Thread: Strange rpm wobble and CEL flashing

Results 1 to 11 of 11
  1. #1 Strange rpm wobble and CEL flashing 
    SE Level Member OZZY1123's Avatar
    Join Date
    Jan 2013
    Location
    Red Deer Alberta, Canada
    Posts
    72
    Thanks (Received)
    0
    Likes (Received)
    0
    Dislikes (Received)
    0
    I'm driving a 99 Grand Prix GTP with the 3800 series supercharged engine, the other day I was driving down the highway, not incredibly fast, maybe 150km and my check engine light came on and started flashing. I stopped and started looking for problems under the hood and checked the gas cap. Everything seemed to be fine so I continued driving. Nothing seemed to be incredibly out of whack so i have since let it be. The only thing I have noticed different is that if I punch it, it will rev to about 3100rpm then sit there and keep accelerating, then it kind of drops a bit and takes off to 4000rpm where it sits again the same as at 3000. Today I noticed when it was at the 3000 range the car jerked slightly but nothing that seemed to be a real threat. As I was looking for solutions i found a few suggestions saying it could be an air leak, but it idles fine so I am not sure thats the problem. I have also read it could be spark plugs or coils but I would like to know for sure before spending money on that. I should mention that during the summer it had a problem with sparkplug gap and I had to have it towed as it would not even idle, could this be the problem again?

    Thanks
    Austin
    Reply With Quote  
     

  2. #2 Re: Strange rpm wobble and CEL flashing 
    Turbo is the way to go. Fivefingerdeathpunch's Avatar
    Join Date
    Sep 2009
    Location
    Rogers, MN
    Posts
    21,022
    Thanks (Received)
    21
    Likes (Received)
    45
    Dislikes (Received)
    0
    Flashing SES light means catalyist damage, as in misfires.

    I would try and figure out which cylinders are throwing the mis-fire and go from there. You may have other codes should up aswell.

    SMGPFC Member #1
    Reply With Quote  
     

  3. #3 Re: Strange rpm wobble and CEL flashing 
    Killa Bee Scottydoggs's Avatar
    Join Date
    Aug 2010
    Location
    new jersey
    Posts
    39,919
    Thanks (Received)
    63
    Likes (Received)
    166
    Dislikes (Received)
    5
    get it scanned, see what code/codes your getting.

    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  
     

  4. #4 Re: Strange rpm wobble and CEL flashing 
    GT Level Member 00grandprixgtp's Avatar
    Join Date
    Apr 2009
    Location
    Elkhart
    Posts
    426
    Thanks (Received)
    0
    Likes (Received)
    0
    Dislikes (Received)
    0
    Prob has a cracked plug
    2.4Pulley, Ngk Tr7 plugs, Self tune, Methanol injection
    23.5 deg timing gen v,78mm billet tb , Poly dog mounts, Sd headers
    Zzp s2 intercooler ,UD wp pulley,is2cam,130# springs modded retainers
    P&P heads and lim built trans 3.29 gears harden parts 2500 stall shift kit
    Reply With Quote  
     

  5. #5 Re: Strange rpm wobble and CEL flashing 
    SE Level Member OZZY1123's Avatar
    Join Date
    Jan 2013
    Location
    Red Deer Alberta, Canada
    Posts
    72
    Thanks (Received)
    0
    Likes (Received)
    0
    Dislikes (Received)
    0
    I forgot to mention that the SES light is on constantly until it gets into that 3-4000 rev range for a few seconds then it starts blinking. Is this normal?
    Reply With Quote  
     

  6. #6 Re: Strange rpm wobble and CEL flashing 
    Killa Bee Scottydoggs's Avatar
    Join Date
    Aug 2010
    Location
    new jersey
    Posts
    39,919
    Thanks (Received)
    63
    Likes (Received)
    166
    Dislikes (Received)
    5
    no its not. go to your local parts store and have your car scanned.

    the flashing is bad, its telling you to stop doing what ever your doing. most of the time flashing light is multiple misfires, or a clogged cat.


    it could be as simple as needing tune up real bad.

    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  
     

  7. #7 Re: Strange rpm wobble and CEL flashing 
    SE Level Member OZZY1123's Avatar
    Join Date
    Jan 2013
    Location
    Red Deer Alberta, Canada
    Posts
    72
    Thanks (Received)
    0
    Likes (Received)
    0
    Dislikes (Received)
    0
    Is it ok to drive it like this as long as the light is not flashing? Everything feels fine until its almost wide open
    Reply With Quote  
     

  8. #8 Re: Strange rpm wobble and CEL flashing 
    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 you have no choice but to drive it, baby it, dont make the light flash.

    get it scanned and fixed asap tho. dont let this go for to long. flashing is warning of a catastrophic event happening. aka not good at all.

    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  
     

  9. #9 Re: Strange rpm wobble and CEL flashing 
    GTP Level Member 1ATony's Avatar
    Join Date
    Dec 2009
    Location
    mass
    Posts
    578
    Thanks (Received)
    0
    Likes (Received)
    0
    Dislikes (Received)
    0
    Welcome to the site

    Tony
    1aauto.com
    SALES 888-844-3393
    Shop Here For: Grand Prix Parts
    Reply With Quote  
     

  10. #10 Re: Strange rpm wobble and CEL flashing 
    SE Level Member OZZY1123's Avatar
    Join Date
    Jan 2013
    Location
    Red Deer Alberta, Canada
    Posts
    72
    Thanks (Received)
    0
    Likes (Received)
    0
    Dislikes (Received)
    0
    thanks for the help guys, its going in on tuesday, will report with the problem!
    Reply With Quote  
     

  11. #11 Re: Strange rpm wobble and CEL flashing 
    SE Level Member OZZY1123's Avatar
    Join Date
    Jan 2013
    Location
    Red Deer Alberta, Canada
    Posts
    72
    Thanks (Received)
    0
    Likes (Received)
    0
    Dislikes (Received)
    0
    just fot the car back and turns out it was a misfire on cylinder 3. Plugs were replaced this summer after a gap issue but wires were not and that seemed to be what was causing it. Plug and wires were replaced and everything seems to be good. Thanks for all your help, I am loving it here on the forum!

    Austin
    Reply With Quote  
     

Similar Threads

  1. 2007 GP wobble.....
    By Spike89 in forum Brakes/Suspension/Chassis
    Replies: 26
    Last Post: 11-15-2012, 02:43 PM
  2. front end wobble
    By newmod in forum Brakes/Suspension/Chassis
    Replies: 3
    Last Post: 12-30-2011, 03:08 PM
  3. Help, Death Wobble!
    By Brooks in forum Brakes/Suspension/Chassis
    Replies: 2
    Last Post: 04-13-2011, 05:48 AM
  4. Clunk/wobble?
    By JESSEGOTTA GP GT in forum Brakes/Suspension/Chassis
    Replies: 4
    Last Post: 08-20-2010, 07:27 PM
  5. Got myself some wobble and need help
    By dagger in forum 1997-2007 4 speed Automatic (4T65E) (4T65E-HD)
    Replies: 13
    Last Post: 07-23-2010, 08:05 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
  •