'99 SL2 idle bounce, stall, and stick

Discussion in 'Saturn S-series' started by Wound Up, May 29, 2006.

  1. Wound Up

    Wound Up Guest

    Hello group,

    I have a '99 SL2 5-spd. The following two issues have persisted for
    some time now. I have become increasingly concerned by it, thinking it
    was just mildly annoying at first. Some times it sticks at 2k+ out of
    gear, and a restart is the only way to "cure" it, or it will just decide
    it's done revving, and will resume normal operation. Other times, it
    bounces to near zero with the a/c on, and will sometimes stall. There
    does seem to be a weak link with temperature, with the high idle
    problem. I understand the load on the little 4 with the a/c compressor
    may cause some idle fluctuation when the clutch is suddenly disengaged,
    but it's definitely abnormal in that regard.

    Years and years of EFI Fords have idle air control valves that gunk and
    cause problems, so that was my first thought. However, I don't know GM
    products of any era well at all. Is that likely the issue here?

    Thanks all
    Wound Up, May 29, 2006
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  2. Wound Up

    Lane Guest

    Idle air control solenoid/valve would be my first guess, but a person
    shouldn't replace parts based on a guess. Stop by Autozone and get the
    stored codes read for no charge. Then go from there.

    Lane [ lane (at) evilplastic.com ]
    Lane, May 29, 2006
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  3. Wound Up

    Wound Up Guest

    I didn't know Autozone did that. Shows what I normally work on, things
    tuned by hand. Thanks for your input!

    Wound Up
    ThunderSnake #65

    AHPBBFM Pages: http://tinyurl.com/9yulk
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    Wound Up, May 31, 2006

  4. IMHO:

    When every I have a problem with rpms high or low, I go right for
    cleaning the throttle body.

    If I have a low rpm, to an eventual stall, I go for the Coolant
    Temperature Sensor.

    After this two, if I still have problems I panic. ;)


    tom @ www.NoCostAds.com
    Tom The Great, May 31, 2006
  5. Wound Up

    wavy Guest

    Wound Up-
    You know - I would think the problem would have changed in 5 or 6 years
    (ie. the engine would have changed to make the same problem/symptom
    But I've had the exact same problem with high idle.
    The problem? Because of a bad coolant temp. sensor, the engine thought
    the coolant was 10 below zero.
    This same sensor problem occured on both my 94 and my 95 SC2 (on the
    latter, it was the previous owners problem that translated into a good
    deal because I knew exactly what their shade tree mechanic didnt!)
    In my own case, it would idle 2000 to 2500 while the vehicle was
    moving, but would drop down to 1200 or 1500 when the vehicle came to a
    complete stop.
    If you can, try to check the resistance of the sensor. At 80 degrees
    f, it should read less than 100 ohms (I think - I dont have the manual
    handy) but it Definately should not read higher than 1000.
    -hope to help
    wavy, Jun 4, 2006
  6. Wound Up

    Wound Up Guest

    I can, I have an ohmmeter.

    At 80 degrees
    Many thanks! And to the others as well. I'll ceheck a few things out,
    cleaning stuff is always good, and check that resistance reading....

    Wound Up
    ThunderSnake #65

    AHPBBFM Pages: http://tinyurl.com/9yulk
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    Wound Up, Jun 8, 2006
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