas
    Posts
    28
    02s are cheap so I will prob try and pick some up this week and put them in and see what happens
    2000 GMC Sierra Z71 6.0 LQ9, Mahle Forged Flatops, Comp 208/212-554/558 115 LSA, LS6 Valvesprings, Harland Sharp Roller Rockers,Trick Flow 7.4 pushrods, NGK TR55 plugs, MSD wires, Melling High Volume/Pressure oil pump,LS7 lifters, Arp main studs-rod bolts-head bolts, Nelson's 93 Octane Tune, rear 02's and Egr Delete, BBK headers ito true 2 3/4 duals w/dual super 40 flowmasters, built 4L60E, Circle-D 3200 stall

  4. #4
    Join Date
    Aug 2007
    Posts
    754
    Sounds like you may only need one side. Pull a plug or two on on each side. I bet your passenger side is pitch black.

  5. #5
    Join Date
    May 2010
    Location
    Dallas Texas
    Posts
    28
    just noticied that I never left a reply here after fixin the truck along time ago, and yes it was the 02 probably damaged it trying to get the exhaust out from under the truck sorry so long
    2000 GMC Sierra Z71 6.0 LQ9, Mahle Forged Flatops, Comp 208/212-554/558 115 LSA, LS6 Valvesprings, Harland Sharp Roller Rockers,Trick Flow 7.4 pushrods, NGK TR55 plugs, MSD wires, Melling High Volume/Pressure oil pump,LS7 lifters, Arp main studs-rod bolts-head bolts, Nelson's 93 Octane Tune, rear 02's and Egr Delete, BBK headers ito true 2 3/4 duals w/dual super 40 flowmasters, built 4L60E, Circle-D 3200 stall

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