replacing ignition control module and coil - Page 2 - JeepForum.com

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post #16 of 27 Old 03-04-2013, 01:20 PM
86cj74.2L
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Any can type coil with the ford terminals will work.

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post #17 of 27 Old 03-04-2013, 09:47 PM
bigbird24
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3.0 OHM or 1.5 OHM doesn't make a difference?
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post #18 of 27 Old 03-04-2013, 10:12 PM
BagusJeep
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The coil is a standard 12V BALLASTED coil. It normally runs at 7V and in Start it gets 12V for a few seconds.

Lots of vendors selling coils with all sorts of fantastic claims but it is a bog standard sub $20 piece of kit.

I have a Mallory Promaster coil ($96) that will take a lot of punishment but in reality any new coil will work better than that old one.

And that thing on the side is to reduce radio interference, not vital but useful.
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schematic ignition layout.png  

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1981 CJ7 258ci - Bagusjeep
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1981 J20 258ci - Gladys
1951 Willys CJ3A/MB/M38 - Little Willy
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post #19 of 27 Old 03-05-2013, 03:27 AM
John Strenk
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Quote:
Originally Posted by bigbird24 View Post
3.0 OHM or 1.5 OHM doesn't make a difference?

Kind of, the coil winding in the higher performance coils usually have a lower resistance so using a 3 ohm ballast resister might drop the voltage too low on the coil. the 1.5 ohm will raise the voltage but allow more current to run through it and could overheat the ICM.


The resistance wire in a stock jeep is 1.35 ohms.
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post #20 of 27 Old 03-05-2013, 03:03 PM
bigbird24
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The new wiring harness and weber carburetor have made the icm useless so it has been removed. which still leaves me with the question of which to use, sorry but I'm new to this
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post #21 of 27 Old 03-05-2013, 03:43 PM
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If your just looking to replace the coil with a OEM coil just go to the parts store and get a new coil for a 80's CJ with a 258.

Is yours bad or you do not like the rust?
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post #22 of 27 Old 05-15-2015, 04:39 PM
Marlen
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I have some trouble identifiying and matching the colors present in my CJ7 1982 258 when changing the ICM. Original cables differ in color with the ones in the new part and also the plugs to connect it differ.

I have some pics but really dont know how to upload them

I would appreciate some help on this
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post #23 of 27 Old 05-15-2015, 04:47 PM
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Her some photos that follow the previous post
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post #24 of 27 Old 05-15-2015, 04:52 PM
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Here, finally the pics
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20150514_133828.jpg   20150514_133833.jpg   20150514_133838.jpg  
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post #25 of 27 Old 05-16-2015, 04:53 AM
Mike Romain
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Quote:
Originally Posted by Marlen View Post
I have some trouble identifiying and matching the colors present in my CJ7 1982 258 when changing the ICM. Original cables differ in color with the ones in the new part and also the plugs to connect it differ.

I have some pics but really dont know how to upload them

I would appreciate some help on this
That is not an ICM, that is an idle speed controller for the stepper motor on the back of the carb that adjusts the mix according to inputs from things like the O2 sensor.
Your ICM is way down on the drivers side fender under the washer bottle.

Mike
86/00 CJ7 Laredo, 33x9.5 BFG AT's, 'glass nose to tail in '00, 'New' frame,wires and plumbing in '09. Carter BBD Carbed 4.0 HO in '10.
89 YJ Renegade. BBD Carbed 4.0 HO. Locked front and rear with 33x9.5 BFG AT's
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post #26 of 27 Old 05-16-2015, 04:56 AM
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Quote:
Originally Posted by Marlen
Here, finally the pics
There is a difference between "idle" control box and the "ignition" control. The idle control box as I understand is a pre ECM type of computer that largely has to do with emissions control. Someone please correct me if I'm wrong. Jeeps 82 and older had the idle speed control box where as 83 and later had the ECM. The idle control mounts to the passenger gender where the ignition control mounts to the driver fender. If your idle control box is somehow broken you will probably have a hard time finding a replacement. There are some threads that deal with bypassing the idle control box all together. In my 82 I have removed mine and all the associated wiring but still have a lot of work to do before I wire everything back and try and start. Hope this helps.
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post #27 of 27 Old 05-16-2015, 05:42 AM
Mike Romain
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Originally Posted by ColdSteel85 View Post

There is a difference between "idle" control box and the "ignition" control. The idle control box as I understand is a pre ECM type of computer that largely has to do with emissions control. Someone please correct me if I'm wrong. Jeeps 82 and older had the idle speed control box where as 83 and later had the ECM. The idle control mounts to the passenger gender where the ignition control mounts to the driver fender. If your idle control box is somehow broken you will probably have a hard time finding a replacement. There are some threads that deal with bypassing the idle control box all together. In my 82 I have removed mine and all the associated wiring but still have a lot of work to do before I wire everything back and try and start. Hope this helps.
If your idle control box is cooked, you can just set the stepper motor pins in the center of their travel with 1/8" of shaft showing from the back wall before the taper. Your carb will then act like a pre-stepper BBD and be good to go. That setting is important for gas mileage as it controls the mix.

Mike
86/00 CJ7 Laredo, 33x9.5 BFG AT's, 'glass nose to tail in '00, 'New' frame,wires and plumbing in '09. Carter BBD Carbed 4.0 HO in '10.
89 YJ Renegade. BBD Carbed 4.0 HO. Locked front and rear with 33x9.5 BFG AT's
Some Canadian Bush Jeep Runs and Build Photos: http://mikeromainjeeptrips.shutterfly.com (10 new albums added Sept 16/10)
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