Thread: engine missing and bucking at operating temp

Results 1 to 10 of 10
  1. #1 engine missing and bucking at operating temp 
    SE Level Member
    Join Date
    Feb 2011
    Location
    london
    Posts
    5
    Thanks (Received)
    0
    Likes (Received)
    0
    Dislikes (Received)
    0
    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.
    Reply With Quote  
     

  2. #2 Re: engine missing and bucking at operating temp 
    GrandPrix Junkie
    Join Date
    Oct 2009
    Location
    St. Louis
    Posts
    4,749
    Thanks (Received)
    18
    Likes (Received)
    76
    Dislikes (Received)
    0
    Have you cleaned the MAF? I'd start there and see what you get. Also, may want to check for vac. leaks.

    Jay
    Reply With Quote  
     

  3. #3 Re: engine missing and bucking at operating temp 
    SE Level Member
    Join Date
    Feb 2011
    Location
    london
    Posts
    5
    Thanks (Received)
    0
    Likes (Received)
    0
    Dislikes (Received)
    0
    I just tried swapping out he MAF and it did not seem to make a difference
    Reply With Quote  
     

  4. #4 Re: engine missing and bucking at operating temp 
    SE Level Member
    Join Date
    Feb 2011
    Location
    london
    Posts
    5
    Thanks (Received)
    0
    Likes (Received)
    0
    Dislikes (Received)
    0
    Anyone have any other ideas
    Reply With Quote  
     

  5. #5 Re: engine missing and bucking at operating temp 
    GTX Level Member EJOUIE's Avatar
    Join Date
    Mar 2010
    Location
    Newnan, GA
    Posts
    1,193
    Thanks (Received)
    0
    Likes (Received)
    1
    Dislikes (Received)
    0
    ICM?
    97 GT white 4 door-SOLD

    Cherry 2005 Impala LS- Front and Rear GMPP Strut Tower Braces
    Reply With Quote  
     

  6. #6 Re: engine missing and bucking at operating temp 
    GTX Level Member tayl5645's Avatar
    Join Date
    Jul 2010
    Location
    Michigan
    Posts
    1,022
    Thanks (Received)
    0
    Likes (Received)
    0
    Dislikes (Received)
    0
    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
    Reply With Quote  
     

  7. #7 Re: engine missing and bucking at operating temp 
    GTP Level Member 01gpgt01's Avatar
    Join Date
    Apr 2010
    Location
    Hagerstown,Md
    Posts
    1,933
    Thanks (Received)
    0
    Likes (Received)
    0
    Dislikes (Received)
    0
    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
    Reply With Quote  
     

  8. #8 Re: engine missing and bucking at operating temp 
    GTX Level Member tayl5645's Avatar
    Join Date
    Jul 2010
    Location
    Michigan
    Posts
    1,022
    Thanks (Received)
    0
    Likes (Received)
    0
    Dislikes (Received)
    0
    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
    Reply With Quote  
     

  9. #9 Re: engine missing and bucking at operating temp 
    SE Level Member
    Join Date
    Feb 2011
    Location
    london
    Posts
    5
    Thanks (Received)
    0
    Likes (Received)
    0
    Dislikes (Received)
    0
    I will try to swap them out tonight and see if that helps. Thanks guys I'm running out of ideas
    Reply With Quote  
     

  10. #10 Re: engine missing and bucking at operating temp 
    SE Level Member
    Join Date
    Feb 2011
    Location
    london
    Posts
    5
    Thanks (Received)
    0
    Likes (Received)
    0
    Dislikes (Received)
    0
    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
    Reply With Quote  
     

Similar Threads

  1. Engine Coolant Temp Fluctuating
    By webracin in forum How To Write-Ups/Tech Tips
    Replies: 40
    Last Post: 07-29-2013, 04:33 PM
  2. Can't get the car to stay started at operating temp.
    By afallucco in forum 3.8L V6 Supercharged (L67)(L32)
    Replies: 5
    Last Post: 10-25-2010, 10:20 AM
  3. Operating Temp????
    By reaper55 in forum 3.8L V6 Naturally Aspirated (L36)(L26)
    Replies: 6
    Last Post: 04-12-2010, 08:56 PM
  4. Engine temp question
    By toolguy in forum 3.8L V6 Naturally Aspirated (L36)(L26)
    Replies: 6
    Last Post: 11-23-2009, 09:42 AM
  5. Missing an engine in the W-Body Tech forum
    By RareGMFan in forum Forum Bugs/Suggestions
    Replies: 3
    Last Post: 12-16-2008, 11:18 AM
Tags for this Thread

View Tag Cloud

Bookmarks
Bookmarks
Posting Permissions
  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •