Thread: still mifiring..

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  1. #21 Re: still mifiring.. 
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    Icm is good. Coils are good. took off boots from wires. Running premium fuel drove it all morning also used some injector cleaner and octane booster. Still nothing. Checked compression thats good. I was sure that something would have worked! Any other suggestions?
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  2. #22 Re: still mifiring.. 
    GT Level Member Erik Adam Rodriguez's Avatar
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    are you getting any codes and also check the gap on your plugs. had same thing happen and closed the gap about .05 and fixed it
    02 grand prix gt- L67 swap, ZZP 1.0 pcm, thrasher CAI, SLP 2.5 catback, A/C delete, 02 emulator, poly dog bone mounts, 6000k projectors with CCFL halos, 12 in slotted front rotors, ported blower and intake, evap and EGR deleted, 12" kicker cvr with 1000 watt amp, alpine cda 9886 deck
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  3. #23 Re: still mifiring.. 
    GT Level Member solidsnake1972's Avatar
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    Quote Originally Posted by scottydoggs View Post
    those metal boots can cause misfires, sparks shoot off the boots to the manifolds.
    Well i guess i know what im doing today.lol
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  4. #24 Re: still mifiring.. 
    Moderator DanPrixGTP's Avatar
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    Clogged fuel filter? Not sure if someone said that already or not.
    '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. #25 Re: still mifiring.. 
    Killa Bee Scottydoggs's Avatar
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    i tossed mine during my first tune up, well before i knew they could cause a problem, seemed worthless to be on there, and they make the wires harder to deal with.

    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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  6. #26 Re: still mifiring.. 
    GT Level Member solidsnake1972's Avatar
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    Quote Originally Posted by circa09 View Post
    Icm is good. Coils are good. took off boots from wires. Running premium fuel drove it all morning also used some injector cleaner and octane booster. Still nothing. Checked compression thats good. I was sure that something would have worked! Any other suggestions?
    I had the same problem, at first i too was using regular gas and i kept getting a random misfire code and cylinder 3 sometimes. But i started using the 93 gas i had the code come on once, then i filled it up again and so far no codes came on. maybe it will take a tank or 2 for it to stop.
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  7. #27 Re: still mifiring.. 
    Moderator DanPrixGTP's Avatar
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    Dumb question.. but this happened to me.

    My Service engine light didnt clear on its own. It had to be manual reset with a scanner when i had a cylinder 6 misfire.

    I replace fuel filter, injectors, plugs, wires, coils and the cylinder 6 misfire was still there.

    finally i took an Aeroforce, scanned the car and i got 0 misfires, reset the code and it never came back.

    So what im trying to say, if you havent done this already, reset the Service Engine light code and do so after each fix you make.
    '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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  8. #28 Re: still mifiring.. 
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    Oh yah I have my own obd2 scanner plus I have a few at work.I do that. Anyways I got the problem fixed icm was bad. I swapped the coils around... Nothing... Checked all plugs and wires again... Nothing. The took icm into work and scanned it with my wells tester... Bad checked it like four times. 120$ later purrs like a kitten. But at work I ordered all new msd coils and wires and put those in this morning. Runs a whole lot smoother. Thanks a whole lot guys. All your help was great. And merry xmas! A day late but oh well lol.
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  9. #29 Re: still mifiring.. 
    Turbo is the way to go. Fivefingerdeathpunch's Avatar
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    Well you did good, then shot yourself in the foot with those MSD coils.

    I'm sure the car will run fine with them for a while, but sooner than later those MSD coils will likely end up causing another problem, they are known to not be good on our cars.

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  10. #30 Re: still mifiring.. 
    GTX Level Member asite57's Avatar
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    we have 85 octane here and its rare to find 91, the normal ones are regular: 87 midgrade: 89 premium: 93 and e85
    SOLD. 99 GTP - Open Cone, ZZP STB ,GMPP Front & Rear Sway Bar, 3" DP & Cat-Back, Built Trans, 12'' Brakes, Tune
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  11. #31 Re: still mifiring.. 
    The Blue One blueguy's Avatar
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    Quote Originally Posted by Fivefingerdeathpunch View Post
    Well you did good, then shot yourself in the foot with those MSD coils.

    I'm sure the car will run fine with them for a while, but sooner than later those MSD coils will likely end up causing another problem, they are known to not be good on our cars.
    Meh, I never had any issues with either my coils or my wires.
    Sold WBody's: '03 Blue GTP/'98 Green GTP/'98 Silver GT/'05 GXP
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  12. #32 Re: still mifiring.. 
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    Well I ran msd coils and wires on my last Gtp and ran great... Til I wrecked it lol. Which I miss that one.. but just starting my mods. And I ran into these problems. Oh another quick question. What do guy recomment for first pulley size drop? I don't want to drop it to far and damage other parts..
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  13. #33 Re: still mifiring.. 
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    yep go with stock coils
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