2002 Jeep Grand Cherokee Limited 4.7 H.O Randomly Turns Off While Driving - JeepForum.com
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post #1 of 10 Old 10-12-2021, 08:06 AM Thread Starter
ChrisBro
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2002 Jeep Grand Cherokee Limited 4.7 H.O Randomly Turns Off While Driving

My 02 is turning off randomly about once a day. I can be driving down the highway or down the street, it doesn't matter then I loose power, the RPM's needle starts jumping around and I have to pull over, turn it off and turn it back on. Then everything is fine as if nothing ever happened!

Any ideas or input would be appreciated. I have replaced both crank and cam position sensors about a month ago.

Thank you in advance.

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post #2 of 10 Old 10-12-2021, 08:20 AM
AVR2
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Did you replace with OEM sensors, or aftermarket?

First step to dealing with random shutdowns while driving is usually to check and clean all the engine grounds. Jeeps are *very* picky about decent grounds.
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post #3 of 10 Old 10-12-2021, 08:43 AM Thread Starter
ChrisBro
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No not OEM.
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post #4 of 10 Old 10-12-2021, 02:31 PM
CraigMBAx
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Quote:
Any ideas or input would be appreciated. I have replaced both crank and cam position sensors about a month ago.
The crank and cam sensors won't cause a shutdown like that.

Quote:
No not OEM.
I'd put the old parts back in and save the new ones as known good spares as they aren't OEM.

You'll have to diagnose this yourself. It could be a host of functions, from a loose connector, to a failing wiring harness, or a failed ECM.

https://medium.com/@autorepairguruwr...m-7ee6fd8b4363

This article might help. So will copious notes. But either way it's going to be a long and arduous process.

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post #5 of 10 Old 10-12-2021, 02:34 PM
nickfast
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What was the reason for replacing the sensors? Have you checked for codes?
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post #6 of 10 Old 10-12-2021, 04:28 PM
AVR2
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Quote:
Originally Posted by ChrisBro View Post
No not OEM.
First rule of Jeep sensors - if they're engine- or transmission-critical, *always* use OEM.
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post #7 of 10 Old 10-13-2021, 05:23 AM
mak_v8
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Second rule of Jeep sensors: a new OEM sensor could be bad in the box..., keep receipt and packaging in case of a warranty change

Grand Cherokee WJ 4.7 V8 HO. m.y. 2002
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post #8 of 10 Old 10-13-2021, 06:19 AM
Bigrigr
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Craigmbax has a great place to start. Clean grounds are essential on these Jeeps, and the very first place to start is at the Battery itself. Make sure the connections are absolutely spotless of corrosion. And tight. If someone has cut the cable ends off, and added the cheesy aftermarket clamp on style ends, they are a magnet for looseness and corrosion.

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post #9 of 10 Old 10-13-2021, 11:14 AM
Delta0
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Has anyone suggested a dicky ignition switch?

After all, your ignition switch is the only thing you fiddle with before your engine starts.
A quick squirt of your favourite lube down keyhole could be just what the doc ordered..
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post #10 of 10 Old 10-13-2021, 12:23 PM
Waterluvr
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The pcb is likely failing in your pcm module that operates the ASD relay, most common failure seen on bad Chrysler pcm's. It will get worse over time, the jeep will shut off more often and eventually become a crank no start problem.
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