Idle issue when cold

Discussion in '94-95 5.0 - Specific' started by 1994gt, Feb 9, 2015.

  1. 1994gt

    1994gt Member

    Messages:
    115
    Likes Received:
    0
    Joined:
    Sep 21, 2013
    When engine is cold, as in first thing in the morning, the engine idles like it has a mild cam in it. Then after a few minutes it levels out and is fine. Doesn't die or run funny except for the idle. After work I start it in the afternoon and it's fine. Don't remember it doing this last year but who knows. Is this normal electric choke working or is there something else that it could be? Car has BBK cai, 70 mm throttle body, and exhaust. Had a lot of maintenance stuff done before I bought it. I cleaned the iac valve and MAF sensor as well. Any thoughts? Coolant temp sensor??
     
  2. red94

    red94 New Member

    Messages:
    24
    Likes Received:
    0
    Joined:
    Feb 5, 2015
    definitely not normal. I would try cleaning the IAC again. Or maybe time to replace it. It could possibly be the temp sender. Possible to be stuck in the warm position.
     
  3. whiplash473

    whiplash473 Moderator Staff SN95 Supporter

    Messages:
    12,251
    Likes Received:
    1,205
    Joined:
    May 12, 2012
    Location:
    Northern IL
    Sounds like the typical "sn95 idle surge." There's a sticky in here somewhere on how to fix it.


    Sent from bored/stroked iPhone 6 Plus
     
  4. 1994gt

    1994gt Member

    Messages:
    115
    Likes Received:
    0
    Joined:
    Sep 21, 2013
    It only does it first thing in the morning and for about 3-4 minutes then it's fine. Doesn't do it the rest of the day. warmer mornings may even be less than that.
     
  5. red94

    red94 New Member

    Messages:
    24
    Likes Received:
    0
    Joined:
    Feb 5, 2015
    Id swap the temp switch. they are cheap and easy to change.
     
  6. JKady

    JKady Active Member

    Messages:
    266
    Likes Received:
    0
    Joined:
    Mar 20, 2013
    Location:
    Graham, WA
    Put some plugs in it and clean the iac. My car had done this for the whole time I owned it, finally quit being lazy and figured out some geek had put Bosch platinums (seriously some of the worst plugs known to man) in it. Tossed those and put some autolite 25's in, gapped at .048 and she runs like a dream now, hot or cold.
     
  7. 1994gt

    1994gt Member

    Messages:
    115
    Likes Received:
    0
    Joined:
    Sep 21, 2013
    Already did auto lite plugs this past summer along with cap, rotor, and wires. I'll try the coolant sensor and see where that gets me. It's only about $30.