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1999 grand am 3400

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  • May 24, 2019 at 9:56 pm #893624
    Conrad HutchingsConrad Hutchings
    Participant

      I have a 1999 grand am that has a multiple miss fires I have changed coil packs and spark plugs just waiting on wires to come in and I can’t figer out why it keeps miss firing also did upper and lower intake manifolds gaskets

      Thanks huchters358

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    • May 24, 2019 at 11:14 pm #893626
      A toyotakarlIts me
      Moderator

        If you have tried everything, it may be time for a compression test of all the cylinders to check the mechanical condition.

        Also, Fuel delivery issues can cause misfires, be it bad/grounded fuel injectors, or a weak pump.

        Good luck

        -Karl

        May 24, 2019 at 11:16 pm #893627
        Conrad HutchingsConrad Hutchings
        Participant

          I forgot to say I did do a compression test on them all between 130 150 brand new fuel pump and filter 2months ago

          May 24, 2019 at 11:19 pm #893628
          A toyotakarlIts me
          Moderator

            May want to try a noid light on those fuel injector connectors. See how well they are working…

            Also, 130 is pretty low. I have seen engines that run that low, but I would rather see them 150+ at worst.

            -Karl

            July 7, 2019 at 6:11 am #893928
            Conrad HutchingsConrad Hutchings
            Participant

              so i have replaces the fuel pump fuel filter spark plugs coils wires and upper and lower intake and upper intake manifold gasket and all 6 fuel injectors still cant figer out what is going on just wondring if any of you guys would now what it be

              Thanks Huchters358

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