No spark wj - JeepForum.com
 
LinkBack Thread Tools
post #1 of 8 Old 08-31-2017, 08:34 PM Thread Starter
njc2rn
Registered User
2001 WJ 
 
Join Date: Jan 2014
Location: Everw
Posts: 13
No spark wj

Hi! I have a 2001 WJ with a replaced 4.7l engine with about 25k miles on it. I replaced the engine myself about 2 years ago. Has a new tps and crank position sensor.

Anyways, a few days ago upon hard acceleration felt a knock in drive train and jeep died. Now it will turn over but not start. Fuel rail is pressurized but doesn't seem to have spark, pulled number 1 coil and tested with plug in and no spark. I get no error codes.

I'm stumped. Any ideas?

Ecu??

njc2rn is offline  
Sponsored Links
Advertisement
 
post #2 of 8 Old 09-01-2017, 02:40 PM Thread Starter
njc2rn
Registered User
2001 WJ 
 
Join Date: Jan 2014
Location: Everw
Posts: 13
Okay finally got a code p0340.. which I replaced when I out in the engine.. replaced camshaft position sensor again today.. still same code and no start.

Slipped timing chain?
njc2rn is offline  
post #3 of 8 Old 09-13-2017, 04:15 PM Thread Starter
njc2rn
Registered User
2001 WJ 
 
Join Date: Jan 2014
Location: Everw
Posts: 13
Thought I'd bumpo this as I'm getting nowhere.. Any one have any ideas?
njc2rn is offline  
 
post #4 of 8 Old 09-20-2017, 04:17 PM
flon_klar
Registered User
2000 WJ 
 
Join Date: Jun 2016
Location: Salt Lake City
Posts: 25
When I've had similar issues before, it's been either the crankshaft position sensor or the auto shut down relay.
flon_klar is offline  
post #5 of 8 Old 09-21-2017, 08:26 PM
jclaudii
Registered User
1999 WJ 
 
Join Date: Oct 2004
Location: Russellville, ar
Posts: 1,323
Quote:
Originally Posted by njc2rn View Post
Thought I'd bumpo this as I'm getting nowhere.. Any one have any ideas?
Could be those new cam or crank sensors. I have had to go through a few to get one that works reliably sometimes. Make sure grounds are all good. Are dash gages acting weird?
jclaudii is offline  
post #6 of 8 Old 09-23-2017, 12:07 AM
rep-tile
Cash 4 Clunkers Survivor
 
rep-tile's Avatar
2004 WJ 
 
Join Date: Jul 2013
Location: bakersfield
Posts: 1,259
The camshaft positions sensor has no effect on spark, its only purpose is to sync the fuel injectors. A bad crankshaft position sensor on the other hand would give you no spark. You want an OEM replacement only. Could be a bad ECU too, potentially.

04 WJ 4.0 - Avital 4103, DB-ALL
91 XJ 4.0 - Avital 4103, Stage-2 aFe intake system, BBK high flow Throttle Body, Jones Exhaust A3518M-5
rep-tile is offline  
post #7 of 8 Old 09-24-2017, 09:19 AM Thread Starter
njc2rn
Registered User
2001 WJ 
 
Join Date: Jan 2014
Location: Everw
Posts: 13
I am still gettiing the p0340 camshaft position sensor code, which I changed and still that code. Would a slipped timing chain give me that code and now spark? It was a sudden failure.... so weird. I will try changing iif t again with an OEM.. as well as crank position sensor.

Any easy way to tell if timing chain slipped? Besides compression.. (I need to buy a tester)
njc2rn is offline  
post #8 of 8 Old 09-25-2017, 09:29 AM
86cj74.2L
Web Wheeler
 
86cj74.2L's Avatar
2004 WJ 
 
Join Date: Jul 2006
Location: Stouchsburg, PA
Posts: 11,046
Quote:
Originally Posted by njc2rn
I am still gettiing the p0340 camshaft position sensor code, which I changed and still that code. Would a slipped timing chain give me that code and now spark? It was a sudden failure.... so weird. I will try changing iif t again with an OEM.. as well as crank position sensor. Any easy way to tell if timing chain slipped? Besides compression.. (I need to buy a tester)
that "no cam signal at PCM could be bad wiring, bad sensor, something wrong with the tone ring on the cam, or PCM itself.

The connector is on the replacement sensor correctly and securely with the red tab pushed over to lock it in place?

Checking the wires for continuity between the sensor connector and the PCM harness plug would be next.
86cj74.2L 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