need help!! - JeepForum.com
Search  
Sign Up   Today's Posts
User: Pass: Remember?
Advertise Here
Jeep Home Jeep Forum Jeep Classifieds Jeep Registry JeepSpace Jeep Reviews Jeep Gallery Jeep Clubs Jeep Groups Jeep Videos Jeep Events Jeep Articles
Go Back JeepForum.com > Models > Jeep Grand Cherokee & Commander Forums > ZJ Grand Cherokee Forum > need help!!

2014 Spartan Locker Special - While Supplies Last! Dana 3The Original 3/8" Ruffstuff Diff Cover!The RuffStuff "I can't go to EJS" Sale!

Reply
Unread 12-07-2011, 06:32 PM   #1
jtackerman28
Registered User
1997 ZJ 
 
Join Date: Nov 2011
Location: Flint, Michigan
Posts: 2,114
need help!!

Yester day my 1997 4.0 died while driving. It seems to have no spark at all. I just replaced the coil today due to it having several cracks in it and nothing. Has new plugs cap rotor and wires. It is also reading empty on the gas gage while having fuel in it. When I turn the key I can hear the fuel pump running but it doesnt stop running idk if this is normal or not. Any ideas? Thank you I'm trying to avoid halling it to a dealer :/

__________________
3.5 re lift, double sheer front tb, 31" wrangler duratecs
jtackerman28 is offline   Reply With Quote
Unread 12-07-2011, 07:01 PM   #2
pincheburro956
Registered User
2000 XJ Cherokee 
 
Join Date: Jul 2011
Location: Brownsville, Tx
Posts: 949
have you checked the Crank Position Sensor. May be it.
__________________
"Not a single **** shall be given."

99 WJ, 2" BB, 245/75/16 Falken Rocky Mountain ATS.
pincheburro956 is offline   Reply With Quote
Unread 12-07-2011, 07:06 PM   #3
KoreaZJ
Registered User
1994 ZJ 
 
Join Date: Aug 2011
Location: GANGNAM STYLE
Posts: 2,666
Scan it for fault codes to help isolate the problem(s).
KoreaZJ is offline   Reply With Quote
Unread 12-07-2011, 07:29 PM   #4
ZeeJay1997
Registered User
1997 ZJ 
 
Join Date: Dec 2008
Location: Podunk, Alabama
Posts: 5,714
It sound like something has gone wrong with the PCM. A couple of things may be causing it, one is the crank sensor and the other is either of the O2 sensors. The usual failure mode is the PCM will not do anything when one of these shorts out. What you have sounds like a partial failure. Does the check engine light come on for 3 seconds when you turn the switch to the on position? If not, the PCM is definitely malfunctioning.
ZeeJay1997 is offline   Reply With Quote
Unread 12-07-2011, 08:20 PM   #5
jtackerman28
Registered User
1997 ZJ 
 
Join Date: Nov 2011
Location: Flint, Michigan
Posts: 2,114
It isn't and low fuel light comes one. Both o2 sensors are unplugged to rule that out. Where at is the pcm fuse? Not sure have seen a few diffrent thing. And should I just go ahead and change the crank sensor?
__________________
3.5 re lift, double sheer front tb, 31" wrangler duratecs
jtackerman28 is offline   Reply With Quote
Unread 12-07-2011, 08:33 PM   #6
ZeeJay1997
Registered User
1997 ZJ 
 
Join Date: Dec 2008
Location: Podunk, Alabama
Posts: 5,714
have u been wheeling lately? check for shorted wires near drive train. the fuse for pcm is in the power box under the hood. if its blown, the o2 wiring is suspect. the crank sensor is still suspect too unplug it before changing the fuse if fuse is blown.
ZeeJay1997 is offline   Reply With Quote
Unread 12-07-2011, 08:35 PM   #7
jtackerman28
Registered User
1997 ZJ 
 
Join Date: Nov 2011
Location: Flint, Michigan
Posts: 2,114
A lil wheeling nothing to serious. What size fuse is it?
__________________
3.5 re lift, double sheer front tb, 31" wrangler duratecs
jtackerman28 is offline   Reply With Quote
Unread 12-07-2011, 08:37 PM   #8
ZeeJay1997
Registered User
1997 ZJ 
 
Join Date: Dec 2008
Location: Podunk, Alabama
Posts: 5,714
i think its small blue 15 amp
ZeeJay1997 is offline   Reply With Quote
Unread 12-07-2011, 08:48 PM   #9
jtackerman28
Registered User
1997 ZJ 
 
Join Date: Nov 2011
Location: Flint, Michigan
Posts: 2,114
I check that and its good. Where from here? Like what should I checl next
__________________
3.5 re lift, double sheer front tb, 31" wrangler duratecs
jtackerman28 is offline   Reply With Quote
Unread 12-07-2011, 09:00 PM   #10
ZeeJay1997
Registered User
1997 ZJ 
 
Join Date: Dec 2008
Location: Podunk, Alabama
Posts: 5,714
take ther crank sensor loose connector and see if the 3 second CEL comes back
ZeeJay1997 is offline   Reply With Quote
Unread 12-07-2011, 09:02 PM   #11
jtackerman28
Registered User
1997 ZJ 
 
Join Date: Nov 2011
Location: Flint, Michigan
Posts: 2,114
You mean unplug it? Then check?
__________________
3.5 re lift, double sheer front tb, 31" wrangler duratecs
jtackerman28 is offline   Reply With Quote
Unread 12-07-2011, 09:03 PM   #12
ZeeJay1997
Registered User
1997 ZJ 
 
Join Date: Dec 2008
Location: Podunk, Alabama
Posts: 5,714
yes unplug it, turn the switch on, and see if your fuel pump, cel and fuel gage work
ZeeJay1997 is offline   Reply With Quote
Unread 12-07-2011, 09:04 PM   #13
jtackerman28
Registered User
1997 ZJ 
 
Join Date: Nov 2011
Location: Flint, Michigan
Posts: 2,114
If yes whats that mean? If no that also? Thanks for the help!!
__________________
3.5 re lift, double sheer front tb, 31" wrangler duratecs
jtackerman28 is offline   Reply With Quote
Unread 12-07-2011, 09:05 PM   #14
ZeeJay1997
Registered User
1997 ZJ 
 
Join Date: Dec 2008
Location: Podunk, Alabama
Posts: 5,714
did you check all the fuses under the hood??
ZeeJay1997 is offline   Reply With Quote
Unread 12-07-2011, 09:06 PM   #15
ZeeJay1997
Registered User
1997 ZJ 
 
Join Date: Dec 2008
Location: Podunk, Alabama
Posts: 5,714
your using the process of elimination... if you unplug it and the PCM works, the crank sensor is bad
ZeeJay1997 is offline   Reply With Quote




Jeep, Wrangler, Cherokee, Grand Cherokee, and other models are copyrighted and trademarked to Jeep/Chrysler Corporation. JeepForum.com is not in any way associated with Jeep or the Chrysler Corp.