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Starts but dies, my truck is making me criminally insane

MJ Comanche Tech. Stock & Modified. MJ (86-92)
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Starts but dies, my truck is making me criminally insane

Old 08-08-2015, 05:33 PM
  #1  
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Join Date: Jun 2015
Location: Brownsville, Ohio
Posts: 47
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.
co-MAN-che is offline  
Old 08-09-2015, 01:26 PM
  #2  
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Join Date: Oct 2008
Location: Hell, CA
Posts: 2,127
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 08-09-2015, 01:55 PM
  #3  
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Join Date: Jun 2015
Location: Brownsville, Ohio
Posts: 47
Year: 1991
Model: Comanche
Engine: 4.0L HO
Default

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
co-MAN-che is offline  
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