After going back and reading my first post to the last post and all the replies in-between I found that I had omitted one piece of information. I am currently running this Jeep with a remanufactured computer that I bought from Auto Computer Exchange. In my original post I spoke about the shop saying that the computer was fried and that I needed a new one and that they then ordered the incorrect computer. Well, after speaking directly to the mechanic he assured me that this was the problem, so that is when I ordered a ECM(PCM) from the above company. Installing this "new" computer made no difference in the 30-minutes to stall problem I was having and continue to have. Below is a complete list of the troubleshooting I have done to date. If anyone can divine, from this list what the issue is I will be eternally grateful. If not it will be going to the dealership sometime Monday. Thanks
1. Crank Position Sensor replaced. The CPS has tested good
2. Cam Position Sensor replaced. Put the old one back with no change in problem
3. ECM(PCM) Replaced problem still happens Old or New
4. Removed and cleaned Throttle Body
5. Tested the TBS O.K.
6. Tested all 4 of the O2 sensors O.K.
7. Tested Coolant sensor O.K.
8. Tested MAT Sensor O.K.
9. Tested the Coil Rail at room temp O.K.
10. Tested and swapped the ASD Relay O.K.
11. Tested and Swapped Fuel Pump Relay O.K.
12. Cleaned went through every connection both electrical and vacuum found nothing obviously wrong
13. Tested fuel pressure looks a little weird but I think it is O.K. See results; 0 PSI cold engine key not turned
46PSI cold engine key turned to on position
46-48PSI engine started still cold at idle warming-up
44-50PSI bouncing up and down engine at operating temperature.
48PSI when motor dies.
The last test I have to do is from a post on another site and involves the coil. This will be the last test and is either a pass/fail. Here is the test; Unplug wire connector from coil rail and check to see if you are getting 250-1000 ohms after it dies through the harness.
I'll also be pulling the coil rail to see if the resistance has changed.
Thank you for your help
Sunday, November 16th, 2008 AT 8:49 AM