post #1 of Old 05-23-2014, 10:25 AM Thread Starter
MountainMan303
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1995 ZJ 
 
Join Date: Jan 2014
Location: Boulder
Posts: 20
WJ 4.7 P0340 and P1391

Hi there,

Listen, I have looked into this plenty on the interwebs and am currently just looking for a quick solution/advice from someone who might have had the same problem. I completely understand that this topic has been covered hundreds of times, but I can't find a concrete solution, as this seems to be a complicated issue.

After replacing my girlfriend's crankshaft positioning sensor (Mopar from dealership) over the weekend because of no-starts and stalling issues, her '99 4.7 WJ ran fine for about a day. Now it's throwing P0340 and P1391 codes at me, indicating that something is going wrong with either the CMP or CKP. My only solution right now is to try a camshaft position sensor, and hope that fixes the problem.

Anyone have the same issue, or any advice for me?


1995 ZJ Grand Cherokee 4.0L, 3.5" Iron-Rock Benchmark kit, 31x10.5x15 Duratracs, 15x8 Cragar Soft 8's, Front and Rear Adjustable Tracks, Up-Country Skids
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post #2 of Old 05-23-2014, 01:59 PM Thread Starter
MountainMan303
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1995 ZJ 
 
Join Date: Jan 2014
Location: Boulder
Posts: 20
Can anyone help me with this before the dealership parts store closes today???

1995 ZJ Grand Cherokee 4.0L, 3.5" Iron-Rock Benchmark kit, 31x10.5x15 Duratracs, 15x8 Cragar Soft 8's, Front and Rear Adjustable Tracks, Up-Country Skids
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post #3 of Old 06-09-2014, 03:26 PM
limitmike
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1998 XJ Cherokee 
 
Join Date: Feb 2014
Location: Warsaw
Posts: 85
I have had the same issues. Your best bet is whenever one CMP or CKP goes out replace the other with it and you should be good to go.
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post #4 of Old 06-09-2014, 04:23 PM
miami5th
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2001 WJ 
 
Join Date: Jan 2013
Location: jackson
Posts: 170
I had a failed camshaft position sensor. The jeep would crank and turn over but never fully start. I replaced the CPS with a MOPAR sensor and it fixed the problem a well as the code. The installation was pretty straight forward. CPS is somewhat underneath the battery tray, in that general area.

I had a thread going about CPS removal/reinstall. That thread even has pics. http://www.jeepforum.com/forum/f310/...p0340-1502345/

Hope that helps!
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