Thread: 2008 Grand Prix rough start

Results 1 to 3 of 3
  1. #1 2008 Grand Prix rough start 
    SE Level Member clevy's Avatar
    Join Date
    May 2014
    Location
    S.E. Iowa
    Posts
    9
    Thanks (Received)
    0
    Likes (Received)
    0
    Dislikes (Received)
    0
    Chats
    0
    Hi there, so I recently bought a 2008 GP and it has been periodically starting pretty rough and some of the time it will die. After it dies it starts very rough. I'm not real sure where to start, MAF? There is no CEL. Car has 140k miles on it
    Reply With Quote  
     

  2. #2 Re: 2008 Grand Prix rough start 
    GT Level Member
    Join Date
    May 2012
    Location
    Bloomington, IN
    Posts
    171
    Thanks (Received)
    0
    Likes (Received)
    0
    Dislikes (Received)
    0
    Chats
    16
    Sounds like it might be the CPS or crankshaft position sensor. Just by your description, it would fit the problem, however, obviously it's not a certainty that's what the problem is. But if I were you and had just bought a used GP without records I'd replace it anyway. One of those simple sensors that can strand you on the highway when it goes bad. BUT, if you do buy one, get an ACDelco and not some Ebay knock off, I got burned on buying off brand sensors, never again. If you're comfortable wrenching, its not hard to do. Shouldn't take you more than an hour if its your first time doing this repair.
    Reply With Quote  
     

  3. #3 Re: 2008 Grand Prix rough start 
    GrandPrix Junkie
    Join Date
    Oct 2009
    Location
    St. Louis
    Posts
    4,724
    Thanks (Received)
    18
    Likes (Received)
    75
    Dislikes (Received)
    0
    Chats
    0
    Pull the throttle body and clean it inside and out, likely covered in carbon. Clean the MAF with the correct MAF cleaner (not brake cleaner). New plugs and wires if unknown when (if) they were ever changed. Stock plugs go for 100K miles then change out.
    Reply With Quote  
     

Similar Threads

  1. 06 Base Rough Start with Auto Start
    By jenebo in forum 04+ Specifics
    Replies: 4
    Last Post: 08-30-2016, 11:24 AM
  2. 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
  3. 02 Grand Prix Rough Idle
    By trailshredder in forum 3.8L V6 Naturally Aspirated (L36)(L26)
    Replies: 14
    Last Post: 01-07-2015, 05:47 PM
  4. Remote start on a 2008 Grand Prix GXP
    By duelgrandprix in forum Introductions/Noob Questions
    Replies: 4
    Last Post: 10-07-2011, 02:52 PM
  5. 2008 Grand Prix no start issue
    By supernac in forum General Tech Discussion
    Replies: 3
    Last Post: 08-22-2010, 11:57 AM
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
  •