1990 comanche no spark
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Joined: Nov 2014
Posts: 37
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From: Kalispell, MT
Year: 1990
Model: Cherokee (XJ)
Engine: 4.0L
These are the three wires the one on the right is bare and doesn't plug into the plug at all. Should I isolate them just up to the injectors or trace it all the way back?
Thread Starter
Junior Member
Joined: Nov 2014
Posts: 37
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From: Kalispell, MT
Year: 1990
Model: Cherokee (XJ)
Engine: 4.0L
i pulled the harness out from the firewall and completely exposed the wiring. i followed the knock sensor wiring all the way to the ecu plug and can not see anything wrong with them. i'm debating just going and pulling a wiring harness at the wrecking yard and just swapping it out.
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Joined: Aug 2011
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From: Prescott, Az
Year: 1990
Model: Cherokee (XJ)
Engine: 4.0
i pulled the harness out from the firewall and completely exposed the wiring. i followed the knock sensor wiring all the way to the ecu plug and can not see anything wrong with them. i'm debating just going and pulling a wiring harness at the wrecking yard and just swapping it out.
I don't know. Try leaving the knock sensor unplugged and see what happens.
Thread Starter
Junior Member
Joined: Nov 2014
Posts: 37
Likes: 0
From: Kalispell, MT
Year: 1990
Model: Cherokee (XJ)
Engine: 4.0L
Well after I got done re wrapping the harness i left the knock sensor unplugged and have been driving it for the last few days and it's been doing good. So I'm just going ti try and replace the sensor and hopefully that Solves it. Thanks for all your help cruiser
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