96 zj wont start - 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 > 96 zj wont start

FS: 2007-2013 Jeep Wrangler "HALO" Angel Eye KitFlowmaster's Force II Axle-back exhaust system for the 201FS: Wranger BRIGHT License Plate LED! Just $3! Great value

Reply
Unread 08-17-2013, 02:05 PM   #1
iceman10058
Registered User
1996 ZJ 
 
Join Date: Sep 2011
Location: Apple Valley, Ca
Posts: 15
96 zj wont start

wont start, have good fuel, spark and compression, ideas? was running fine just yesterday

iceman10058 is offline   Reply With Quote
Unread 08-17-2013, 02:40 PM   #2
ZeeJay1997
Registered User
1997 ZJ 
 
Join Date: Dec 2008
Location: Sweet Home, Alabama
Posts: 6,176
Place a long screwdriver or mechanic's stethoscope against the injectors while cranking. do they click? if not cam sensor is or its connection is bad


if it runs for a few seconds and stops, the security system is suspect.
ZeeJay1997 is offline   Reply With Quote
Unread 08-17-2013, 06:36 PM   #3
iceman10058
Registered User
1996 ZJ 
 
Join Date: Sep 2011
Location: Apple Valley, Ca
Posts: 15
no cam sensor and no security system
iceman10058 is offline   Reply With Quote
Unread 08-17-2013, 06:44 PM   #4
ZeeJay1997
Registered User
1997 ZJ 
 
Join Date: Dec 2008
Location: Sweet Home, Alabama
Posts: 6,176
unless you have a special engine, your cam sensor is in the distributor.
ZeeJay1997 is offline   Reply With Quote
Unread 08-17-2013, 10:34 PM   #5
iceman10058
Registered User
1996 ZJ 
 
Join Date: Sep 2011
Location: Apple Valley, Ca
Posts: 15
ok, replaced cam sensor, the part store wanted to call it something else, but still wont get spark, so not sure where else it is. crank sensor is still good, but im getting a code 11 still.tnt in the gas tank is soooo tempting now....
iceman10058 is offline   Reply With Quote
Unread 08-17-2013, 11:26 PM   #6
Oldfrog
Web Wheeler
1997 ZJ 
 
Join Date: Feb 2008
Location: Louisiana/Texas
Posts: 3,589
Code 11 is a crank sensor, isnt it?
__________________
Cajun Recipes and Fishing tips

Words of wisdom, Posted by Zeejay:
"..it's not air, it is the opposite of air... suckage so to speak."

Stalling? Work through Zeejay's list
Oldfrog is offline   Reply With Quote
Unread 08-18-2013, 07:37 AM   #7
iceman10058
Registered User
1996 ZJ 
 
Join Date: Sep 2011
Location: Apple Valley, Ca
Posts: 15
crank and cam,but they both test fine....
iceman10058 is offline   Reply With Quote
Unread 08-18-2013, 09:14 AM   #8
ZeeJay1997
Registered User
1997 ZJ 
 
Join Date: Dec 2008
Location: Sweet Home, Alabama
Posts: 6,176
Quote:
Originally Posted by ZeeJay1997 View Post
Place a long screwdriver or mechanic's stethoscope against the injectors while cranking. do they click?
Did you do this?
ZeeJay1997 is offline   Reply With Quote
Unread 08-18-2013, 12:16 PM   #9
Rich93ZJ
Registered User
1993 ZJ 
 
Join Date: Sep 2012
Location: Richland, Ga
Posts: 452
Did you check the fuses under the hood. If pcm fuse is popped, check your wiring to the O2 sensors and of course replace the fuse
__________________
93 ZJ 5.2V8 3.5 iro 31x10.5
08 Silverado 6in lift 35's
Rich93ZJ is offline   Reply With Quote
Unread 08-18-2013, 06:01 PM   #10
iceman10058
Registered User
1996 ZJ 
 
Join Date: Sep 2011
Location: Apple Valley, Ca
Posts: 15
lol the pcm is bad, im getting power to it but no signal out
iceman10058 is offline   Reply With Quote
Unread 08-18-2013, 09:37 PM   #11
Oldfrog
Web Wheeler
1997 ZJ 
 
Join Date: Feb 2008
Location: Louisiana/Texas
Posts: 3,589
"No signal out.."
Do you mean that the 5 volt supply to the sensors from the PCM is not present?

Might try cleaning the PCM ground below the coil.
I'd also check the ASD fuse and relay under the hood.

Do a youtube search on "chrylser hall effect sensor". There's a video showing how to test the crank sensor properly.
__________________
Cajun Recipes and Fishing tips

Words of wisdom, Posted by Zeejay:
"..it's not air, it is the opposite of air... suckage so to speak."

Stalling? Work through Zeejay's list
Oldfrog is offline   Reply With Quote
Unread 08-23-2013, 12:36 PM   #12
iceman10058
Registered User
1996 ZJ 
 
Join Date: Sep 2011
Location: Apple Valley, Ca
Posts: 15
tested the crank sensor properly, it is fine, replaced the pcm and cam sensor and it still wont start
iceman10058 is offline   Reply With Quote
Unread 08-23-2013, 01:31 PM   #13
Oldfrog
Web Wheeler
1997 ZJ 
 
Join Date: Feb 2008
Location: Louisiana/Texas
Posts: 3,589
Swap the horn relay with the ASD relay ( assuming the horn blows OK).
__________________
Cajun Recipes and Fishing tips

Words of wisdom, Posted by Zeejay:
"..it's not air, it is the opposite of air... suckage so to speak."

Stalling? Work through Zeejay's list
Oldfrog is offline   Reply With Quote
Unread 08-23-2013, 10:42 PM   #14
mtnsammy
Registered User
1990 XJ Cherokee 
 
Join Date: Mar 2006
Posts: 80
OK both OP and I have been crunching on this. The only suspect issue is using a test light on cranking and checking for juice to distributor we get no flashing light. The only issue is spark. I am not sure if the 96 Grand Cherokee is supposed to work with an OBDII reader but this one will not read codes without using the key on/ off method. When I checked the Crank Sensor it showed 000 for resistance. We will pull it and recheck while it is out too. I used my multi meter and found the 5 volts everywhere fine. Again the only problem is power to distributor.

When key is turned on we get 12v to coil for 1 second then the relays all click and out goes the 12v. While cranking still no 12v. I have tested all the relays and swapped sever times for giggles. No chnage. All fuses are good and show 12 v both sides with key on. I have read and tried all the sticky notes for common causes. Next trip to the jeep I will retest with the new PCM. Per my kid nothing changed.

Motor turns over well. RPM while cranking is good. Battery contacts are clean and fuses are clean. All relays tested good. THe only issue I can find is no spark due to no 12v to coil.

Where would the security box be on a 96 and is there a test for the box as well?

35 yrs turning wrenches and this is a bit annoying.
mtnsammy is offline   Reply With Quote
Unread 08-24-2013, 08:37 AM   #15
ZeeJay1997
Registered User
1997 ZJ 
 
Join Date: Dec 2008
Location: Sweet Home, Alabama
Posts: 6,176
Quote:
Originally Posted by mtnsammy View Post
When I checked the Crank Sensor it showed 000 for resistance. We will pull it and recheck while it is out too.
That means it's shorted. Sounds bad. It should check above 10K. Use this method

Quote:
Originally Posted by mtnsammy View Post
The only suspect issue is using a test light on cranking and checking for juice to distributor we get no flashing light.
The crank sensor signal is a prerequisite for the PCM to send a firing pulse. If it doesn't like what it's seeing, it doesn't fire the coil.

Quote:
Originally Posted by mtnsammy View Post
While cranking still no 12v.
If you go from the green wire positive to battery negative with your light you should see the output of the ASD relay during key on ( one second), starting and running (if it ran).

Quote:
Originally Posted by mtnsammy View Post
I am not sure if the 96 Grand Cherokee is supposed to work with an OBDII reader but this one will not read codes without using the key on/ off method.
When the crank sensor shorts, it sometimes causes other functions of the PCM to be inop.

Quote:
Originally Posted by mtnsammy View Post
Where would the security box be on a 96 and is there a test for the box as well?
Not that I think security is the issue since you posted more details, but the security is inside the BCM.

The code 11 mentioned earlier can be for a cam or crank sensor. since yours had a sudden death and based on the above, the crank sensor is a safe bet.
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.