No spark
Thread Starter
Seasoned Member
Joined: Jul 2009
Posts: 398
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From: Bremerton
Year: 87
Model: Cherokee
Engine: 4.0
No spark
As the title says I have no spark on my 87 xj with 4.0. I recently replaced plugs cap and rotor. It ran fine then it sat for a couple weeks and then no start. Checked cps and it tested bad so I replaced it. Still no spark again tested cps and it is only putting out .3 vac not the .5 vac like it should. Well I replaced it again and still only at .3vac. I took the coil and icm in and they both tested good. Where do I go next? Is it possible to get 3 bad new sensors?
Seasoned Member
Joined: Aug 2013
Posts: 452
Likes: 3
From: Duluth, MN
Year: 1999
Model: Cherokee
Engine: 4.0 I6
What type of sensor are you buying?
Only replace the CPS with a Mopar factory replacement. It costs a little more but our jeeps do NOT like those aftermarket sensors.
Only replace the CPS with a Mopar factory replacement. It costs a little more but our jeeps do NOT like those aftermarket sensors.
Newbie
Joined: Jan 2012
Posts: 23
Likes: 0
From: kansas city
Year: 1999
Model: Cherokee
Engine: 4.0L
Something simple? Fuse?
You may have already checked this, but I believe there is a ECM fuse somewhere. Probably in the fuse block under the hood. Ive been burned by this once. Is the coil getting a signal? I imagine there is a way to test the coil...
Sorry not more help
Sorry not more help
::CF Moderator::
Joined: Aug 2011
Posts: 43,971
Likes: 1,577
From: Prescott, Az
Year: 1990
Model: Cherokee (XJ)
Engine: 4.0
OP, click on my link below and read Tip 7.
Would never hurt for you to do Tips 1,3,4, and 5 anyway.
::CF Moderator::
Joined: Aug 2011
Posts: 43,971
Likes: 1,577
From: Prescott, Az
Year: 1990
Model: Cherokee (XJ)
Engine: 4.0
Thread Starter
Seasoned Member
Joined: Jul 2009
Posts: 398
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From: Bremerton
Year: 87
Model: Cherokee
Engine: 4.0
Okay went through refreshed all grounds cleaned connections and still only .25-..3 vac from cps. Do you think it could possibly the flex plate not spinning fast enough? I have
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Thread Starter
Seasoned Member
Joined: Jul 2009
Posts: 398
Likes: 0
From: Bremerton
Year: 87
Model: Cherokee
Engine: 4.0
Okay went through refreshed all grounds cleaned connections and still only .25-..3 vac from cps. Do you think it could possibly the flex plate not spinning fast enough?
Thread Starter
Seasoned Member
Joined: Jul 2009
Posts: 398
Likes: 0
From: Bremerton
Year: 87
Model: Cherokee
Engine: 4.0
Gone through did tip 4 and drilled the upper hole to 3/8 for a stronger signal. Now I'm getting .3-.35 vac which is more than before this leads me to believe I might be getting weak magnets. I'm at a complete lose.
Senior Member
Joined: Jul 2011
Posts: 560
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From: West Covina, Ca.
Year: 1988
Model: Cherokee
Engine: 4.0
::CF Moderator::
Joined: Aug 2011
Posts: 43,971
Likes: 1,577
From: Prescott, Az
Year: 1990
Model: Cherokee (XJ)
Engine: 4.0
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