Question about 1999 Jeep Cherokee

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99 cherokee idle issue

I have a 99 cherokee with 4.0. starts up everytime you hit the switch but after a couple of minutes the idle starts climbing and i final cut it off. RMPs climb to about 5000 before I cut it off.I have ran check on system using OBDII no codes. any Ideas??

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  • dodgethisv6 Aug 26, 2008

    I replaced TPS and it dont continue to idle up but still idling around 1700 RPMs. Any other ideas? Have heard mention of either vaccum leak(which I have checked every line) or idle air sensor. Thankyou.

  • dodgethisv6 Aug 27, 2008

    I tested the TPS and was getting very erratic reading that is the reason for replacement. With the new one one the reading are staying around 1.1 volts. I have checked every vaccum line that I can find. Pulling each one loose to see if the idle changes and placing my finger over the port to see if it idles down but all to no avail. Thankyou in advance.

  • dodgethisv6 Aug 31, 2008

    I found a very small crack in the throttle body gasket. I replaced it this morning... Now it still has similar problem with added twist. It idles erratically like someone is sitting inside there tapping the gas pedal. is there any way to check the air bypass and exactly where is it located;is it the idle air control senot located need to the TPS? Thankyou.

  • dodgethisv6 Aug 31, 2008

    I rated a thankyou for trying. But still havent found a solution. I continually check everything you have suggested. Never mind I am not here to debate about this.

  • dodgethisv6 Sep 06, 2008

    emissionwiz, I would like to say thankyou. I sometimes get a bit hotheaded but after sitting down and spending some time I finally found a vaccum leak on the bottom of the intake at rear of the engine. again Thankyou.

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  • Jeep Master
  • 60,867 Answers

First thing to check is the Throttle Position Sensor (TPS), it should read around 1.0 Volt at idle.

Posted on Aug 21, 2008

  • 2 more comments 
  • yadayada
    yadayada Aug 26, 2008

    I didn't say replace the part, I said test it, never just throw parts at a problem unless you're rich of course, but then you would'nt work on your own ride anyway. You didn't test, so I will offer no further advise, I don't want you wasting anymore money because of my advice no be followed and you going down the wrong road to repair the issue, I will ask if you have checked for vacuum leaks on the engine, don't think you can in trouble there.

  • yadayada
    yadayada Aug 27, 2008

    Spray carb spray all around the intake area and listen for a change in rpm, you may have an intake manifold leak, and the air bypass could be stuck open.

  • yadayada
    yadayada Aug 31, 2008

    Why would I help you further? you rated me with a big zero, the info I gave you is correct, you just have to think a little or maybe spend YOUR money for a service manual.

  • yadayada
    yadayada Aug 31, 2008

    Me either, good luck.

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