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  • 4.0 cutting out

    gotta a 93 YJ. Cutting out when it gets warmed up, bad. Eventually dies and wont start. cleaned out throttle body, replaced cap rotor and coil, thinkin maybe crankshaft sensor on bellhousing? Its not throwing any codes, so wont be able to read any I wouldnt think. anybody got any clue whats up? when I cleaned the throttle body, it seemed to have cleared it up, but when we took it for a drive, it was doing the same thing. So when it gets a load on it is when it does it, but when just sitting reving it up it wont do it. Any clues?

  • #2
    don't forget to look into an ignition module potentially cutting out when it gets warm..... or even maybe the coil, since they are mounted right on the side of the block....



    it could be the CPS as well.. I have had those go out a few times in the past.

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    • #3
      Cat??

      PS. Welcome to the forum

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      • #4
        hi Jamey!

        Not checked the cat yet.

        CPS, Im assuming the C_____ Positioning Sensor? Or did you mean TPS(throttle positioning sensor) It doesnt act like that though.

        and wheres the ignition mudule? I know the coil is there, but I replaced it.


        BTW, im anything but a "Mall Crawler"!!! I just noticed it on my signiture.

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        • #5
          CPS Crank Position Sensor

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          • #6
            Is that you Mikey????

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            • #7
              Yep, its me!!

              And ya, Im leaning towards the CPS, didnt think about the initials for it!! hehe

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              • #8
                well, tried the CPS, coil, dist, rotor.....now whats next?????Still runs fine at idle and a little above idle, runs fine without a load on it, but put it in drive after its warmed up(with a load) and it cuts out bad at midrange to upper end. Anybody???? Im stumped!!

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                • #9
                  Fuel pump? just wondering because if it might not be keeping up with the increased demand, if you know what i mean. I am not very knowledgable, like you know, just trying to help.

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                  • #10
                    Could be the cat. Also, how about the fuel filter? Or, could one of your fuel lines be too close to your exhaust? Another thing, think I can remember something in JP Magazine about this problem. That was something weird, like a short or bad ground with the fuel pump/sending unit, or something like that. Can't remember for sure. Maybe check JP's website? Hope something here helps.

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