MJ Comanche Tech. Stock & Modified. MJ (86-92)
All discussion regarding the Jeep Comanche, the pickup truck related to the Cherokee platform.

Starts but dies, my truck is making me criminally insane

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Old Aug 8, 2015 | 05:33 PM
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co-MAN-che's Avatar
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From: Brownsville, Ohio
Year: 1991
Model: Comanche
Engine: 4.0L HO
Default Starts but dies, my truck is making me criminally insane

I have checked my fuel pressure. I have checked my pump and sending unit. I have checked the circuit to the pump and sending unit. I have replaced every relay and fuse associated with the fuel and ignition system. I have replaced every sensor and switch associated with the fuel and ignition system.Is there something I'm missing that could lead the truck to start, idle quite high for 3-4 seconds, then begin to slow down so much in idle speed that it starts shuddering until it utterly dies? I'm starting to think this truck cannot be fixed.
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Old Aug 9, 2015 | 01:26 PM
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Metmknice's Avatar
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From: Hell, CA
Year: 1989
Model: Cherokee
Engine: 4.0L I6
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Ballast resistor, driver side inner fender, near air box. Has 2 wires connected to it. It is common for these to fail. To confirm, pull the 2 wires and jump them together and attempt to start/run vehicle. If this works, more permanently jumper the wires and voila!
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Old Aug 9, 2015 | 01:55 PM
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co-MAN-che's Avatar
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From: Brownsville, Ohio
Year: 1991
Model: Comanche
Engine: 4.0L HO
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I have no current going to the ballast resistor even when key is in start or run. I think that's where I need to start looking for my problem
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Old Mar 20, 2025 | 11:18 AM
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That Jeep Guy XJMJ's Avatar
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From: Michigan
Year: 1987 MJ, 1973 J2000, 1986 XJ, 08 JK
Model: Comanche (MJ)
Engine: 4.0L H.O
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Originally Posted by FletcherHubbards
It is common for these to fail. To confirm, pull the 2 wires and jump them together and attempt to start/run vehicle. If this works, more permanently jumper the wires and voila!
Fletch why are you digging up all the old posts under MJ tech? What's your angle man
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