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XJ Ask the Question Thread
Still battling a no-start problem.
replaced CPS twice, most recently with a mopar one. No luck.
Not getting spark, hooked a test light up to the wire coming from the coil, when I crank it the light comes on very briefly and dimly and goes right out.
I've heard the pick-up coil in the distributor can go bad, as well as the PCM but it was replaced in '08
Any testing procedures I need to try? I can work a multimeter just fine.
replaced CPS twice, most recently with a mopar one. No luck.
Not getting spark, hooked a test light up to the wire coming from the coil, when I crank it the light comes on very briefly and dimly and goes right out.
I've heard the pick-up coil in the distributor can go bad, as well as the PCM but it was replaced in '08
Any testing procedures I need to try? I can work a multimeter just fine.
::CF Moderator::
Joined: Aug 2011
Posts: 43,971
Likes: 1,578
From: Prescott, Az
Year: 1990
Model: Cherokee (XJ)
Engine: 4.0
Still battling a no-start problem.
replaced CPS twice, most recently with a mopar one. No luck.
Not getting spark, hooked a test light up to the wire coming from the coil, when I crank it the light comes on very briefly and dimly and goes right out.
I've heard the pick-up coil in the distributor can go bad, as well as the PCM but it was replaced in '08
Any testing procedures I need to try? I can work a multimeter just fine.
replaced CPS twice, most recently with a mopar one. No luck.
Not getting spark, hooked a test light up to the wire coming from the coil, when I crank it the light comes on very briefly and dimly and goes right out.
I've heard the pick-up coil in the distributor can go bad, as well as the PCM but it was replaced in '08
Any testing procedures I need to try? I can work a multimeter just fine.
Senior Member
Joined: Feb 2014
Posts: 854
Likes: 1
From: Minnesota
Year: 1996
Model: Cherokee
Engine: 4.0
What would cause coolant to spit out the under side of the radiator cap? Just got home from work about 5 minutes ago, after i parked it i popped the hood just to watch if anything would happen then 20 seconds later it started coming out under the cap. It was a steady stream too. I'm thinking my overflow hose might be plugged? Not sure what other possibilities there could be...
::CF Moderator::
Joined: Aug 2011
Posts: 43,971
Likes: 1,578
From: Prescott, Az
Year: 1990
Model: Cherokee (XJ)
Engine: 4.0
What would cause coolant to spit out the under side of the radiator cap? Just got home from work about 5 minutes ago, after i parked it i popped the hood just to watch if anything would happen then 20 seconds later it started coming out under the cap. It was a steady stream too. I'm thinking my overflow hose might be plugged? Not sure what other possibilities there could be...
Herp Derp Jerp

Joined: Nov 2011
Posts: 18,251
Likes: 17
From: Parham, ON
Year: 1999
Model: Cherokee
Engine: 4.0L OBD-II
::CF Moderator::
Joined: Aug 2011
Posts: 43,971
Likes: 1,578
From: Prescott, Az
Year: 1990
Model: Cherokee (XJ)
Engine: 4.0
CF Veteran
Joined: Apr 2014
Posts: 1,028
Likes: 0
From: Hagerstown MD
Year: 93
Model: Cherokee
Engine: 4.0 I6 w/Flux Capacitor
Used that to do a few roofs with my dad. Smells pretty bad, kinda that "burning toxic losing my nose hairs smell" THAT is how you know its working 
Also that small metal flap in my gas filler slot doesn't close all the way anymore...should i care?

Also that small metal flap in my gas filler slot doesn't close all the way anymore...should i care?
::CF Moderator::
Joined: Aug 2011
Posts: 43,971
Likes: 1,578
From: Prescott, Az
Year: 1990
Model: Cherokee (XJ)
Engine: 4.0
They have ALL types of that stuff!!
Senior Member
Joined: Feb 2014
Posts: 854
Likes: 1
From: Minnesota
Year: 1996
Model: Cherokee
Engine: 4.0
Update #2 after even more troubleshooting the blower motor...
Blower motor operating only on "number 4" setting in 2000 XJ.
1. Replaced Blower Motor Resistor - no change
2. Tried system without BMR - no change
3. Verified ohms across Blower Motor Resistor - new same as old
4. Verified 12V present at correct wires going into BMR when switch changed (switch is good)
5. Jumped wires on resistor plug (so 12v would pass through at any setting - blower worked... confirms circuit complete)
6. Confirmed no voltage at blower motor in setting 1, 2, or 3 with either BMR
7. Replaced relay (just to try it?)
Basically, nothing I've tried has worked. I'm not sure what the odds are that my old BMR and new BMR are both bad, but I guess that's my next guess.
I could did into wiring, but I feel like I've confirmed that's good by jumping the wires at the BMR plug.. ie, voltage passes through when jumped and makes it to the blower motor, but not when the BMR is plugged in.
If anyone has a suggestion, I'll happily take it.
Blower motor operating only on "number 4" setting in 2000 XJ.
1. Replaced Blower Motor Resistor - no change
2. Tried system without BMR - no change
3. Verified ohms across Blower Motor Resistor - new same as old
4. Verified 12V present at correct wires going into BMR when switch changed (switch is good)
5. Jumped wires on resistor plug (so 12v would pass through at any setting - blower worked... confirms circuit complete)
6. Confirmed no voltage at blower motor in setting 1, 2, or 3 with either BMR
7. Replaced relay (just to try it?)
Basically, nothing I've tried has worked. I'm not sure what the odds are that my old BMR and new BMR are both bad, but I guess that's my next guess.
I could did into wiring, but I feel like I've confirmed that's good by jumping the wires at the BMR plug.. ie, voltage passes through when jumped and makes it to the blower motor, but not when the BMR is plugged in.
If anyone has a suggestion, I'll happily take it.




