Thread: Car pulses at idle like a cam

Results 1 to 19 of 19
  1. #1 Car pulses at idle like a cam 
    SE Level Member
    Join Date
    Feb 2012
    Location
    Springfield Missouri
    Posts
    79
    Thanks (Received)
    0
    Likes (Received)
    0
    Dislikes (Received)
    0
    So here recently my car is pulsing at idle when I open the hood I can a fast ticking noise and then the sound of the car retarding the timing. I pulled codes and the only code I got was that the car was running to lean which was code P0171 I feel like thats a really generic code. My car is a 1998 grand prix GT N/A 3.8 Series II. The only modifications I have done to it is a cold air intake and I replaced the resonator with a Cherry Bomb glass pack. Oh and the MAF is hooked up to the CAI any help please?
    Reply With Quote  
     

  2. #2 Re: Car pulses at idle like a cam 
    GTP Level Member L36 Killer's Avatar
    Join Date
    Jul 2012
    Location
    Harrisburg, Pennsylvania, United States
    Posts
    597
    Thanks (Received)
    0
    Likes (Received)
    0
    Dislikes (Received)
    0
    "SHELLY" GRAND PRIX GT 02. SLP HEADERS & EXHAUST, K&N CAI, BMR REAR SUSPENSION AND STRUT BRACES, 180 T-STAT, AGX STRUTS, EIBACH SPRINGS, OVERKILL PCM, YELLA TERRA 1.7 ROCKERS, GT1 CAM, SEXMAN PORTED & POLISHED HEADS, STAGE 2 PORTED TB
    Reply With Quote  
     

  3. #3 Re: Car pulses at idle like a cam 
    SE Level Member
    Join Date
    Feb 2012
    Location
    Springfield Missouri
    Posts
    79
    Thanks (Received)
    0
    Likes (Received)
    0
    Dislikes (Received)
    0
    ehh somewhat mine seems like more of spark tick though
    Reply With Quote  
     

  4. #4 Re: Car pulses at idle like a cam 
    GTP Level Member L36 Killer's Avatar
    Join Date
    Jul 2012
    Location
    Harrisburg, Pennsylvania, United States
    Posts
    597
    Thanks (Received)
    0
    Likes (Received)
    0
    Dislikes (Received)
    0
    How many miles? Any trouble shooting done yet? your MAF is IN the CAI?
    "SHELLY" GRAND PRIX GT 02. SLP HEADERS & EXHAUST, K&N CAI, BMR REAR SUSPENSION AND STRUT BRACES, 180 T-STAT, AGX STRUTS, EIBACH SPRINGS, OVERKILL PCM, YELLA TERRA 1.7 ROCKERS, GT1 CAM, SEXMAN PORTED & POLISHED HEADS, STAGE 2 PORTED TB
    Reply With Quote  
     

  5. #5 Re: Car pulses at idle like a cam 
    SE Level Member
    Join Date
    Feb 2012
    Location
    Springfield Missouri
    Posts
    79
    Thanks (Received)
    0
    Likes (Received)
    0
    Dislikes (Received)
    0
    well the original chassis miles is 298k but the engine was rebuilt awhile back so I would say that it has 100k at the most.
    Reply With Quote  
     

  6. #6 Re: Car pulses at idle like a cam 
    SE Level Member
    Join Date
    Feb 2012
    Location
    Springfield Missouri
    Posts
    79
    Thanks (Received)
    0
    Likes (Received)
    0
    Dislikes (Received)
    0
    And the MAF is on the tubing of the CAI
    Reply With Quote  
     

  7. #7 Re: Car pulses at idle like a cam 
    SE Level Member
    Join Date
    Feb 2012
    Location
    Springfield Missouri
    Posts
    79
    Thanks (Received)
    0
    Likes (Received)
    0
    Dislikes (Received)
    0
    Reply With Quote  
     

  8. #8 Re: Car pulses at idle like a cam 
    GTP Level Member L36 Killer's Avatar
    Join Date
    Jul 2012
    Location
    Harrisburg, Pennsylvania, United States
    Posts
    597
    Thanks (Received)
    0
    Likes (Received)
    0
    Dislikes (Received)
    0
    Did this start after you upgrades? Have you had it tuned since the MAF was put into the tube?
    ?
    "SHELLY" GRAND PRIX GT 02. SLP HEADERS & EXHAUST, K&N CAI, BMR REAR SUSPENSION AND STRUT BRACES, 180 T-STAT, AGX STRUTS, EIBACH SPRINGS, OVERKILL PCM, YELLA TERRA 1.7 ROCKERS, GT1 CAM, SEXMAN PORTED & POLISHED HEADS, STAGE 2 PORTED TB
    Reply With Quote  
     

  9. #9 Re: Car pulses at idle like a cam 
    SE Level Member
    Join Date
    Feb 2012
    Location
    Springfield Missouri
    Posts
    79
    Thanks (Received)
    0
    Likes (Received)
    0
    Dislikes (Received)
    0
    no tuning has been done. I do not no how to tune nor do I know where to get that done at any help is appreciated!
    Reply With Quote  
     

  10. #10 Re: Car pulses at idle like a cam 
    GTP Level Member FriboRage's Avatar
    Join Date
    Jun 2009
    Location
    Pennsylvania
    Posts
    915
    Thanks (Received)
    8
    Likes (Received)
    13
    Dislikes (Received)
    0
    You dont need to tune for a cold air intake.
    --------------------------------------------------------------------------------
    2004 Grand Prix GTP Comp G: Intake, F+R plogs + downpipe, 1.7 YT Rollers, Overkill, F-body front brakes, drilled/slotted r1 concept rotors.
    Sport Edition Kv5 18x8
    Reply With Quote  
     

  11. #11 Re: Car pulses at idle like a cam 
    GTP Level Member L36 Killer's Avatar
    Join Date
    Jul 2012
    Location
    Harrisburg, Pennsylvania, United States
    Posts
    597
    Thanks (Received)
    0
    Likes (Received)
    0
    Dislikes (Received)
    0
    My advice would be to go back to the stock MAF and see if the code continues. Then get into the chat here and find someone who is in your area that tunes. My GUESS is that's your problem. But it's just a guess
    "SHELLY" GRAND PRIX GT 02. SLP HEADERS & EXHAUST, K&N CAI, BMR REAR SUSPENSION AND STRUT BRACES, 180 T-STAT, AGX STRUTS, EIBACH SPRINGS, OVERKILL PCM, YELLA TERRA 1.7 ROCKERS, GT1 CAM, SEXMAN PORTED & POLISHED HEADS, STAGE 2 PORTED TB
    Reply With Quote  
     

  12. #12 Re: Car pulses at idle like a cam 
    Killa Bee Scottydoggs's Avatar
    Join Date
    Aug 2010
    Location
    new jersey
    Posts
    39,927
    Thanks (Received)
    63
    Likes (Received)
    166
    Dislikes (Received)
    5
    dont you mean the ait sensor in in the intake tube? i dont see a maf, just the wires to a ait.

    you maf should be sitting on top of the TB, under the engine cover.


    if you do have a maf on the other side of the tube, you may want to put that back the way it should be if you cant tune it.

    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  
     

  13. #13 Re: Car pulses at idle like a cam 
    SE Level Member
    Join Date
    Feb 2012
    Location
    Springfield Missouri
    Posts
    79
    Thanks (Received)
    0
    Likes (Received)
    0
    Dislikes (Received)
    0
    My apoligies I was referencing the ait sensor yes the MAF is attached
    Reply With Quote  
     

  14. #14 Re: Car pulses at idle like a cam 
    I live here. SlowNA06's Avatar
    Join Date
    Mar 2010
    Location
    Pennsylvania
    Posts
    5,928
    Thanks (Received)
    0
    Likes (Received)
    0
    Dislikes (Received)
    0
    You have a huge vacuum leak. Make sure your EGR is closed at idle. Check all vacuum lines and connections.
    Irridium spark plugs last 100k mi and work just as well as copper. Copper is a waste on N/A and only lasts 15k mi. Don't use Platinum.
    Use 195* tstat unless you can thoroughly explain why not; 99.9% don't need a lower temp.
    Almost any oil filter, ever, is of higher quality than ACDelco. Spend $6+.
    Reply With Quote  
     

  15. #15 Re: Car pulses at idle like a cam 
    Killa Bee Scottydoggs's Avatar
    Join Date
    Aug 2010
    Location
    new jersey
    Posts
    39,927
    Thanks (Received)
    63
    Likes (Received)
    166
    Dislikes (Received)
    5
    i did my lim today and busted a vac line, the idle was jumping 150 to 200 rpm's, up and down. wanted to stall out, head lights got dim when in gear at idle.

    get a can a carb cleaner, and spray all the lines and line ends, when the idle jumps up when you spray, the leak is in that area. just found mine like that tonight.

    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  
     

  16. #16 Re: Car pulses at idle like a cam 
    GTP Level Member L36 Killer's Avatar
    Join Date
    Jul 2012
    Location
    Harrisburg, Pennsylvania, United States
    Posts
    597
    Thanks (Received)
    0
    Likes (Received)
    0
    Dislikes (Received)
    0
    Quote Originally Posted by scottydoggs View Post
    i did my lim today and busted a vac line, the idle was jumping 150 to 200 rpm's, up and down. wanted to stall out, head lights got dim when in gear at idle.

    get a can a carb cleaner, and spray all the lines and line ends, when the idle jumps up when you spray, the leak is in that area. just found mine like that tonight.
    Where did it end up being at?
    "SHELLY" GRAND PRIX GT 02. SLP HEADERS & EXHAUST, K&N CAI, BMR REAR SUSPENSION AND STRUT BRACES, 180 T-STAT, AGX STRUTS, EIBACH SPRINGS, OVERKILL PCM, YELLA TERRA 1.7 ROCKERS, GT1 CAM, SEXMAN PORTED & POLISHED HEADS, STAGE 2 PORTED TB
    Reply With Quote  
     

  17. #17 Re: Car pulses at idle like a cam 
    Killa Bee Scottydoggs's Avatar
    Join Date
    Aug 2010
    Location
    new jersey
    Posts
    39,927
    Thanks (Received)
    63
    Likes (Received)
    166
    Dislikes (Received)
    5
    i broke the T under my snout. and the line on the front (bumper side) of the TB, it goes to the back of the engine, it snapped where it bends, it lays under the wire harness that runs front to back and lays on the sc.

    pretty sure im picking up a set of T's and new rubber vac lines. its all so brittle, you look at it hard it breaks.

    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  
     

  18. #18 Re: Car pulses at idle like a cam 
    GrandPrix Junkie ItHurtz's Avatar
    Join Date
    Feb 2011
    Location
    Antioch, IL
    Posts
    3,524
    Thanks (Received)
    4
    Likes (Received)
    17
    Dislikes (Received)
    2
    i can pull the vac line from the tbody to the evap and get the cam affect. no other line gives me the "cam".
    2000 GTPT Sold-brandonhall10 built trans
    2009 Challenger SRT8
    http://www.grandprixforums.net/threa...uestion.....no
    Expert at being gay.
    Reply With Quote  
     

  19. #19 Re: Car pulses at idle like a cam 
    SE Level Member
    Join Date
    Feb 2012
    Location
    Springfield Missouri
    Posts
    79
    Thanks (Received)
    0
    Likes (Received)
    0
    Dislikes (Received)
    0
    Will have to check these tommoro! I replaced my fuel filter today hoping that was part of the problem and it wasnt but I needed to replace it anyways so no worries lol.
    Reply With Quote  
     

Similar Threads

  1. Rough Idle with intermittent idle miss
    By 99GTPMLA in forum 3.8L V6 Supercharged (L67)(L32)
    Replies: 10
    Last Post: 08-09-2012, 12:12 PM
  2. Idle is going up & down... sometimes !
    By 9ordohz in forum General Tech Discussion
    Replies: 3
    Last Post: 03-25-2011, 01:30 PM
  3. Won't idle; missing above idle if you can get it started
    By jrece in forum 3.8L V6 Naturally Aspirated (L36)(L26)
    Replies: 5
    Last Post: 02-27-2011, 11:24 PM
  4. Running rich at idle, causing idle issues.
    By matt5112 in forum 3.8L V6 Supercharged (L67)(L32)
    Replies: 26
    Last Post: 06-22-2010, 09:16 PM
  5. High / Fast Idle - Idle Air Control motor?
    By porshuh in forum 3.8L V6 Supercharged (L67)(L32)
    Replies: 0
    Last Post: 07-30-2009, 11:28 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
  •