Question about 1999 Jeep Wrangler

1 Answer

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

Some times my jeeps rpms will rev up higher then normal for no reason when driving or just sitting there idle its a jeep wrangler sport 4.0 manual

Posted by evan21620 on

  • Raymond Ramirez
    Raymond Ramirez May 11, 2010

    TPS (Throttle Position Sensor) or anti knock sensor. you can try using carbuerator cleaner in the air intake this might free it up. If you use cleaner make sure you spray around the edges of the inside wall. Let me know if this helps



1 Answer


  • Level 1:

    An expert who has achieved level 1.

  • Contributor
  • 1 Answer

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

  • davidthx138 Aug 12, 2009

    UPDATE: They now say it is the Throttle Position Sensor, $ 99 for the part alone, Hopefully this will fix the problem, I will let you know.

  • davidthx138 Apr 26, 2014

    UPDATE: Dealer never was able to fix the problem so I got rid of this vehicle. This has been the abxolute worst car I have ever owned. I had so many mechanical breakdowns I am amazed theat people still buy these Jeeps. I bought this Jeep new and had transmission, rear end and clutch problems from the get go. In addition there were the vacuum leaks, holes in the exhaust manifold, water leaks, most while under warranty.



Add Your Answer


Uploading: 0%


Complete. Click "Add" to insert your video. Add



Related Questions:

1 Answer

Reasons for high idle on 4.2l 90 jeep wrangler with 2 barrel weber carb

check all your vacuum hoses and connections. one is not seated properly or connected

Jun 25, 2014 | Jeep Wrangler Cars & Trucks

1 Answer

Rev up and down

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

Jan 18, 2014 | 1999 Jeep Wrangler

1 Answer

Rough idle, gas fumes, sputters while driving

You have an air leak around the throttle body

Sep 21, 2017 | 1988 Jeep Wrangler

1 Answer

Jeep wrangler 2.5 sounds like diesel

You might need to change the timing chain and guides.

Aug 24, 2012 | 1997 Jeep Tj

2 Answers

I have a 2002 Jeep I have a 2002 Jeep Grand Cherokee Laredo v-4. When I am idling at a light, my jeep has shut off about seven times. It starts right back up though. When I am idling and sometimes while...

I have replaced TPS - throttle position sensors on jeeps for this same problem ! Fixed them right up . But use jeep parts , not aftermarket ! Jeep's don't like aftermarket parts .

Jun 02, 2017 | 2002 Jeep Grand Cherokee

1 Answer

My 91 wrangler will idle just fine and drive fine for the most part but it seems to be after about 15 min. of driving it will cut out on me and then it will pick back up sometimes...sometimes i have to...

Replace the coil pickup located in the distributor under the rotor-they are common problems, lots of people who off-road with jeeps carry an extra because they do this.

Apr 01, 2011 | 1998 Jeep Wrangler

1 Answer

2004 jeep grand cherokee idling problem. Revs motor 200 to 500 rpms higher while driving.

I had the exact same problem on my 04 GC. I put some Techron Concentrate Plus Fuel System Cleaner in from Wal-Mart and it seemed to fix the problems right away. Let me know.

May 31, 2009 | 2004 Jeep Grand Cherokee

2 Answers

2004 jeep wrangler 2.4 litre 4 cylinder

check the ground wirea at the dipstick tube,remove them all,and bend the ends of the wire,look for weak or broken wires, i bought several 4 cyl jeep that had problems at shift, fall on their face < after the engine settled back in to place,so wires made contact> just a thot. the ground wires are small the engine moves,when shifting.

Jul 29, 2008 | 2004 Jeep Wrangler

Not finding what you are looking for?
1999 Jeep Wrangler Logo

1,125 people viewed this question

Ask a Question

Usually answered in minutes!

Top Jeep Experts


Level 3 Expert

85239 Answers


Level 3 Expert

4372 Answers

Thomas Perkins
Thomas Perkins

Level 3 Expert

14852 Answers

Are you a Jeep Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides