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..