Question about 1998 Jeep Wrangler
Vacuum leak, get a can of carb cleaner and give it a quick spray into throttle body you will notice a change in the rpms. then spray it around the outside of the throttle body and on the vacuum hoses, if the RPMs drop again that is where the leak is.
Posted on Dec 09, 2014
A quick fix is to look under the hood, look for where the intake meets the throttle body, you will see a bolt which can be adjusted. When you start to screw it out, your idle will decrease...
Posted on Apr 25, 2010
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Posted on Jan 02, 2017
SOURCE: 1999 jeep wrangler heater blower
you need to change the resister block for the fan. it is located on the heater duct near the fan... there is a connector on it and two or three screws holding it in.
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Posted on Feb 21, 2009
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
1. check for vaccuum leaks.
2. check for a check engine code
3. check the throttle body/butterfly plate for carbon build up.
Posted on Sep 09, 2009
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