Engine shuts down while driving

2007 JEEP GRAND CHEROKEE

237,000 MILES • 4.7L • V8 • 4WD • AUTOMATIC

PAULA MONTGOMERY

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I will be driving at normal speed fifty five to sixty mph and engine shuts completely down. I lose all power, I put in neutral and restart it. It is setting no codes. I have replaced the cam and crank sensor and had the computer checked at the Jeep dealer. the throttle positioning sensor and idle control sensor were also replaced within the last two years. Any ideas?

Aug 24, 2017 at 7:05 AM

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This sounds like a classic fuel pump problem, when the engine is not starting can you check the fuel pressure or not hear the fuel pump working in the tank?

Here is a guide that will help you test the fuel pressure.

https://www.2carpros.com/articles/how-to-check-fuel-system-pressure-and-regulator

and if found to be bad here is a guide that will show you what you are in for when doing the job.

https://www.2carpros.com/articles/how-to-replace-an-electric-fuel-pump

Here are some diagrams of what it will be like on your car. (below)

I would also replace the fuel pump and ASD relay.

Please let us know what happens so it will help others.

Cheers, Ken

Images (Click to enlarge)

Aug 25, 2017 at 11:08 AM