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  • diagnostic and backfire issue

    I have a 94 3.4 bird and it has a backfire issue, it isnt consistence like it popping every few seconds but when i go to give it power it will pop like crazy and when it gets up to 50 60 it starts to run rough, now i have a fresh tune up on it and a new egr valve. what are some other things it can be? my buddy and i thought it might be the timing but we are leaning away from that since its not consistent. i also made sure i have good gas and put some good injector cleaner

    my next question is how do i run the diagnostic on it? i have the little key thing but when i put it in, it doesnt do anything?

  • #2
    Re: diagnostic and backfire issue

    i doubt it is the timing also, the timing is all computer controlled, and would take either a reprogram of the ecm, or a skipped timing chain to change it.

    check your spark plugs to see if they are firing, and also check the plug wires, one may have become burnt, or a bad coil.

    since you just got a tune up, my guess is a plug is not firing, and the gas is burning from the hot exhaust.

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    • #3
      Re: diagnostic and backfire issue

      Maybe a stuck or sticking injector, no codes showing up? Do you have a scanner?
      08' L76 6.0L 4X4 Chevy EXT.Cab LTZ Vortec MAX with Snug top cover, Dynomax exhaust,Hptuners& K&N intake
      96' Camaro M5 to A4 conversion, alot of mods . GT35R Turbo full suspension. Built engine

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