Thread: Chasing Misfires

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  1. #1 Chasing Misfires 
    Moderator DanPrixGTP's Avatar
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    Recently my car decided to throw some misfires at me. Yes, that's not right, not 1 or 2 misfires, but every cylinder. Idle, car has a very minor miss, WOT car has no misses, but while cruising or under some kind of load (other than WOT), car misses like crazy. According to my aeroforce, the misfires are scattered across all 6 cylinders. Everytime I feel it miss, I see on my wideband leans out to 16.5+.

    Now I've thrown a few parts at it to see if anything helps.

    - ICM, no change.
    - OEM Plug wire, no change.
    - New AL104s, no change
    - Coil packs tested for continuity and resistance, all checked good.

    I'm started to tend to think its injector or fuel related. My next step is to (hopefully) replace the fuel filter. Keep in mind, Im running stock injectors on my setup (in my sig), so I'm thinking my injectors are finally crapping out on me? Odd they all are at the same time though. I'm also going to check the injectors for specified resistance.

    Curious if anyone has any ideas before I start throwing more money and parts at it.
    '97 GTP - Stage 2 Heads, 90# Springs, 1.9 Harland Sharp Rockers, Gen V, 3.0, Intake, N* TB, LQ4, FSIC, 10.5mm Wires, Poly Mounts, SLP Headers, Borla Exaust, Built Trans - SOLD*

    '08 G8 GT - 6.7L 408CI Stroker, 239/254 Cam, Fast Intake, 102mm TB, CAI, Full Exhaust.





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  2. #2 Re: Chasing Misfires 
    Moderator DanPrixGTP's Avatar
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    Bump.
    '97 GTP - Stage 2 Heads, 90# Springs, 1.9 Harland Sharp Rockers, Gen V, 3.0, Intake, N* TB, LQ4, FSIC, 10.5mm Wires, Poly Mounts, SLP Headers, Borla Exaust, Built Trans - SOLD*

    '08 G8 GT - 6.7L 408CI Stroker, 239/254 Cam, Fast Intake, 102mm TB, CAI, Full Exhaust.





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  3. #3 Re: Chasing Misfires 
    Turbo is the way to go. Fivefingerdeathpunch's Avatar
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    Check wiring from ICM to cam/crank sensor??

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  4. #4 Re: Chasing Misfires 
    Moderator DanPrixGTP's Avatar
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    I could but it's all in wire loom, I'd have to take it all apart.

    I have a couple spare stock injectors in my garage I might try swapping out tonight.
    '97 GTP - Stage 2 Heads, 90# Springs, 1.9 Harland Sharp Rockers, Gen V, 3.0, Intake, N* TB, LQ4, FSIC, 10.5mm Wires, Poly Mounts, SLP Headers, Borla Exaust, Built Trans - SOLD*

    '08 G8 GT - 6.7L 408CI Stroker, 239/254 Cam, Fast Intake, 102mm TB, CAI, Full Exhaust.





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  5. #5 Re: Chasing Misfires 
    Moderator DanPrixGTP's Avatar
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    Replaced injectors with some stock ones I had laying in the garage, no change.
    '97 GTP - Stage 2 Heads, 90# Springs, 1.9 Harland Sharp Rockers, Gen V, 3.0, Intake, N* TB, LQ4, FSIC, 10.5mm Wires, Poly Mounts, SLP Headers, Borla Exaust, Built Trans - SOLD*

    '08 G8 GT - 6.7L 408CI Stroker, 239/254 Cam, Fast Intake, 102mm TB, CAI, Full Exhaust.





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  6. #6 Re: Chasing Misfires 
    Moderator DanPrixGTP's Avatar
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    Incase anybody cared at all, which you all probably dont, it ended up being the MAF sensor. She's back together and running like a raped ape again.
    '97 GTP - Stage 2 Heads, 90# Springs, 1.9 Harland Sharp Rockers, Gen V, 3.0, Intake, N* TB, LQ4, FSIC, 10.5mm Wires, Poly Mounts, SLP Headers, Borla Exaust, Built Trans - SOLD*

    '08 G8 GT - 6.7L 408CI Stroker, 239/254 Cam, Fast Intake, 102mm TB, CAI, Full Exhaust.





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  7. #7 Re: Chasing Misfires 
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    Quick question. Did you get any codes at all? Kinda having a similar issue with the imp think its the spark plugs... Hopefully it is

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  8. #8 Re: Chasing Misfires 
    GT Level Member 04GTP4dr's Avatar
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    I'm chasing a random misfire code too cylinder 3 mainly n very lil from cylinder 2 &4

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