Question about 1999 Jeep Wrangler
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
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
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
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
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
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