replacing ignition control module and coil - Page 2 - JeepForum.com
Search  
Sign Up   Today's Posts
User: Pass: Remember?
Advertise Here
Jeep Home Jeep Forum Jeep Classifieds Jeep Registry JeepSpace Jeep Reviews Jeep Gallery Jeep Clubs Jeep Groups Jeep Videos Jeep Events Jeep Articles
Go Back JeepForum.com > Models > Jeep CJ Forum > replacing ignition control module and coil

Save 17.76% for the 4th of july with ruffstuff specialtiesIntroducing MONSTALINER™ UV Permanent DIY Roll On Bed LineSave on AEM Intakes from XT!

Reply
Unread 03-04-2013, 01:20 PM   #16
86cj74.2L
Registered User
2004 WJ 
 
Join Date: Jul 2006
Location: Stouchsburg, PA
Posts: 7,847
Any can type coil with the ford terminals will work.

86cj74.2L is offline   Reply With Quote Quick reply to this message
Unread 03-04-2013, 09:47 PM   #17
bigbird24
Registered User
1986 CJ7 
 
Join Date: Mar 2013
Location: huntington, NY
Posts: 3
3.0 OHM or 1.5 OHM doesn't make a difference?
bigbird24 is offline   Reply With Quote Quick reply to this message
Unread 03-04-2013, 10:12 PM   #18
BagusJeep
Web Wheeler
 
BagusJeep's Avatar
1981 CJ7 
 
Join Date: Jul 2009
Location: Bali, Indonesia
Posts: 4,944
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.
schematic-ignition-layout.png  
__________________
BagusJeep lives in Bali.

1981 CJ7 258ci - Bagusjeep
1984 CJ7 258ci - Puthijeep
1981 J20 258ci - Gladys
1947 Willys CJ2A/3A/MB/M38 - Little Willy
1995 Cherokee 4.0 - CHEROKEE
BagusJeep is offline   Reply With Quote Quick reply to this message
Unread 03-05-2013, 03:27 AM   #19
John Strenk
Moderator
 
John Strenk's Avatar
1976 CJ5 
 
Join Date: Feb 2005
Location: Shalersville Ohio
Posts: 13,909
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.
John Strenk is offline   Reply With Quote Quick reply to this message
Unread 03-05-2013, 03:03 PM   #20
bigbird24
Registered User
1986 CJ7 
 
Join Date: Mar 2013
Location: huntington, NY
Posts: 3
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
bigbird24 is offline   Reply With Quote Quick reply to this message
Unread 03-05-2013, 03:43 PM   #21
86cj74.2L
Registered User
2004 WJ 
 
Join Date: Jul 2006
Location: Stouchsburg, PA
Posts: 7,847
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?
86cj74.2L is offline   Reply With Quote Quick reply to this message
Unread 05-15-2015, 04:39 PM   #22
Marlen
Registered User
 
Join Date: May 2015
Posts: 3
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
Marlen is offline   Reply With Quote Quick reply to this message
Unread 05-15-2015, 04:47 PM   #23
Marlen
Registered User
 
Join Date: May 2015
Posts: 3
Her some photos that follow the previous post
Marlen is offline   Reply With Quote Quick reply to this message
Unread 05-15-2015, 04:52 PM   #24
Marlen
Registered User
 
Join Date: May 2015
Posts: 3
Here, finally the pics
20150514_133828.jpg   20150514_133833.jpg   20150514_133838.jpg  
Marlen is offline   Reply With Quote Quick reply to this message
Unread 05-16-2015, 04:53 AM   #25
Mike Romain
Registered User
1986 CJ7 
 
Join Date: Nov 2007
Location: Off the Grid in Chester Grant, Nova Scotia, Canada
Posts: 16,157
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
Some Canadian Bush Jeep Runs and Build Photos: http://mikeromainjeeptrips.shutterfly.com (10 new albums added Sept 16/10)
Mike Romain is offline   Reply With Quote Quick reply to this message
Unread 05-16-2015, 04:56 AM   #26
ColdSteel85
Registered User
1982 CJ7 
 
Join Date: Jan 2013
Location: Richlands, NC
Posts: 114
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.
ColdSteel85 is offline   Reply With Quote Quick reply to this message
Unread 05-16-2015, 05:42 AM   #27
Mike Romain
Registered User
1986 CJ7 
 
Join Date: Nov 2007
Location: Off the Grid in Chester Grant, Nova Scotia, Canada
Posts: 16,157
Quote:
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)
Mike Romain is offline   Reply With Quote Quick reply to this message
Reply

Tags
ignition coil , ignition module

Quick Reply
Message:
Options

Register Now

In order to be able to post messages on the JeepForum.com forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.
User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.
Password:
Confirm Password:
Email Address
Please enter a valid e-mail address for yourself.
Note: All free e-mails have been banned due to mis-use. (Yahoo, Gmail, Hotmail, etc.)
Don't have a non-free e-mail address? Click here for a solution: Manual Account Creation
Email Address:

Log-in

Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.


Thread Tools


Suggested Threads





Jeep, Wrangler, Cherokee, Grand Cherokee, and other models are copyrighted and trademarked to Jeep/Chrysler Corporation. JeepForum.com is not in any way associated with Jeep or the Chrysler Corp.