Thread: Random CEL light

Results 1 to 6 of 6
  1. #1 Random CEL light 
    SE Level Member
    Join Date
    Aug 2012
    Location
    Arkansas
    Posts
    8
    Thanks (Received)
    0
    Likes (Received)
    0
    Dislikes (Received)
    0
    2000 Grand Prix GTP 184xxx miles

    Guys I need some help here!
    When the car is just idling, whether Im sitting in the driveway or at a light there is no CEL, when i accelerate or push on the gas pedal after about 30 seconds the CL starts flashing. When i go back to idle after a minute or two the light goes off. Checked it with the scanner and it shows misfire in cylinder 3. Car doesn't run rough so i don't think it really is misfiring. My scanner wont do live data so I can't look at that but i have pulled the wire and the plug and it is firing like it supposed to. I have swapped and replaced plugs, wires, coil and injector and it is still doing the same thing. Thought it might be a manifold gasket but it doesnt make sense that it would go away at idle.

    Any ideas?
    Reply With Quote  
     

  2. #2 Re: Random CEL light 
    Killa Bee Scottydoggs's Avatar
    Join Date
    Aug 2010
    Location
    new jersey
    Posts
    39,919
    Thanks (Received)
    63
    Likes (Received)
    166
    Dislikes (Received)
    5
    either you need a tune up, or the cats clogged.

    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
    Reply With Quote  
     

  3. #3 Re: Random CEL light 
    SE Level Member
    Join Date
    Aug 2012
    Location
    Arkansas
    Posts
    8
    Thanks (Received)
    0
    Likes (Received)
    0
    Dislikes (Received)
    0
    Well I've done plugs and wires and replaced that coil and that injector on #3 so I guess I'll check the cat. Thanks
    Reply With Quote  
     

  4. #4 Re: Random CEL light 
    Killa Bee Scottydoggs's Avatar
    Join Date
    Aug 2010
    Location
    new jersey
    Posts
    39,919
    Thanks (Received)
    63
    Likes (Received)
    166
    Dislikes (Received)
    5
    if its been feeling down on power its the cat for sure. if you got a temp laser you can drive it and then see the pre and post cat pipe temps. if post is way cooler the cats bad.

    or you can drive it late at night and drive it some what hard, not full on beating it tho cause the flashing cel means catastrophic event is happening. then pull over and look under the cat to see if the cat and down pipe are glowing red.

    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
    Reply With Quote  
     

  5. #5 Re: Random CEL light 
    GrandPrix Junkie
    Join Date
    Oct 2009
    Location
    St. Louis
    Posts
    4,783
    Thanks (Received)
    18
    Likes (Received)
    76
    Dislikes (Received)
    0
    Here's some additional reading on your issue--> Cylinder 3 misfire Tried everything I can think of

    Also, what did the electrode look like on the plug that you originally pulled out of #3? Gap still open? I also assume you run at least 91 octane fuel that the S/C cars require.
    Reply With Quote  
     

  6. #6 Re: Random CEL light 
    SE Level Member
    Join Date
    Aug 2012
    Location
    Arkansas
    Posts
    8
    Thanks (Received)
    0
    Likes (Received)
    0
    Dislikes (Received)
    0
    Plugs all pretty much looked the same when I did the TU. 91 or 93
    Reply With Quote  
     

Similar Threads

  1. Random ABS light, no codes, all speed sensors reporting.
    By buickman104 in forum Brakes/Suspension/Chassis
    Replies: 8
    Last Post: 03-11-2017, 09:09 AM
  2. After transmission swap no Head Unit Display and random ABS light
    By buickman104 in forum Audio, Security & Visual Electronics
    Replies: 0
    Last Post: 01-05-2016, 11:17 AM
  3. '08 GXP Random Air Bag light
    By HeavyChevy in forum General Grand Prix Discussion
    Replies: 8
    Last Post: 07-28-2015, 09:40 PM
  4. Random air bag light
    By stealthee in forum 04+ Specifics
    Replies: 14
    Last Post: 10-18-2011, 05:25 AM
  5. Security light comes on at random
    By Andrew_99GTP in forum Off Topic Discussion
    Replies: 0
    Last Post: 05-19-2008, 09:44 PM
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
  •