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Old 09-06-2006, 05:59 PM   #1
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89 wrangler ignition problem

I have a 89 wrangler 4.2L, problem is engine sudenly stop working I noticed it don't have spark so I change coil, pikupcoil and ignition module also check wire continuity from coil to ignition module, ignition module to mcu, pickupcoil to mcu and everything is fine but still not spark, then I check signal from pickupcoil to mcu with power probe and there's signal reaching computer (dont know what else to do) maybe I have to replace mcu
Anyone have any idea what else I can do to test mcu to know if it is the problem?

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Old 09-06-2006, 08:17 PM   #2
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"Engine sudenly stopped working" is kinda vauge.......What happened? Cut out while driving? Wouldn't start after work one day?

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Old 09-07-2006, 04:13 AM   #3
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I was driving and it sudenly stop it was like no fuel then I wait a little and start it so I went to home and wrangler never start again
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Old 09-15-2006, 07:30 PM   #4
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computer bypass

Quote:
Originally Posted by Tornado
I have a 89 wrangler 4.2L, problem is engine sudenly stop working I noticed it don't have spark so I change coil, pikupcoil and ignition module also check wire continuity from coil to ignition module, ignition module to mcu, pickupcoil to mcu and everything is fine but still not spark, then I check signal from pickupcoil to mcu with power probe and there's signal reaching computer (dont know what else to do) maybe I have to replace mcu
Anyone have any idea what else I can do to test mcu to know if it is the problem?
you can try the computer bypass and if it starts after you do that you have found the problem. follow the orange and purple wire to the junction on the fire wall, at that same junction coming fron the igniton module you'll find a green wire, splice that to the orange, and run the purple to the purlple on the module. youi will have to cut that green wire temporarly. Good Luck.
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Old 09-15-2006, 09:25 PM   #5
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Did you try putting more gas in?

I know that comes off bad........but sensor could be bad.....it happened to my wifes car......it could happen to you.
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Old 09-16-2006, 10:35 PM   #6
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Thanks guys
Jeepster that is a great idea (computer bypass) will keep it in my files.
I fix it but I really don't know what was the problem, I just put on the old ignition module, new pick-up, new stater relay, new battery terminals, clean all connections with contact cleaner and turn ignition switch couple of times and engine come alive. I think it was a bad conections and bad ignition module (the newone).
Just to test purpose I try with the new ignition again but engine din't start, so I think the new ignition module is faulty so I will try again with a new original ignition module later.

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