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Thread: 2001 XJ running rough

  1. #1
    prerunner1982's Avatar
    prerunner1982 is offline Level: Uber Jeep Cherokee Trailer Queen
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    Default 2001 XJ running rough

    Posting for a good buddy... really I am.
    He got his son a 2001 XJ for his first vehicle. Ran great until he washed the engine and it started running rough. Starts up fine, shakes at idle and slow speed, 45mph and up is runs better.
    Been a long time since then and it still doesn't run right so it's not just components getting wet.
    He has replaced coils packs, plugs, wire, injectors, and sensors. Says he has cleaned every connector as well. He says he can disconnect the injector wires on the first 3 cylinders one at a time and no change in the way it runs, if he pulls any of the rear 3 cylinder injector plugs the engine runs worse so he thinks it's something in the front 3 cylinders. Says when running you can smell raw fuel and in the shop it's bad enough to burn your eyes.

    The XJ does have 220K miles.

    Ideas?

    He is thinking something in the valvetrain is stuck/broke or head gasket.
    I advised him on the 0331 head issue but would like to gather more suggestions before he goes through that.
    1993 2 door 4x4 4.0 5 speed
    1997 4 door 4x2 4.0 auto RIP 6/6/2016
    2000 4 door 4x2 4.0 auto


    Day of Dirt Adventure

  2. #2
    Join Date
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    Chico, CA
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    Default Re: 2001 XJ running rough

    Jon, has he a CEL. Just the slightest miss will generate a code
    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
    prerunner1982's Avatar
    prerunner1982 is offline Level: Uber Jeep Cherokee Trailer Queen
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    Default Re: 2001 XJ running rough

    He says no codes.
    1993 2 door 4x4 4.0 5 speed
    1997 4 door 4x2 4.0 auto RIP 6/6/2016
    2000 4 door 4x2 4.0 auto


    Day of Dirt Adventure

  4. #4
    Join Date
    Sep 2009
    Location
    Chico, CA
    Posts
    29,847

    Default Re: 2001 XJ running rough

    I think it is the O2 sensor on the bank not running right. Those have a sensor for the front and back. And yes, a little moisture can mess them up
    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

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