Would like some help i have a grand cherokee 4.7 v8 and it stalls when it reaches running temp and wont re-start till cooled down i have changed the crank positioning sensor and ecu but still same problem. two weeks before the problem the rad had a leak.
any help would be good as i need the car back on the road.
Had a similar issue 2 nights ago, then it gave up altogether yesterday. After a couple of hours it started again but didn't last long. I was getting a spark and finally managed to dig out the fuel rail test point under all the LPG gear. There was no fuel when I pushed in the pip on the valve. Also I had no current flowing through the fuel pump fuse.
Turned out to be the wire running to the fuel pump (at the tank) which had corroded near the plug just in front of the fuel tank. I made a temporary repair but it was difficult to solder the corroded wires. Fortunately it was on the part that goes though into the cabin under the back seat so I was able to get some slack to work on it. I will get a new plug and remake that bit of harness then splice it in under the seat. I will cover it in a plastic bag or something as it very exposed to the salt.
If any one knows what those 6 way plugs with the red locking tab, similar to the ones on the rear lights are called? or a UK supplier?
I had this problem in a different car a few years ago. It ended up being that the cat needed replaced. Same problem, car would start cold but when the cats warmed up all the way it would stall. Couldn't restart until the cats cooled. Temp solution - drill the cats (that's not entirely legal but works).
get, borrow, rent a fuel pressure gauge - i had a similar issue, though with mine it would start cold fine and ran fine until I shut it down - then it would not start again until the engine was cold again (crank strong but still wouldn't start)
once I checked leakdown and determined there was zero fuel psi right after shutting it down, and only 30psi while running, I figured out my fuel filter/regulator (mopar) had crapped out .... changed the fuel filter and problem solved - correct psi while running, and holds steady long after turning it off