Thread: engine missing and bucking at operating temp

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  1. #1 engine missing and bucking at operating temp 
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    Hello all,

    I have been trying to figure out what is going on with my 2000 GTP. When the engine is cold the car runs like a champ. When it hits operating temperature it runs like a chump. As soon as the operating temperature is reached the car bucks like a bronco with almost any load you put on it (it like it is misfiring really bad). When you get it up to speed on the freeway it runs great as long as you do not need to accelerate. I installed new coil packs, plugs and wires before I noticed that it only happened at operating temp. I do not get any Check engine lights and no codes are being thrown. I am thinking it must be sensor related but I do not know which one to start with. I have a spare engine I could swap parts off if needed. Any recommendations where to start.
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  2. #2 Re: engine missing and bucking at operating temp 
    GrandPrix Junkie
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    Have you cleaned the MAF? I'd start there and see what you get. Also, may want to check for vac. leaks.

    Jay
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  3. #3 Re: engine missing and bucking at operating temp 
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    I just tried swapping out he MAF and it did not seem to make a difference
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  4. #4 Re: engine missing and bucking at operating temp 
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    Anyone have any other ideas
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  5. #5 Re: engine missing and bucking at operating temp 
    GTX Level Member EJOUIE's Avatar
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    ICM?
    97 GT white 4 door-SOLD

    Cherry 2005 Impala LS- Front and Rear GMPP Strut Tower Braces
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  6. #6 Re: engine missing and bucking at operating temp 
    GTX Level Member tayl5645's Avatar
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    From the sounds of it it only has problems while a load is applied?? Not at idle? If so I would expect a clogged cat however, the temperature shouldnt make a difference.... hmmm
    2005 GTP Grey

    Custom built Open cone intake, 15% tints all the way around, 7" touchscreen DVD player
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  7. #7 Re: engine missing and bucking at operating temp 
    GTP Level Member 01gpgt01's Avatar
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    Sounds like a open loop vs closed loop issue. Maybe you have a 02 on the fritz
    2001 GT. A few here and there mods http://www.streetfire.net/video/2001...ynp_208097.htm

    2009 Hummer H3 Solar flare premium
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  8. #8 Re: engine missing and bucking at operating temp 
    GTX Level Member tayl5645's Avatar
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    touche didnt even think about that switching with temps
    2005 GTP Grey

    Custom built Open cone intake, 15% tints all the way around, 7" touchscreen DVD player
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  9. #9 Re: engine missing and bucking at operating temp 
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    I will try to swap them out tonight and see if that helps. Thanks guys I'm running out of ideas
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  10. #10 Re: engine missing and bucking at operating temp 
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    I pulled the plugs and they seem to have a white powder between the electrode and the thread. That seems to be like it is running lean. Does that sound right. I changed the maf and EGR and it runs better but still has a miss when on the gas
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