Thread: Wont start without giving it gas

Results 1 to 8 of 8
  1. #1 Wont start without giving it gas 
    SE Level Member sn95gt50's Avatar
    Join Date
    Jul 2008
    Posts
    65
    Thanks (Received)
    0
    Likes (Received)
    2
    Dislikes (Received)
    0
    2008 Grand Prix
    Base Model
    3.8L Series III

    This does not happen all of the time, but, occasionally, when I try to start it, turn the key and it will try to start but won't. If give it just a little throttle it will start up every time.

    A few things that I am guessing would be:
    Fuel pump
    Fuel Filter
    Idle air bypass

    Is the pump filter a single unit?

    Wondering if anyone else has had this experience and could help me rule somethings out before throwing money at it.

    Thanks,
    John
    Reply With Quote  
     

  2. #2 Re: Wont start without giving it gas 
    SE Level Member sn95gt50's Avatar
    Join Date
    Jul 2008
    Posts
    65
    Thanks (Received)
    0
    Likes (Received)
    2
    Dislikes (Received)
    0
    FYI 130k miles, fuel pump filter IAB all original
    Reply With Quote  
     

  3. #3 Re: Wont start without giving it gas 
    Killa Bee Scottydoggs's Avatar
    Join Date
    Aug 2010
    Location
    new jersey
    Posts
    39,919
    Thanks (Received)
    63
    Likes (Received)
    166
    Dislikes (Received)
    5
    it happen on cold starts only? if so then the iac could be 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  
     

  4. #4 Re: Wont start without giving it gas 
    SE Level Member
    Join Date
    May 2020
    Location
    Pittsburgh
    Posts
    59
    Thanks (Received)
    6
    Likes (Received)
    8
    Dislikes (Received)
    0
    Or if it's hot starts only I would investigate the Fuel pressure Regulator.

    Does your coolant temp gauge work properly?

    Pinpointing a common denominator in these cases is very helpful
    Reply With Quote  
     

  5. #5 Re: Wont start without giving it gas 
    Killa Bee Scottydoggs's Avatar
    Join Date
    Aug 2010
    Location
    new jersey
    Posts
    39,919
    Thanks (Received)
    63
    Likes (Received)
    166
    Dislikes (Received)
    5
    Quote Originally Posted by onxy View Post
    Or if it's hot starts only I would investigate the Fuel pressure Regulator.

    Does your coolant temp gauge work properly?

    Pinpointing a common denominator in these cases is very helpful
    pretty sure the fpr is in the gas tank on a 08, not on the rail like the older cars. and those dont seem to fail. at least ive never heard of one failing.

    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  
     

  6. #6 Re: Wont start without giving it gas 
    SE Level Member
    Join Date
    May 2020
    Location
    Pittsburgh
    Posts
    59
    Thanks (Received)
    6
    Likes (Received)
    8
    Dislikes (Received)
    0
    Quote Originally Posted by Scottydoggs View Post
    pretty sure the fpr is in the gas tank on a 08, not on the rail like the older cars. and those dont seem to fail. at least ive never heard of one failing.
    that's highly likely. I can't seem to remember a FPR on a l26 rail.

    In any case, it sounds like a fuel mixture issue. Either too much/too little fuel, or it's having a hard time metering air. Data logs would help, or ability to monitor live data, otherwise it's just guesses.
    Reply With Quote  
     

  7. #7 Re: Wont start without giving it gas 
    SE Level Member sn95gt50's Avatar
    Join Date
    Jul 2008
    Posts
    65
    Thanks (Received)
    0
    Likes (Received)
    2
    Dislikes (Received)
    0
    I can only remember it happening on cold start, will check with daughter.

    You mention data logging, the only thing that I have is a Bluetooth OBD2 reader, it has some data logging, what should I log, or is this not available?

    Thanks for all input.
    Reply With Quote  
     

  8. #8 Re: Wont start without giving it gas 
    Killa Bee Scottydoggs's Avatar
    Join Date
    Aug 2010
    Location
    new jersey
    Posts
    39,919
    Thanks (Received)
    63
    Likes (Received)
    166
    Dislikes (Received)
    5
    id find a cheap iac valve "idle air control" for cheap on ebay and toss it on the tb. local parts store will want retard money for it. ebay 20 bucks or so.

    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. 1993 grand prix 3.4 wont start have to pump gas to start
    By lookout in forum 3.4L V6 (LQ1) DOHC
    Replies: 3
    Last Post: 10-27-2015, 05:45 AM
  2. Car turns over, but won't start without giving it some gas
    By K Kraziee in forum General Tech Discussion
    Replies: 27
    Last Post: 12-17-2013, 12:56 AM
  3. Topped swapped 06 GP now wont start and scan tool wont comm with ECM
    By jbrltoliver in forum 3.8L V6 Supercharged (L67)(L32)
    Replies: 15
    Last Post: 05-31-2013, 08:36 AM
  4. 1998 grand prix gt wont randomly wont start!!
    By franklin829 in forum General Tech Discussion
    Replies: 2
    Last Post: 01-18-2011, 01:26 PM
  5. Car wont fully start without giving it gas... wtf
    By Piggy in forum 3.8L V6 Naturally Aspirated (L36)(L26)
    Replies: 8
    Last Post: 06-15-2009, 05:41 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
  •