WJ 4.7 P0340 and P1391 - JeepForum.com
 
LinkBack Thread Tools
post #1 of 4 Old 05-23-2014, 10:25 AM Thread Starter
MountainMan303
Registered User
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
MountainMan303 is offline  
Sponsored Links
Advertisement
 
post #2 of 4 Old 05-23-2014, 01:59 PM Thread Starter
MountainMan303
Registered User
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
MountainMan303 is offline  
post #3 of 4 Old 06-09-2014, 03:26 PM
limitmike
Registered User
1998 XJ Cherokee 
 
Join Date: Feb 2014
Location: Warsaw
Posts: 86
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.
limitmike is offline  
 
post #4 of 4 Old 06-09-2014, 04:23 PM
miami5th
Registered User
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!
miami5th is offline  
Reply

Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the JeepForum.com forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.

Password:


Confirm Password:
Email Address
Please enter a valid e-mail address for yourself.



Email Address:
OR

Log-in









Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.




Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page



Posting Rules  
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are On
Refbacks are On

 
For the best viewing experience please update your browser to Google Chrome