engine wirring - Off-Road Forums & Discussion Groups
Jeep-Short Wheelbase All discussion of short wheelbase Jeeps: CJ, TJ, YJ and JK

LinkBack Thread Tools Display Modes
post #1 of (permalink) Old 03-29-2001, 01:10 PM
Posts: n/a
engine wirring

Can any one tell me what year ('87-'95) the computer for the engine was either in the passanger compartment or on the firewall (Driver's side in the engine compartment). I would like to get a "new" harness for my wrangler. 4.0L fuel inj. thanks to all your replies. but maybe i should clearit up. I have a '87 YJ and want to put either a '94-'95 wireing harness in it. My current ECU is behind the glovebox and I want to retain it there (so there is no big hole in my fire wall).

Sponsored Links
post #2 of (permalink) Old 03-29-2001, 02:55 PM
Posts: n/a
Re: engine wirring

I believe that all that were equipped with the 4.2L I-6 had the ECU in the dash or on the firewall. I have not worked on much other than CJ's. You might browse through a Haynes or Chiltons manual. You might find one at the auto parts store that someone else has torn the plastic off of and you can get a free quick peek.


[img]/wwwthreads_images/icons/crazy.gif[/img] A conclusion is simply the place where you got tired of thinking. [img]/wwwthreads_images/icons/tongue.gif[/img]
[email protected]
post #3 of (permalink) Old 03-29-2001, 06:20 PM
Join Date: Mar 2001
Location: Tecolutla, Veracruz Mexico
Posts: 226
Thanks: 0
Thanked 0 Times in 0 Posts
Re: engine wirring

When I ripped mine out of my 87 Wrangler, it was under the dash on the pasanger side.

Sponsored Links
post #4 of (permalink) Old 03-29-2001, 08:00 PM
Can't Get Enough
Join Date: Sep 1999
Location: Cotopaxi, Colorado
Posts: 1,036
Thanks: 0
Thanked 0 Times in 0 Posts
Re: engine wirring

I think that '91 up 4.0l YJ's had them mounted on the firewall next to the washer bottle on the drivers side.

dorfs is offline  
post #5 of (permalink) Old 03-30-2001, 12:10 AM
Posts: n/a
Re: engine wirring

My understanding is that you are all sort of right...
The engines computer (ECU) is mounted under the dash inside the Jeep behind the clovw box.
The Ignition control module (ICM) is mounted under the washer bottle on the drivers side engine compartment.
The ICM takes cues from the ECU to control the spark.
That's for the 4.2. I can only assume it's similar for the 4.0. Either way the actual computer ECU should be under the dash.

'88 Sahara, 4.2, auto.
post #6 of (permalink) Old 03-30-2001, 01:17 AM
Posts: n/a
Re: engine wirring

I beleive that up until 90 the computer was behind the glovebox and 91 and up are mounted in the engine conpartment.

89 YJ 4.2, AX15, Procomp 4" Lift, MSD6a, and just gerttin started......
Sponsored Links

Quick Reply

Register Now

In order to be able to post messages on the Off-Road Forums & Discussion Groups forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
Please enter a password for your user account. Note that passwords are case-sensitive.


Confirm Password:
Email Address
Please enter a valid email address for yourself.

Email Address:


Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page
Display Modes
Linear Mode Linear Mode

Posting Rules  
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On

For the best viewing experience please update your browser to Google Chrome