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Thread: Isuzu Rodeo fast idle

  1. #1
    GeeBee
    Guest GeeBee's Avatar

    Default Isuzu Rodeo fast idle

    We have a 1997 Rodeo with the 4.2L V6. It idles too fast. Things we have
    done include replacing the "idle motor", which is actually a solenoid.
    That only cured it for a short time. I have tried lubricating throttle
    linkage and throttle body, to no avail. Strangely, when the battery was
    disconnected for an unrelated problem, everything was fine for a few
    hundred miles, then the idle speed started to creep up again, to the
    point it idles at about 2200 rpm. This is not a good thing considering
    we take it up mountain roads occasionally. Even changing down a gear,
    the machine wants to run away on long down grades, leading to me having
    to ride the brakes way too much.

  2. #2
    Steve W.
    Guest Steve W.'s Avatar

    Default Isuzu Rodeo fast idle

    GeeBee wrote:
    > We have a 1997 Rodeo with the 4.2L V6. It idles too fast. Things we have
    > done include replacing the "idle motor", which is actually a solenoid.
    > That only cured it for a short time. I have tried lubricating throttle
    > linkage and throttle body, to no avail. Strangely, when the battery was
    > disconnected for an unrelated problem, everything was fine for a few
    > hundred miles, then the idle speed started to creep up again, to the
    > point it idles at about 2200 rpm. This is not a good thing considering
    > we take it up mountain roads occasionally. Even changing down a gear,
    > the machine wants to run away on long down grades, leading to me having
    > to ride the brakes way too much.


    Sounds like you have a vacuum leak somewhere. Air AFTER the MAF will
    cause a high idle.

    --
    Steve W.

  3. #3
    Rodan
    Guest Rodan's Avatar

    Default Isuzu Rodeo fast idle

    GeeBee wrote: (1997 Rodeo 4.2L V6)

    It idles too fast. We replaced the IAC and that cured
    it for a short time. Lubricating the throttle body parts
    does not help. When the battery was disconnected
    for an unrelated problem, everything was fine for a few
    hundred miles, then the idle speed started to creep up
    again, to about 2200 rpm. Even changing down a gear,
    the machine wants to run away on long downgrades,
    leading to me having to ride the brakes way too much.
    __________________________________________________ __________

    "Steve W." wrote:

    Sounds like you have a vacuum leak somewhere. Air
    AFTER the MAF will cause a high idle.
    __________________________________________________ _________

    Yes, the first thing to suspect is a vacuum leak. Check
    the vacuum lines for cracks and tighten throttle body
    mounting screws. NOTE: The car previously had the
    same problem and a new IAC fixed it. It is possible
    that the new IAC is failing.

    Good luck.

    Rodan.

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