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Unread 06-03-2013, 09:24 PM   #16
Old4X
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1990 CJ7 
 
Join Date: Nov 2008
Location: Ga
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Quote:
Originally Posted by Que89YJ View Post
ignition coil module
Ignition Control Module.

The coil is a different part

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418 miles on 19 gallons of gas. Can't beat the BBD !
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Unread 06-03-2013, 09:25 PM   #17
Que89YJ
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1989 YJ Wrangler 
 
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Location: Detroit, Michigan
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I think you are thinking of the pickup/cam sensor in the distributor.
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Unread 06-03-2013, 09:38 PM   #18
Old4X
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No, that is the pickup that sends the signal to the Ignition Control Module that breaks the ground on the Coil primary windings that causes a collapse of the magnetic field that creates the spark in the secondary windings in the coil that produces the spark that goes out the top of the coil to the center connector on the distributor cap that jumps to the adjacent conductor at that moment of the rotor to the conductor in the cap that leads via a sparkplug wire to a sparkplug.

Look up Motorcraft Duraspark Ignition system. That is what sparks a 90 model Jeep Wrangler 4.2 ignition. And the ICM on these systems is a 5" X 5" aluminum box that is mounted under the washer bottle.
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Unread 06-03-2013, 09:39 PM   #19
Old4X
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And there is NO CAM SENSOR on 4.2 engines!
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Unread 06-04-2013, 05:34 AM   #20
Que89YJ
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1989 YJ Wrangler 
 
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pickup/cam is the same thing as far as purpose that is why I put both. damn too many acronyms! listen to old4x. he is good.
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Unread 06-04-2013, 02:35 PM   #21
diaz425
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Quote:
Originally Posted by Que89YJ View Post
icm is the coil with the plug wire running to the distributor.
this is what i replace "ignition coil" http://www.autozone.com/autozone/par...Coil/_/N-9n80r

and this is what i ask where it is in the jeep. ICM "ignition control module" http://www.autozone.com/autozone/par...dule/_/N-9n80t

i just woke up after a long 12 driving all night. it sucks working that long and getting home and sleep. wake up and just thinking about what could be wrong with the jeep. i'm just gonna go and take the kids out to eat. by the time i get back it's time to work. I need a vacation
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Unread 06-04-2013, 03:57 PM   #22
Que89YJ
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1989 YJ Wrangler 
 
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don't listen to me on this. old4x had it right. I didn't read it right. I was serious, he knows his stuff.
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Unread 06-04-2013, 06:55 PM   #23
diaz425
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I called autozone to order the icm. They ask i can bring in the old one to have it tested. I took it in today. They tested it and it fail. They going to test the new one tomorrow and im taking the old one back to retest just in case they wired it wrong. But i am hoping that it is true about the old one failing and is causing the problem. Ill find out tomorrow and hopefully have the jeep running
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Unread 06-05-2013, 09:14 AM   #24
Que89YJ
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LOL Old4x knows his stuff. Post back if the ICM does fix it.
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Unread 06-05-2013, 03:45 PM   #25
diaz425
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i went to pick up the icm. already installed, started her up. rpm lowered down after warm and she hasn't stalled. turn her off waited 5 mins started her up still running great. tried it a couple more times and still hasn't died . i still have not test driven her. got the kids home and dont want to take chances at this time til tomorrow when my wife is at home taking care of the kids. but as of now she is working without stalling in the driveway.
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Unread 06-05-2013, 06:41 PM   #26
diaz425
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1990 YJ Wrangler 
 
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I took my chances took my jeep to work. And all went well. Didnt stall in the middle of the road. So my problem is fixed with the new icm.
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