After running for ten or fifteen minutes the engine shuts off

GASSED OUT

MEMBER
1999 JEEP GRAND CHEROKEE
4.7L
V8
4WD
AUTOMATIC
130,000 MILES

Vehicle runs for about ten or fifteen minutes and shuts down, even after a fuel pump, filter, and related relays. Seems like something is sending a signal to the fuel pump to shut down then after cool down it will start again for another ten or fifteen minutes. This started last year when the weather was 90 or above and I had no trouble in the winter time. Well here is the summer again and again here we go with the same issue and I could use any advise anyone has as I am totally getting gassed out on this heep problem. Thanks

Monday, July 15th, 2019 AT 1:54 PM

1 Reply

CARADIODOC

MECHANIC
34,330 POSTS

The first step, when this occurs again, is check for loss of spark. Too many people get hung up on the first thing they find missing, but about 95 percent of crank / no-starts are caused by loss of spark, fuel injector pulses, and fuel pump. If you look at any one of those circuits individually, you'll be in the wrong circuit.

Also read and record the diagnostic fault codes. Chrysler made doing that yourself much easier than any other manufacturer. Cycle the ignition switch from "off" to "run" three times within five seconds, leave it in "run", then watch the code numbers appear in the odometer display. You can go here:

https://www.2carpros.com/trouble_codes/obd2/p0400

to see the definitions, or I can interpret them for you. It's important to not disconnect the battery or allow it to run dead or those fault codes will be erased, then that valuable information will be lost.

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Monday, July 15th, 2019 AT 4:05 PM