Thread: Misfire, Stumble

Results 1 to 11 of 11
  1. #1 Misfire, Stumble 
    SE Level Member
    Join Date
    Mar 2010
    Location
    Missouri
    Posts
    5
    Thanks (Received)
    0
    Likes (Received)
    0
    Dislikes (Received)
    0
    I have a 2000 GT. It starts just fine but when you go from a stop it stumbles. It stumbles until it gets up to about 45. Runs fine after that. Going up inclines it lacks power and stumbles a lot. The SES light comes on and flashes then goes off. It is on now, the code is P300. I've looked over everything, nothing seems to be wrong on the surface. I've got new plugs and wires I'm putting on. Recently changed the air filter, fuel filter, and pcv valve. Scratching my head.
    Reply With Quote  
     

  2. #2 Re: Misfire, Stumble 
    I live here. SlowNA06's Avatar
    Join Date
    Mar 2010
    Location
    Pennsylvania
    Posts
    5,928
    Thanks (Received)
    0
    Likes (Received)
    0
    Dislikes (Received)
    0
    How's the idle? Frm what I can tell, that's funky/vague to diagnose. Maybe a Tech2 can get some more info. Some easy suggestions that are just good to do anyway: Clean MAF, clean throttlebody, new throttlebody gasket, run a bottle of GM fuel system treatment...
    Reply With Quote  
     

  3. #3 Re: Misfire, Stumble 
    SE Level Member
    Join Date
    May 2010
    Location
    New Jersey
    Posts
    57
    Thanks (Received)
    0
    Likes (Received)
    0
    Dislikes (Received)
    0
    p0300 is a random misfire and the check engine light blinking means catalyst damaging misfire. just change the plugs/ wires and youll be good.
    Reply With Quote  
     

  4. #4 Re: Misfire, Stumble 
    SE Level Member
    Join Date
    Mar 2010
    Location
    Missouri
    Posts
    5
    Thanks (Received)
    0
    Likes (Received)
    0
    Dislikes (Received)
    0
    It idles fine, but at times will stumble or surge. When I turn on the a/c it gets worse. I cleaned the MAF a couple weeks ago.
    Reply With Quote  
     

  5. #5 Re: Misfire, Stumble 
    GTX Level Member stlmo_gtp's Avatar
    Join Date
    Mar 2008
    Location
    St. Louis
    Posts
    1,043
    Thanks (Received)
    0
    Likes (Received)
    0
    Dislikes (Received)
    0
    check wires/plugs/plug gap/ and you may want to get your ICM tested
    Reply With Quote  
     

  6. #6 Re: Misfire, Stumble 
    SE Level Member
    Join Date
    May 2010
    Location
    New Jersey
    Posts
    57
    Thanks (Received)
    0
    Likes (Received)
    0
    Dislikes (Received)
    0
    because the a/c is putting a bigger load on the engine. if you have new plugs and wires put them in.
    Reply With Quote  
     

  7. #7 Re: Misfire, Stumble 
    SE Level Member
    Join Date
    Mar 2010
    Location
    Missouri
    Posts
    5
    Thanks (Received)
    0
    Likes (Received)
    0
    Dislikes (Received)
    0
    I am changing plugs and wires this weekend. Also testing ICM and coils. Thanks for all the advice and help.
    Reply With Quote  
     

  8. #8 Re: Misfire, Stumble 
    SE Level Member
    Join Date
    Mar 2010
    Location
    Missouri
    Posts
    5
    Thanks (Received)
    0
    Likes (Received)
    0
    Dislikes (Received)
    0
    Well I changed plugs and wires. It still was the same. I had the ICM checked. That was it. Repalced it and the coils. Runs real good. Thanks for all the help.
    Reply With Quote  
     

  9. #9 Re: Misfire, Stumble 
    SE Level Member
    Join Date
    May 2010
    Location
    New Jersey
    Posts
    57
    Thanks (Received)
    0
    Likes (Received)
    0
    Dislikes (Received)
    0
    ah stupid ignition module. good to see you got it fixed.
    Reply With Quote  
     

  10. #10 Re: Misfire, Stumble 
    SE Level Member
    Join Date
    Oct 2009
    Location
    PA
    Posts
    27
    Thanks (Received)
    0
    Likes (Received)
    0
    Dislikes (Received)
    0
    Quote Originally Posted by Bill3256 View Post
    Well I changed plugs and wires. It still was the same. I had the ICM checked. That was it. Repalced it and the coils. Runs real good. Thanks for all the help.
    Just curious, how do you test the ICM? Is this something you need special equipment for?
    98 GT stock
    Reply With Quote  
     

  11. #11 Re: Misfire, Stumble 
    GT Level Member clevelandfan's Avatar
    Join Date
    Mar 2010
    Location
    ohio
    Posts
    188
    Thanks (Received)
    0
    Likes (Received)
    0
    Dislikes (Received)
    0
    sorry i was late on this, but i was gonna say icm, or coils right away. i had this happen a couple times at work, seeing as i work at advance auto. guess its not that uncommon to go on these motors
    97' Grand Prix. Blurring the lines between SE, and GT
    Reply With Quote  
     

Similar Threads

  1. Hesitation and Stumble
    By Bill3256 in forum 3.8L V6 Naturally Aspirated (L36)(L26)
    Replies: 1
    Last Post: 05-08-2010, 06:54 PM
  2. Power loss / slight stumble @ WOT
    By Wilford in forum General Tech Discussion
    Replies: 2
    Last Post: 10-25-2009, 08:05 AM
  3. Engine Stumble
    By briggsracing23 in forum 3.8L V6 Naturally Aspirated (L36)(L26)
    Replies: 3
    Last Post: 08-25-2009, 09:02 AM
  4. Rough Idle/Stumble after LIM Install
    By hesersypb in forum 3.8L V6 Naturally Aspirated (L36)(L26)
    Replies: 7
    Last Post: 08-12-2009, 08:27 AM
  5. Stumble at idle
    By lowdeuce in forum 3.8L V6 Supercharged (L67)(L32)
    Replies: 14
    Last Post: 11-21-2008, 10:26 PM
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
  •