I have a 89 cherokee Laredo 4.0L . My jeep stalls 99% of the time when it gets around 210f by the guage. 1% when cold . It does not matter if its at idle, speeding up or slowing down . I had a dealer check it. They claim it lost fuel pressure and was low to begin with .I replaced the pump & strainer per dealer and no change at all . I have replaced the MAP , ICM ,cap & rotor, plugs , Crank sensor , and a broken pre-heater hose. Still stalls . About a year earlier I replace the serpentine belt but I was running fine before and after that . I drove it in a couple miles on a broke belt but it did not have time to get hot before it got home. It seems to be related to the engine temp more than anything . If it cuts off I can crank the engine and after a few tries it starts and will run till it gets about the same temp again. It may take a 2-15 mins but it wil restart . Its got the old AMC computer in it and to be honest I dont think any of the several mechanics or the dealer may be reading any codes . I cleaned the Idle control and no change .What could cause these symptoms at Idle, while speeding up ,and slowing down ? From my own work around transformers I am starting to think maybe a sensor or the coil. I have seen coils (non-auto) that would work get till they ran awile then stop working for a few seconds to a minute or a hour then work again . This might account for when I tested it a few time it was getting spark to the plugs right after the stall . Up till this started the jeep ran great .Thanks for any help you can give .
May 10, 2012 at 2:29 PM