Question about 1999 Jeep Wrangler

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Rev up and down

Have a 99 Jeep wrangler 4.0L Sport. Lately (about a week) the engine has been revving up and down and when driving it seems to have trouble getting into gear and isn't accelerating smoothly

Posted by Julia Belle on

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  • Jeep Master
  • 20,706 Answers

Isc filthy and sticking open
or TPS bad.
the 2 top fails for out of control idle on 4 liter.
or vacuum leaks

Posted on Jan 19, 2014

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5 Related Answers

shaggyrat

Christophe Thompson

  • 1224 Answers

SOURCE: 99 jeep wrangler

get a 6 cylinder motor drop in this is best gas saver for most vehicles 4 cylinders dont have the ability to push all the weight of a vehicle but runs smoothly
6 cylinders are as i put in words are evenly balanced for everyday use and not gas guzzler either

Posted on May 16, 2008

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csmock132

Clint Smock

  • 4669 Answers

SOURCE: 2004 Jeep Wrangler - Clunking Noise when shifting out of Park

It could be lash in the differential which is normal, but it could also be a loose u-joint in the driveshaft. Check the rear driveshaft u-joints.

Posted on Mar 12, 2009

davidthx138

  • 1 Answer

SOURCE: will idle high sometimes up to 3000 rpms when driving or sitting still

I have the same Jeep and same problem. The engine was running rough. The Jeep dealer fixed a vacum problem in the manifold and they then decarbonized and cleaned the fuel injectors. After these repairs the idle problem began, it would spike to 2000 rpm while sitting at idle, sometimes it would slowly come down, sometimes I would have to tap the accelerator. I took it back in and they then replaced the throttle motor and reprogrammed the PCM (Power Control Module?) Still same problem. Now they suspect a another vacuum leak and I am taking it back in on Tuesday, will let you know what happens, $ 1,300 so far.

Posted on Aug 08, 2009

paul campbell

  • 1071 Answers

SOURCE: Jeep 1997 Wrangler. Gear shifting very hard

synchronizers are going bad a used trans would be cheaper than a rebuild due to the labor involved

Posted on Aug 19, 2009

rickb63

  • 170 Answers

SOURCE: Jeep wrangler 2.5. Motor idles up and down,

replace throttle position sensor

Posted on Jan 16, 2010

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You have the 4.0L straight six engine, yes?

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Will idle high sometimes up to 3000 rpms when driving or sitting still


I have the same Jeep and same problem. The engine was running rough. The Jeep dealer fixed a vacum problem in the manifold and they then decarbonized and cleaned the fuel injectors. After these repairs the idle problem began, it would spike to 2000 rpm while sitting at idle, sometimes it would slowly come down, sometimes I would have to tap the accelerator. I took it back in and they then replaced the throttle motor and reprogrammed the PCM (Power Control Module?) Still same problem. Now they suspect a another vacuum leak and I am taking it back in on Tuesday, will let you know what happens, $ 1,300 so far.

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