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Thread: xj revs high then shuts off

  1. #1
    Recovery Whore RescueJP's Avatar
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    Default xj revs high then shuts off

    My friend has a 99xj manual. It will run fine for 30min. Then it will rev to about 3000 rpms and just die. Any ideas.
    1981 CJ7- 4in lift on 33's, Twin sticked dana300, aussied D30, Custom bumpers,Herced inside. Riddler covers.

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    Throttle position sensor would be my first test/replacement part.

    Later, T.J.

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    Geländewagen Bigskyxj's Avatar
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    Sounds like the high rev is caused by a fuel pressure drop. An extremely lean condition will usually give a symptom like you described. Give us a few more details like:

    Can it restart right away?

    What is the engine temp when it dies?

    What is the oil pressure like when it dies?

    Try to push the shrader valve in on the fuel rail right after it dies and see if any fuel squirts out.


    Throw a fuel pressure gauge on it and watch fuel pressure until it dies. Should be 31PSI or better. (Auto rents tools out if you don't want to buy one).


    Report back.
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    A large vacuum leak will cause the lean condition as well, check main vacuum lines.

    If TPS is bad or suspected, unplug it and try to start.

    9 out of 10 times it is a vacuum leak. Check intake bolt are tight, line to brake booster and so on

  5. #5
    Senior Member HillBillE's Avatar
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    Could be the fuel pump's on it's last legs. (fuel pressure drop)

    Other than that, all I know is the other stuff mentioned, TPS and vacuum leak.


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    Vacuum leak somewhere is my guess too.
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    Senior Member HillBillE's Avatar
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    Any thing to report yet? Curious as to what's cuasing it.


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  8. #8
    No Mas Jeepalonie
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    I vote vacume leak also
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    Quote Originally Posted by rescueyj View Post
    My friend has a 99xj manual. It will run fine for 30min. Then it will rev to about 3000 rpms and just die. Any ideas.
    if it runs fine for 30 mins and then goes crazy, its not vacuum, vacuum would be instant. where is fuel pressure regulator, if in tank with pump could get hot and break down, think that would flood it though. I would need to see this in action with fuel gauge on it. will it start back up, if so how does it run.

  10. #10
    Recovery Whore RescueJP's Avatar
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    will not be able to look at it until thur due to hectic work scheduale. FML
    1981 CJ7- 4in lift on 33's, Twin sticked dana300, aussied D30, Custom bumpers,Herced inside. Riddler covers.

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