1999 Jeep Wrangler starting problem - JeepForum.com
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Unread 07-24-2013, 07:26 AM   #1
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1999 TJ Wrangler 
Join Date: May 2012
Location: , CT
Posts: 5
1999 Jeep Wrangler starting problem

Last week during the extremely hot weather I drove my Jeep on the interstate for approximately 40 miles with the air conditioning on high, when I reached my destination I left it running at my friends driveway approx. 5 minutes later when I came back out the Jeep was stalled (over 1/2 tank of gas) and would not start (battery had plenty of cranking power). I had to have it towed to a Jeep dealer, the next day they started it right up and ran it but could not duplicate the problem, nor were there any codes showing a fault. Now I am perplexed as to what caused this problem, vehicle is well maintained, has new exhaust system, sensors all check out, ignition switch was replaced (all work done by Jeep dealer) mileage 55,564, original miles. Any help would be greatly appreciated.

Any help

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Unread 07-27-2013, 08:49 AM   #2
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Join Date: Jul 2013
Posts: 94
I dont remember much of that yr jeep but seems to me that was the 4.0 with fuel rail system? If so the only thing i can think of atm was the safty valve on the fuel rail i believe at the front. It has a little diaphram with a vacume line going to it. It relys on engine vacume to prove engine running to open valve for fuel flow. Maybe a vapor lock and or positive presure closed the valve and prevented fuel? Next time it happens. Check for fuel rail pressure and then for spark. Since you cant recreate now it will be hard to diagnose. I could be way off but def where i would start.
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Unread 09-06-2013, 07:14 AM   #3
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1989 YJ Wrangler 
Join Date: Jun 2013
Location: Central Mississippi, Mississippi
Posts: 1,359
I would check the Crankcase Position Sensor (CPS). They can work fine when cool, but if faulty a heat soaking will shut them down, causing a no start situation. After they sit awhile and cool down, then the jeep will start. They are not that expensive to replace. This happened to my YJ as well as my wifes Mercedes. Check it out.
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