Engine Performance problem
2000 Jeep Cherokee 6 cyl Four Wheel Drive Automatic 142000 miles
O.K. Here is the deal I have a 2000 Jeep Cherokee Sport 4x4 automatic that stalls after about 30minutes +/-. This goes back to earlier this year when it became hard to start. Come to findout it was the crankshaft sensor. Replaced and all was good. Then it started to act up again. 3months later. This time I had to have it towed, but I was near a parts shop so I borrowed their OBDII tester and it came up with crank or camshaft sensor. So, I bought the camshaft sensor this time replaced in the field. It started and died after giong around the parking lot one time. Called tow truck. At the shop they said the crank sensor went. They replaced it, I drove it one day and it died again. Back to the shop. This time they said the computer was dead. Jeep ended up back at my house after I got pi**ed-off at the shop for ordering the incorrect computer and letting two weeks go by without keeping me clued in on what happened. So, I have a car that dies after it warms up. It gets to just about 210 degrees and will shut-down. I have replaced all the above parts, switched the ASD relay with the cooling fan relay to no avail. I have checked all the connections and vaccuum lines. Nothing seems to be out of wack. I removed throttle body, disassembled and throughly cleaned. Looked for any broken connections or anything obvious. It was very dirty. Re-installed started it back up and it seemed to run normally, but then stalled. Also, removed the coil rail and tested it with an OHM meter and it checked out. I ran the OHM meter over every switch and sensor I could find and have pulled and checked every fuse. Everything is in spec.I got a fuel pressure gauge hooked up. According to the FSM it is supposed to read 49.2 psi +/- 2 psi, the reading on this thing is bouncing between 44psi and 50psi! Is that normal? Here is the fuel pressure information: 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 tempreture, 48PSI when motor dies.
Total time start to finish 31minutes 47seconds. You could almost set your watch by it! Possible regulator problem?
Anyone reading this, first off Thanks, secondly let me know what you think the problem is.
have the same problem?
Saturday, November 15th, 2008 AT 1:57 PM