96 zj wont start - JeepForum.com

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post #1 of 18 Old 08-17-2013, 02:05 PM Thread Starter
iceman10058
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1996 ZJ 
 
Join Date: Sep 2011
Location: Apple Valley
Posts: 15
96 zj wont start

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

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post #2 of 18 Old 08-17-2013, 02:40 PM
ZeeJay1997
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1997 ZJ 
 
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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.
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post #3 of 18 Old 08-17-2013, 06:36 PM Thread Starter
iceman10058
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1996 ZJ 
 
Join Date: Sep 2011
Location: Apple Valley
Posts: 15
no cam sensor and no security system
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post #4 of 18 Old 08-17-2013, 06:44 PM
ZeeJay1997
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unless you have a special engine, your cam sensor is in the distributor.
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post #5 of 18 Old 08-17-2013, 10:34 PM Thread Starter
iceman10058
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1996 ZJ 
 
Join Date: Sep 2011
Location: Apple Valley
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....
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post #6 of 18 Old 08-17-2013, 11:26 PM
Oldfrog
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2007 WK 
 
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Location: Louisiana/Texas
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Code 11 is a crank sensor, isnt it?

2007 5.7 Hemi, Ltd. QD II -
1997 ZJ, 4,0 select trac, Up country, track lok.
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post #7 of 18 Old 08-18-2013, 07:37 AM Thread Starter
iceman10058
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1996 ZJ 
 
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Location: Apple Valley
Posts: 15
crank and cam,but they both test fine....
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post #8 of 18 Old 08-18-2013, 09:14 AM
ZeeJay1997
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1997 ZJ 
 
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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?
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post #9 of 18 Old 08-18-2013, 12:16 PM
Rich93ZJ
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1993 ZJ 
 
Join Date: Sep 2012
Location: Richland
Posts: 461
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
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post #10 of 18 Old 08-18-2013, 06:01 PM Thread Starter
iceman10058
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1996 ZJ 
 
Join Date: Sep 2011
Location: Apple Valley
Posts: 15
lol the pcm is bad, im getting power to it but no signal out
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post #11 of 18 Old 08-18-2013, 09:37 PM
Oldfrog
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2007 WK 
 
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Location: Louisiana/Texas
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"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.

2007 5.7 Hemi, Ltd. QD II -
1997 ZJ, 4,0 select trac, Up country, track lok.
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post #12 of 18 Old 08-23-2013, 12:36 PM Thread Starter
iceman10058
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1996 ZJ 
 
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Location: Apple Valley
Posts: 15
tested the crank sensor properly, it is fine, replaced the pcm and cam sensor and it still wont start
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post #13 of 18 Old 08-23-2013, 01:31 PM
Oldfrog
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Swap the horn relay with the ASD relay ( assuming the horn blows OK).

2007 5.7 Hemi, Ltd. QD II -
1997 ZJ, 4,0 select trac, Up country, track lok.
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post #14 of 18 Old 08-23-2013, 10:42 PM
mtnsammy
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1990 XJ Cherokee 
 
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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.
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post #15 of 18 Old 08-24-2013, 08:37 AM
ZeeJay1997
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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.
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