Thread: pulsating noise at idle or while driving.

Results 1 to 8 of 8
  1. #1 pulsating noise at idle or while driving. 
    SE Level Member 08 gp lvr's Avatar
    Join Date
    Nov 2011
    Location
    north bay, ontario
    Posts
    122
    Thanks (Received)
    0
    Likes (Received)
    0
    Dislikes (Received)
    0
    I'm hoping to get some insight here, never had this happen before. But when the car is running I can hear a pulsating noise, not overly loud but its on n off every 3 seconds. There is no change in rpm at all. No new repairs done recently. But last night my tank was on empty and I a strong odor of gas in the car that lasted about a minute then went away. That was the first time this has happened. Any thoughts or suggestions? Thanks guys.
    Reply With Quote  
     

  2. #2 Re: pulsating noise at idle or while driving. 
    GrandPrix Junkie
    Join Date
    Oct 2009
    Location
    St. Louis
    Posts
    4,793
    Thanks (Received)
    18
    Likes (Received)
    76
    Dislikes (Received)
    0
    Could be the EBCM pulsing the ABS pump as a self check. Does it constantly do it or only for a few times?
    Reply With Quote  
     

  3. #3 Re: pulsating noise at idle or while driving. 
    SE Level Member 08 gp lvr's Avatar
    Join Date
    Nov 2011
    Location
    north bay, ontario
    Posts
    122
    Thanks (Received)
    0
    Likes (Received)
    0
    Dislikes (Received)
    0
    It constantly does it. But there no surge on the engine no drop or rise in rpm and it does it when I'm stopped or driving. I don't believe its my abs.
    Reply With Quote  
     

  4. #4 Re: pulsating noise at idle or while driving. 
    GrandPrix Junkie
    Join Date
    Oct 2009
    Location
    St. Louis
    Posts
    4,793
    Thanks (Received)
    18
    Likes (Received)
    76
    Dislikes (Received)
    0
    Since it does it while running in park then pop the hood and take a listen. Since it does it every 3 seconds it would probably be easy to pinpoint.
    Reply With Quote  
     

  5. #5 Re: pulsating noise at idle or while driving. 
    SE Level Member 08 gp lvr's Avatar
    Join Date
    Nov 2011
    Location
    north bay, ontario
    Posts
    122
    Thanks (Received)
    0
    Likes (Received)
    0
    Dislikes (Received)
    0
    I tracked the noise. It doesn't do it all the time but its behind the blower heater controls. Gonna hv to take it apart and investigate. Any info before I do would be appreciated.
    Reply With Quote  
     

  6. #6 Re: pulsating noise at idle or while driving. 
    Killa Bee Scottydoggs's Avatar
    Join Date
    Aug 2010
    Location
    new jersey
    Posts
    39,921
    Thanks (Received)
    63
    Likes (Received)
    166
    Dislikes (Received)
    5
    could be a blend door actuator that twitching back and fourth.

    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: pulsating noise at idle or while driving. 
    SE Level Member 08 gp lvr's Avatar
    Join Date
    Nov 2011
    Location
    north bay, ontario
    Posts
    122
    Thanks (Received)
    0
    Likes (Received)
    0
    Dislikes (Received)
    0
    Thanks for ur reply. If I understand correctly, behind that control there's vacum lines?? My question is if I take the contril part off while its running, can I risk screwin sumthing up?? I've always done my own work and pretty good at it. But I never did pull out the tstat controls before.
    Reply With Quote  
     

  8. #8 Re: pulsating noise at idle or while driving. 
    Killa Bee Scottydoggs's Avatar
    Join Date
    Aug 2010
    Location
    new jersey
    Posts
    39,921
    Thanks (Received)
    63
    Likes (Received)
    166
    Dislikes (Received)
    5
    no vac lines on the blend door actuators. heres the how to. http://www.grandprixforums.net/showt...door+actuators

    you can open everything up and put your finger on the moving part of the actuator to see if its twitching around. pass glove box is the easy one to get to.

    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  
     

Similar Threads

  1. knocking noise when driving?
    By nickgpgt in forum General Grand Prix Discussion
    Replies: 10
    Last Post: 09-18-2013, 06:32 PM
  2. humming noise while driving
    By monfotrac in forum Brakes/Suspension/Chassis
    Replies: 1
    Last Post: 08-11-2010, 12:28 PM
  3. Grinding noise when driving around
    By littlerobinson75 in forum Brakes/Suspension/Chassis
    Replies: 2
    Last Post: 08-08-2010, 10:34 AM
  4. Pulsating idle
    By slappy in forum 3.4L V6 (LQ1) DOHC
    Replies: 5
    Last Post: 05-30-2010, 09:11 PM
  5. Throttle bounces at idle AND while driving
    By navillus in forum General Tech Discussion
    Replies: 6
    Last Post: 05-30-2010, 04:48 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
  •