jeep about left me stranded @ Mcdonalds on my lunch break -
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post #1 of 9 Old 11-22-2010, 11:53 AM Thread Starter
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1996 ZJ 
Join Date: Oct 2010
Location: rogersville
Posts: 46
jeep about left me stranded @ Mcdonalds on my lunch break

96 JGC 4.0 4x4 My jeep died on me @ Mcdonalds and it took a good 5 minutes to get it cranked...while on my way back to work it was spitting and sputtering and dying the whole way back.It did throw a CEL.. So i left the jeep at work that night and the next day i came back to take it to Autozone,it made it there fine no problems...They printed something off the computer to give to me because they couldnt make any sense of it so here it is Troubleshooting P1391 Definition: CMP or CKP signal intermittent condition. Explanation: The ECM detected the actual CMP position disagreed with the expected CMP level. Probable cause: 1. Timing belt or chain stretched or jumped. 2. Defective CMP sensor It would really help to know what the CMP or CKP sensor is

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post #2 of 9 Old 11-22-2010, 12:41 PM
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2006 WK 
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CMP's the Camshaft Position sensor, CKP's the Crankshaft Position sensor.

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post #3 of 9 Old 11-22-2010, 12:43 PM
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1996 ZJ 
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if its the crank have fun replacing it. its a tight fit right on top of the transmission bell housing


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post #4 of 9 Old 11-22-2010, 01:14 PM
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I would bet on the cam shaft position sensor. It is under the distributor cap and rotor.

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post #5 of 9 Old 11-22-2010, 02:16 PM
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1998 ZJ 
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That's what you get for eating at McDonalds.
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post #6 of 9 Old 11-22-2010, 10:21 PM Thread Starter
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1996 ZJ 
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Location: rogersville
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thanks guys looks like i can test both sensors to make sure their bad....gonna get to that tomorrow...ill keep ya posted
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post #7 of 9 Old 11-22-2010, 10:23 PM
Genius with this metal
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1993 XJ Cherokee 
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Location: New York
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they will hire anyone at autozone. I was the only person at mine who actually knew **** about cars.
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post #8 of 9 Old 11-23-2010, 07:38 AM
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2007 JK Wrangler 
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does it fire up when it is cold and get worse as you drive? if so it's your crankshaft sensor at the top of your tranny bell housing.
to test the crank sensor, boil water stick it in the water and test it when hot. the heat from your torque converter damages those things. They are only made of plastic and is susceptible to heat damage. They will usually work when cold and flake out when hot.
I just reread your post and yes, it sounds exactly like a crank sensor issue, had this happen twice in my life time.

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post #9 of 9 Old 11-23-2010, 06:30 PM
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Originally Posted by Technohead View Post
That's what you get for eating at McDonalds.
hahaha!!! That is what I thought as soon as I read the title!

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