No spark -- Need help
03-01-2021, 10:14 AM
#1
Newbie
Thread Starter
No spark -- Need help
Morning Ya'll. I have an interesting problem on my hands that I have been throwing parts at with no luck fixing.
I have a 96 XJ, 160k miles, 4.0 AT.
Ran fine until two weeks ago. My brother was driving so these are his words "it was driving fine, but the RPMs dropped a few times, and it had almost died. Then 10-15 minutes later, it died while driving, and would not start again."
First thing i checked was fuel delivery. Pump is fine, and there is pressure in the rail.
next I checked for spark, and there is none
There is no CEL
I changed:
engine coil
Crank position sensor
distributor cap and rotor.
Camshaft position sensor
Still no spark for any plugs. I highly doubt that all 6 spark plugs went bad at the same time, but I do plan on changing them next.
If anyone has any input as to what I should be doing, let me know. I really need this thing running and out of the garage.
I have a 96 XJ, 160k miles, 4.0 AT.
Ran fine until two weeks ago. My brother was driving so these are his words "it was driving fine, but the RPMs dropped a few times, and it had almost died. Then 10-15 minutes later, it died while driving, and would not start again."
First thing i checked was fuel delivery. Pump is fine, and there is pressure in the rail.
next I checked for spark, and there is none
There is no CEL
I changed:
engine coil
Crank position sensor
distributor cap and rotor.
Camshaft position sensor
Still no spark for any plugs. I highly doubt that all 6 spark plugs went bad at the same time, but I do plan on changing them next.
If anyone has any input as to what I should be doing, let me know. I really need this thing running and out of the garage.
Last edited by Ruvim Boyko; 03-01-2021 at 11:46 AM. Reason: Changed the coil
03-01-2021, 11:40 AM
#2
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Join Date: Nov 2010
Location: In the middle of Minnesota!
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Year: 1999
Model: Cherokee
Engine: 4.0
Test your COIL. They can be tested for both primary and secondary resistance values with a meter and a manual.
I see that you recently edited your post after I posted this that you changed the coil.
I see that you recently edited your post after I posted this that you changed the coil.
Last edited by tjwalker; 03-01-2021 at 01:03 PM.
03-01-2021, 01:13 PM
#3
CF Veteran
03-01-2021, 01:31 PM
#7
Newbie
Thread Starter
No error codes
Was really hoping no one would say this....
but yes, I have a multimeter
Was really hoping no one would say this....
but yes, I have a multimeter
Last edited by Ruvim Boyko; 03-01-2021 at 01:32 PM. Reason: Finished my sentence
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03-01-2021, 02:16 PM
#8
CF Veteran
03-01-2021, 05:06 PM
#9
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Join Date: Nov 2010
Location: In the middle of Minnesota!
Posts: 5,813
Received 104 Likes
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Year: 1999
Model: Cherokee
Engine: 4.0
Spark: 12 volts from ignition switch to the ASD relay; when the key is first turned on the PCM provides a ground to the ASD relay to energize it, then the ASD relay passes 12 volts to the coil primary side. If no crank sensor signal is generated after a couple of seconds the PCM cuts the ground to the ASD relay (and fuel pump relay too) and that cuts power to the coil (and fuel pump). Key to START and once again the PCM energizes the ASD relay. Now, a critical element is the crank sensor--no signal from the crank sensor and the PCM won't trigger the coil to provide spark.
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