93 Cherokee run 15 min then dies

Let it warm up and then remove the distributor cap and let it dry out. God Bless America, Bill O|||||||O mailto: snipped-for-privacy@aol.com

Does it throw any codes? One fairly common warm up related problem is the crank position sensor located in the bellhousing. Blink the codes out with the key trick or plug a scan tool in.

The crank position sensor located on the bell housing top drivers side is known to get a bad connection on it's plug which causes your symptoms. Follow it's wire to the plug in. A good clean with a spray contact cleaner will fix it if that is it.

Mike

86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail > My dad has a 93 Cherokee Sport 4.0 L, 135K in good condition. We are

I started last night fine. Then this morning it won't start at all. Cranks and cranks but will not start. New rotor and cap after this mornings failing. Still won't start. I asked him to check spark. He will email back. We live an hour apart. The key trick? I read something about that in this Jeep group. How does it work?

One "key trick" is to turn the key on for a few seconds, then back to off, then to on and start. If this fixes the problem then your issue is with the fuel pressure regulator. You can check this with a pressure gauge on the fuel rail. An old R-12 low side works and they have tools you can borrow from Autozone and possibly PepBoys.

Cutting out "like a switch" indicates a sensor fault. 15 min is too long to be a sensor though, that leads to thermal problems. The CPS sensor could be an issue, but first check codes.

Pulling the codes can be done following the instructions here.

XJ is close enough to the ZJ for that year.

The key trick I was talking about is to turn the key quickly from off to on and back three times, without starting, leaving it in the on position the third time. The computer will then blink out the codes on the check engine light, pausing between each digit. Count the blinks and write down the numbers The final code to come out will be 55.