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Thread: Engine or trans? That is the question....

  1. #1
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    Default Engine or trans? That is the question....

    I have a 91 XJ 4.0 AW4 181K and going but, I have a situation that's driving me insane. So...it runs amazing after the assembly but when I drive and coming to a stop like a red light, it starts to bog down to like 250rpms...almost cuts off. Hell, it actually cut off a couple times this week. When I do stop and it stays running, I can feel it jump and the rpms start to rise like the transmission downshifted to take off again....what do you think it is?

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  2. #2
    Join Date
    Sep 2009
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    Chico, CA
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    Default Re: Engine or trans? That is the question....

    The first thing I would look at is the idle air controller on the throttle body. They can get dirty and sticky inside. Easy and cheap to clean
    230 hp 4.3L Chevy
    Built 4L60E with manual lockout
    Atlas 4 speed
    Griffin radiator
    On board air
    Warn 9.5ti on custom bumper
    7.5" RE front and bastard pack rear on custom long arms
    30 gal gas tank
    lockers
    And a bunch of other stuff

  3. #3
    cantab27's Avatar
    cantab27 is offline Level: Uber Jeep Cherokee Trailer Queen
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    Default Re: Engine or trans? That is the question....

    yep TPS......................
    keeping it red........

    I DRIVE A BARBIE JEEP

    Quote Originally Posted by XJ4IV
    .... lol Im a jerk tonight!
    Originally Posted by bigjim350 View Post
    Think I would go that crazy too if my Jeep turned white

    http://www.youtube.com/watch?v=XGg0C...eature=related


  4. #4
    Pinkyman's Avatar
    Pinkyman is offline Level: Uber Jeep Cherokee Trailer Queen
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    Default Re: Engine or trans? That is the question....

    I am having a similar issue since i "cleaned" my IAC, it doesnt want to start, and once i get it started, i can keep it running if im on the gas, but it dies as soon as i let off. I cleaned it again, and it would idle fine, and almost die when i let off.

    Ive been reading about it all day, since it worked before i cleaned it, and it sounds like you can clean it and reset the computer by disconnecting the battery. Then it can re-learn where it is supposed to be.

  5. #5
    denverd1's Avatar
    denverd1 is offline Level: Uber Jeep Cherokee Trailer Queen
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    Default Re: Engine or trans? That is the question....

    its an engine problem. good suggestions above
    Wheelin' East Texas in a RED XJ

    RED 98 XJ with 4.5" lift, ZJ steering, front and rear locked on 33's
    cowl intake, Cobra CB, SYE, bumpers, 10K winch, lights
    ,___________
    //___l__,\____\,00_
    l_--- \___l---[]lllllll[]|
    (o)_)--(o)_)--(o)_)

  6. #6
    Join Date
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    Default Re: Engine or trans? That is the question....

    Ok

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