90 comanche starting problem - JeepForum.com
 
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post #1 of 3 Old 04-06-2008, 02:59 PM Thread Starter
tatered1
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Join Date: Apr 2008
Location: washington
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90 comanche starting problem

Ok this is a weird one the engine will only stay running if the key is held in the start position if you let go of the key it dies.

the ignition switch has been replaced and the ignition module tested and checked ok

anyone had this problem before?

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post #2 of 3 Old 04-06-2008, 05:08 PM
Pete M
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1988 MJ Comanche 
 
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Location: S/E Michigan
Posts: 1,837
Have you tried bypassing the ceramic resistor on the fender? When cranking the computer puts direct power to the fuel pump, but after that it sends power through the resistor (whose purpose is to cut the voltage a bit and quiet the pump down). Try connecting the wires directly together and see what happens. (it won't harm anything, 87s didn't even have them)
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--Pete

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-88 MJ; 4.0L, ex-2wd, TJ ax15/231, 78 Ford D44 w/spool, 9" w/posi, 33" trXus MTs, custom roll-bar/bumpers/etc.
Also an 86 MJ Metric ton and 2 '90 MJs
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Last edited by Pete M; 04-06-2008 at 05:20 PM.
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post #3 of 3 Old 04-09-2008, 09:42 AM
maddzz
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1989 MJ Comanche 
 
Join Date: Nov 2007
Location: Rhode Island
Posts: 277
I had the same exact problem. Its not the ballist resistor. It is a wire behind the battery next to the fusible link. Im not sure which wire because I finally brought it to a shop that specializes in aut electrical.
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