Engine reving up and down when coming to a stop

Discussion in 'General Motoring' started by Ben, Nov 10, 2004.

  1. Ben

    Ben Guest

    Today.. All of a sudden the engine wouldn't idle when stopped.. It would rev
    up and down... It was strange.. It happened to me once before and I noticed
    it happens when I run the AC... After I turn off the AC and put it in
    neutral and stablize the idle.. It will idle fine... Very strange.. The only
    thing I can think of is the AC idle control or some relay going bad...
    Anyone else with this problem and any ideas how to fix it..

    It is a 96 SL2

    Thanks,

    Ben
     
    Ben, Nov 10, 2004
    #1
  2. Ben

    B. Peg Guest

    Maybe the throttle control motor (looks like a black solenoid) plunger
    mounted on the side of the throttle body is carboned up. Toothbrush and
    throttlebody cleaner are the Rx after pulling the small Torx screws holding
    it in come out.

    B~
     
    B. Peg, Nov 11, 2004
    #2

  3. At that point, it's best to remove the entire assembly and give it a
    good cleaning with throttle body cleaner. Don't use carb cleaner, even
    though it's cheaper. Believe it or not, the TB cleaner really is a LOT
    better.

    The TB comes out with 2 10mm bolts. Don't kill the gasket :)

    Remove the sensors and clean clean clean. I bet it's really dirty in
    there.

    Once you put it back, give everything a lookover for any cracked,
    rotted, or missing vacuum lines - these two can cause grief with varying
    idle.
     
    Philip Nasadowski, Nov 13, 2004
    #3
  4. Ben

    Brock Bolton Guest

    Well, dunno if this will help, but I had a similar problem in my 98 SC1 a
    few weeks ago. The car would rev high at idle for no reason. Turns out it
    was a faulty engine temp. coolant sensor (ECTS), which is an easy repair...I
    did it myself for the cost of $20 part. Check out www.saturnfans.com and do
    a search for ECTS replacement. The old ECTSs are resin tipped and crack
    with time. If you haven't had yours replaced, this may be it. The new ones
    are brass tipped.

    Hope this may help!
     
    Brock Bolton, Feb 13, 2005
    #4
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