Thread: Tried everything for this misfire

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  1. #1 Tried everything for this misfire 
    GT Level Member Dadkota's Avatar
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    Some of you may have seen my thread from a few weeks ago about fixing a misfire. Well here is the update:

    Plugs- new
    Wires- new
    Coilpack- new
    Injector- replaced with tested good one
    Cleaned every connection I could possibly relate to the issue.
    No boost/vacuum leaks

    Car is still misfiring when it sees any boost at all, runs great under non-boost conditions though. This Saturday I'm gonna replace the ICM in hopes that it's the issue. Any input?
    '01 GP GTP- Intake, Plog, 3" DP and Exhaust, DHP tuned by me, GMPP sway bars, 3.5 MPS, cold plugs and tstat
    -180,000 miles and climbing
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  2. #2 Re: Tried everything for this misfire 
    GTP Level Member Tonkin2000GT's Avatar
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    Did you do a compression check?

    Sent from my SM-G920V using Tapatalk
    00 Grand Prix GT, top swapped, .020 FMP, GT1 Cam, SFI Crank pulley, SSM90, 3.3 MPS, ZZP ported Gen 3/LIM, ported heads, #90's, N* TB, SLP Intake/Headers/Catback, F-body brakes, KYB AGX, Aeroforce, AEM, 93 octane.
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  3. #3 Re: Tried everything for this misfire 
    GT Level Member Dadkota's Avatar
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    Yes! Knew I was forgetting something, I checked compression and it tested perfect!
    '01 GP GTP- Intake, Plog, 3" DP and Exhaust, DHP tuned by me, GMPP sway bars, 3.5 MPS, cold plugs and tstat
    -180,000 miles and climbing
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  4. #4 Re: Tried everything for this misfire 
    GT Level Member Dadkota's Avatar
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    Its only cylinder 1 btw
    '01 GP GTP- Intake, Plog, 3" DP and Exhaust, DHP tuned by me, GMPP sway bars, 3.5 MPS, cold plugs and tstat
    -180,000 miles and climbing
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  5. #5 Re: Tried everything for this misfire 
    GTP Level Member Tonkin2000GT's Avatar
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    Weird

    Sent from my SM-G920V using Tapatalk
    00 Grand Prix GT, top swapped, .020 FMP, GT1 Cam, SFI Crank pulley, SSM90, 3.3 MPS, ZZP ported Gen 3/LIM, ported heads, #90's, N* TB, SLP Intake/Headers/Catback, F-body brakes, KYB AGX, Aeroforce, AEM, 93 octane.
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  6. #6 Re: Tried everything for this misfire 
    GT Level Member Dadkota's Avatar
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    Tell me about it lol driving me insane!
    '01 GP GTP- Intake, Plog, 3" DP and Exhaust, DHP tuned by me, GMPP sway bars, 3.5 MPS, cold plugs and tstat
    -180,000 miles and climbing
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  7. #7 Re: Tried everything for this misfire 
    GTP Level Member Tonkin2000GT's Avatar
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    How much boost are you running ? Is the car stock?

    Sent from my SM-G920V using Tapatalk
    00 Grand Prix GT, top swapped, .020 FMP, GT1 Cam, SFI Crank pulley, SSM90, 3.3 MPS, ZZP ported Gen 3/LIM, ported heads, #90's, N* TB, SLP Intake/Headers/Catback, F-body brakes, KYB AGX, Aeroforce, AEM, 93 octane.
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  8. #8 Re: Tried everything for this misfire 
    Killa Bee Scottydoggs's Avatar
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    what plugs you use?

    icm could be bad, or a bad wire some where.

    98 Buick Regal GS, F body brakes, Caddy STS wheels, tinted tails L36 bottom end, lightly ported heads, 1.95 roller rockers, headers, gen 5 N* 3.0 pulley, FSIC, 42 lb injectors, a BrandonHall rebuilt trans, DHP tuned and AEM water/Meth injection https://goo.gl/gpV5kW
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  9. #9 Re: Tried everything for this misfire 
    GT Level Member Dadkota's Avatar
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    Wires were tested and found good, TR6 plugs that are 300 miles old.

    Car isn't stock but the car was driving great before like 3 weeks ago. No new mods were added, 3.5 pulley btw.

    I compression tested and checked plugs to make sure I didn't chip piston or have carbon buildup on valves
    '01 GP GTP- Intake, Plog, 3" DP and Exhaust, DHP tuned by me, GMPP sway bars, 3.5 MPS, cold plugs and tstat
    -180,000 miles and climbing
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  10. #10 Re: Tried everything for this misfire 
    Killa Bee Scottydoggs's Avatar
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    are you using a real plug socket? time to time the porcelain cracks during install of the plugs if you use a normal socket.

    and by wire i mean one from the cars harness, like a injector wire or a wire near the pcm. things can rub through.

    98 Buick Regal GS, F body brakes, Caddy STS wheels, tinted tails L36 bottom end, lightly ported heads, 1.95 roller rockers, headers, gen 5 N* 3.0 pulley, FSIC, 42 lb injectors, a BrandonHall rebuilt trans, DHP tuned and AEM water/Meth injection https://goo.gl/gpV5kW
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  11. #11 Re: Tried everything for this misfire 
    GT Level Member Dadkota's Avatar
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    Yea I use a plug socket, I try not to be a hack as much as possible haha the only thing I didn't put the multimeter on is the injector lead. I ohmed the injectors themselves but didn't test the leads going to them. It's just so weird that it fires fine under normal conditions but skips in boost. The only other things I can think of is bad ICM or a bad wire giving reduced voltage to the plugs/injectors
    '01 GP GTP- Intake, Plog, 3" DP and Exhaust, DHP tuned by me, GMPP sway bars, 3.5 MPS, cold plugs and tstat
    -180,000 miles and climbing
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  12. #12 Re: Tried everything for this misfire 
    Killa Bee Scottydoggs's Avatar
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    you 100% sure the wires are on right? sh it happens lol

    what are the plugs gaped at? this start after or before the plug change?

    98 Buick Regal GS, F body brakes, Caddy STS wheels, tinted tails L36 bottom end, lightly ported heads, 1.95 roller rockers, headers, gen 5 N* 3.0 pulley, FSIC, 42 lb injectors, a BrandonHall rebuilt trans, DHP tuned and AEM water/Meth injection https://goo.gl/gpV5kW
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  13. #13 Re: Tried everything for this misfire 
    GT Level Member Dadkota's Avatar
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    Plugs are at .55 gap, but this problem was actually worse before plug change. Plugs helped a bit, any chance it could be a glitch in the PCM?
    '01 GP GTP- Intake, Plog, 3" DP and Exhaust, DHP tuned by me, GMPP sway bars, 3.5 MPS, cold plugs and tstat
    -180,000 miles and climbing
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  14. #14 Re: Tried everything for this misfire 
    GT Level Member Dadkota's Avatar
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    Do you mean plug wires? Lol yes I'm 100% sure they are on right hahaha
    '01 GP GTP- Intake, Plog, 3" DP and Exhaust, DHP tuned by me, GMPP sway bars, 3.5 MPS, cold plugs and tstat
    -180,000 miles and climbing
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  15. #15 Re: Tried everything for this misfire 
    Killa Bee Scottydoggs's Avatar
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    you can also look around for a rubbed wire, the metal loop at the dog bone that hols the harness, near and to the pcm, injector harness icm harness and the likes.

    ive ran those plugs for like 20 miles, went to al 104's gaped to 0.50, car loves them so much better.

    98 Buick Regal GS, F body brakes, Caddy STS wheels, tinted tails L36 bottom end, lightly ported heads, 1.95 roller rockers, headers, gen 5 N* 3.0 pulley, FSIC, 42 lb injectors, a BrandonHall rebuilt trans, DHP tuned and AEM water/Meth injection https://goo.gl/gpV5kW
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  16. #16 Re: Tried everything for this misfire 
    GT Level Member Dadkota's Avatar
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    Really? See my car likes the TR6 wayyyy more! Next Saturday imma get an ICM from the junkyard and start looking for freyed wires I guess lol
    '01 GP GTP- Intake, Plog, 3" DP and Exhaust, DHP tuned by me, GMPP sway bars, 3.5 MPS, cold plugs and tstat
    -180,000 miles and climbing
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  17. #17 Re: Tried everything for this misfire 
    Killa Bee Scottydoggs's Avatar
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    you need to play the gap game with any plug till you feel whats seems best. i gaped em at 60 then 55 then 53 then 50.


    nothing felt as good as the 104's gaped to 50, did the same drill with both plugs.


    yes thats a lot of plug pulling. and it kinda sucks.


    either way, unless the plug is cracked i cant see the brand or temp being the misfire.

    98 Buick Regal GS, F body brakes, Caddy STS wheels, tinted tails L36 bottom end, lightly ported heads, 1.95 roller rockers, headers, gen 5 N* 3.0 pulley, FSIC, 42 lb injectors, a BrandonHall rebuilt trans, DHP tuned and AEM water/Meth injection https://goo.gl/gpV5kW
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  18. #18 Re: Tried everything for this misfire 
    GT Level Member Dadkota's Avatar
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    I just can't figure it out for the life of me, almost to the point of just buying a new GP lmao
    '01 GP GTP- Intake, Plog, 3" DP and Exhaust, DHP tuned by me, GMPP sway bars, 3.5 MPS, cold plugs and tstat
    -180,000 miles and climbing
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  19. #19 Re: Tried everything for this misfire 
    GTP Level Member Tonkin2000GT's Avatar
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    I'm pretty sure I have a extra ICM laying around from when I did my top swap

    Sent from my SM-G920V using Tapatalk
    00 Grand Prix GT, top swapped, .020 FMP, GT1 Cam, SFI Crank pulley, SSM90, 3.3 MPS, ZZP ported Gen 3/LIM, ported heads, #90's, N* TB, SLP Intake/Headers/Catback, F-body brakes, KYB AGX, Aeroforce, AEM, 93 octane.
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  20. #20 Re: Tried everything for this misfire 
    I live here. ericspecullaas's Avatar
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    did you try throwing the kitchen sink at it? all joking aside i hope you get it fixed
    im a cookie again yay me
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