2000 Jeep Wrangler Sports hesitates and dies after warm. - Jeep Wrangler Forum

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Old 02-13-2011, 08:20 AM   #1
Join Date: Nov 2008
Posts: 1
2000 Jeep Wrangler Sports hesitates and dies after warm.

I'm not extremely mechanical so please excuse any errors in my post. I have a 2000 jeep Wrangler Sport 4.0 with about 130000 miles. About 4 months ago while driving, the jeep would hesitate, stumble and stall. This usually occurred about 15-20 minutes after it was warm. It typically restarts but then stalls immediately. If you let it sit for about 30-60 minutes it will restart fine and then the whole process restarts after its warms. Early on the check engine light did not come on, but a few days later it showed itself.

Initially, I did not scan the check engine light, but decided to buy all new plugs and replace myself. The plug next to the fire wall was fouled, but the others were clean. FYI The jeep had a tune up 18 months prior with all new plugs. After replacing the plugs the jeep ran fine for about 2 weeks, but then the entire issue started again. I scanned and code 1391 was noted.

I brought the jeep to a co-workers husband who has a private shop and has worked on my cars in the past. Here is were the headache begins and continues. He initially replaced the CAM Sensor. Jeep ran for one hour and quit. He then replaced the ignition coil pack and crank sensor. Also checking CAM sensory shaft for play. The jeep ran fine for about 4 hours then started missing and throwing codes. The next set of codes PO 352 D Ignition Coil B primary Circuit Malfunction. He again, checked all connections and did the "wire" wiggle test and all was good. He then cleared all the codes and rechecked. Jeep then set code suggesting Ignition coil A B C Malfunction.

Well, he suggest that it had to be the computer module. So I sent the computer module off to have a diagnostic check. The company returned the computer module stating it was in perfect working condition. He was still convinced that it was the computer module, so I bought a computer off the internet and had it flashed to meet my jeeps ID numbers. Well, it ran fine for about 1-1/2 hours and died again...... Scanned the computer and no codes were set??? If you let it sit for about 30-60 minutes it fires right up and then dies. PLEASE if any one has any info....HELP

I checked this forum and other sites on the web and it appears that much of what he has done was recommended... Replace CAM sensor, Replace ignition coil pack and crank sensor..


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Old 02-13-2011, 01:39 PM   #2
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Join Date: Jan 2010
Posts: 28
Check the fuel pressure. Or you may just want to try replacing the fuel pump relay if you don't have a fuel pressure gage, but it could be the pump. Relays aren't that expensive and easy to replace (and never hurts to have a spare).

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Old 07-11-2011, 11:51 PM   #3
Join Date: Jul 2011
Posts: 1
pain in the ...

dear three labs ive got a simaliar issue my jeep used to die but now i just start it and if it wont rev past 1500 rpms i know ive failed yet again ive replaced cam ,crank an both o2 sensors fuel pump and filter and plugs and ecm (computer) and ive been stumped til lastnight i read a forum the guy said its not widely known that u have to check the hole that the sensor reads through to start u have to have ur #1 cylinder at top dead center or (tdc) then u should be able to slide an allen wrench through the hole i havent had time to check this out i travel but if u want to read it for ur self google "how to check timming on 2000 jeep" thats what i thought was my issue but that jeep forum pretty much told me i was way off hope this helps u if so let me know ill b trying it tomorrow rick
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Old 04-11-2012, 01:29 AM   #4
Join Date: Apr 2012
Posts: 11
I too had a similar problem and found a solution. 1995 jeep wrangler would start and run perfectly until it reached operating temp(210). Once warm the jeep would hesitate and backfire. I replaced fuel filter, plugs, wires, distibutor cap, rotor, and even the coil to no avail. I tested the coolant temp sensor, MAT, MAP, Crankcase position sensor and the cam sensor, everything appeared in specs. I poured a plethora of gas treatments, cleaned throttle body with carb cleaner and checked for vacumm leaks with a propane source. Tired cold and depressed I called the dealership and arranged for a diagnostic check that I could not afford. Still I felt that I had not checked enough. I pulled out an oooolllld ossilioscope and rechecked the CRank sensor..I found a very minor aberrations and decided to replace it. $65 at autozone. It worked. Several weekends shot but I'm a happy camper. I felt it important to share this as I got so much info from the site but no one posts the solution.
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Old 04-11-2012, 10:25 AM   #5
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Join Date: Feb 2012
Location: Newport News, VA
Posts: 82
I'm just going out on a limb but could it be that either your alternator or battery could be at fault? I know I had the problem in my old Bronco where when it warmed up it wouldn't start back up due to to much resistance when warm but it never died. I guess it would just be another place to check out.
2004 Jeep Wrangler Sport which happens to be stock for now...
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