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**DONOTDELETE** 03-29-2001 01:10 PM

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).

**DONOTDELETE** 03-29-2001 02:55 PM

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.


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JEEPININMEXICO 03-29-2001 06:20 PM

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

dorfs 03-29-2001 08:00 PM

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.

**DONOTDELETE** 03-30-2001 12:10 AM

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.

**DONOTDELETE** 03-30-2001 01:17 AM

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......

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