Thread: Engine sputtering and no power. Help!!!

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  1. #1 Engine sputtering and no power. Help!!! 
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    I was on the hi way revving out the engine and this happened. The engine shakes and sputters.

    Green machine - YouTube
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  2. #2 Re: Engine sputtering and no power. Help!!! 
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    One thread per topic guy.

    Have the stock cat?
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  3. #3 Re: Engine sputtering and no power. Help!!! 
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    Didn't know the other one posted. The exhaust is broken. So no cat on it.

    If I lift the pipe then it would be stock
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  4. #4 Re: Engine sputtering and no power. Help!!! 
    Turbo is the way to go. Fivefingerdeathpunch's Avatar
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    Any SES lights?

    Any misfires?

    Those MSD coils are junk, replace with stock.

    I'd pull the plugs just for the hell of it to see what they look like.

    SMGPFC Member #1
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  5. #5 Re: Engine sputtering and no power. Help!!! 
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    It is misfiring. Checking the plugs tomorrow. I'm hoping that is what it is. I've done a lot of mods but never changed the plugs. I'm not sure what are in it. I just hope I didn't bend a push rod
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  6. #6 Re: Engine sputtering and no power. Help!!! 
    Turbo is the way to go. Fivefingerdeathpunch's Avatar
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    bending a push rod is a least of your worries.

    Having a chipped piston is what you dont want to see.

    If any of the plugs have missing tops, you have internal damage.

    But you wont know till you take them out.

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  7. #7 Re: Engine sputtering and no power. Help!!! 
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    Can't the tip burn off if it's old and burning hot?
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  8. #8 Re: Engine sputtering and no power. Help!!! 
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    If the plugs are old and worn, that will typically show up slowly over time with loss of performance and bad fuel economy. Since your issue happened quickly while "revving out the engine", I doubt it would be cause by worn plugs.
    How much KR did you have before the problems started?
    98 GTP coupe
    3.4 mps,plog,3"dp no cat,1.9 rockers 4" intake,EGR delete,Drilled 180,AL104,TBS removed,Glasspack,Overkill pcm,18",ect... At 5500' elevation
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  9. #9 Re: Engine sputtering and no power. Help!!! 
    GrandPrix Junkie
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    So you've done "a lot of mods" but never changed the spark plugs??? Not good. I have a feeling we could see another longblock on the way. Is the CEL on? Have you scanned it for codes anyway even if its not on? That can tell us a lot.

    What are your mods? Besides the MSD coils (which has already been mentioned to change back to stock) and MSD wires. Looked like a smaller pulley on the S/C as well. Running premium (91+ octane) in it all the time?
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  10. #10 Re: Engine sputtering and no power. Help!!! 
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    crank, heads, intercooler, cold air, and more...
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  11. #11 Re: Engine sputtering and no power. Help!!! 
     

  12. #12 Re: Engine sputtering and no power. Help!!! 
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  13. #13 Re: Engine sputtering and no power. Help!!! 
    SE Level Member Dragon1972's Avatar
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    Chipped piston, mine did 3. Full rebuild on L36 block shortly after.
    Master Certified Automobile Technician
    1997 GP GT-SC
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  14. #14 Re: Engine sputtering and no power. Help!!! 
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    Sounds as good as my friend's car when he chipped a few pistons.
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  15. #15 Re: Engine sputtering and no power. Help!!! 
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    Found the problem

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  16. #16 Re: Engine sputtering and no power. Help!!! 
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    And it was...?
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  17. #17 Re: Engine sputtering and no power. Help!!! 
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    Looks like you probably chipped a piston to cause that.
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  18. #18 Re: Engine sputtering and no power. Help!!! 
    Turbo is the way to go. Fivefingerdeathpunch's Avatar
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    I wouldnt have gone with iridums, but they might work,

    Because of your mods, its best to run a colder plug with the power you are pushing. Autolte 104's would have been better, but I guess you'll have to see how the car performs.

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  19. #19 Re: Engine sputtering and no power. Help!!! 
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    Quote Originally Posted by Fivefingerdeathpunch View Post
    I wouldnt have gone with iridums, but they might work,

    Because of your mods, its best to run a colder plug with the power you are pushing. Autolte 104's would have been better, but I guess you'll have to see how the car performs.
    Why colder? Everyone always told me hotter spark for hi proformance engines. Hot coils plus and ignition.
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  20. #20 Re: Engine sputtering and no power. Help!!! 
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    They seem fine. Car has never ran so good. Just feels soo smooth now.
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