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Unread 06-02-2010, 07:55 PM   #1
nickaldrich
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1994 YJ Wrangler 
 
Join Date: Aug 2006
Location: adrian
Posts: 36
1994 yj heart transplant

I have a 94 yj 2.5l 5 speed, i work at a larger junk yard and have plenty of 4.0L out of cherokees and grand cherokees.. i have my engine,trans,tcase,driveshafts,radiator out of a salvaged 94 wrangler but i got there to late and they sold the harness and ecm... my question is does anyone know if i can use any other ecm and wiring harness????

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Unread 06-03-2010, 09:03 AM   #2
nickaldrich
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Nobody?? please help
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Unread 06-03-2010, 09:32 AM   #3
Que89YJ
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1989 YJ Wrangler 
 
Join Date: Apr 2008
Location: Detroit, Michigan
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Yes you can. The XJ OBD1 and the YJ are the same. Make sure that you are getting it for the right engine. 91 and later under the hood are the same but you will run into complications with the IP wiring between the years. Especially the bulkhead, ignition switch, and cluster. What year YJ are you starting with? Your in Adrian Michigan?
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Unread 06-03-2010, 10:03 AM   #4
rusteehawk71
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1994 YJ Wrangler 
 
Join Date: Feb 2007
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You can use the ECM that is already in your Jeep. All you need is the engine harness from the donor vehicle, it will plug right into your ECM and your good to go.
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Unread 06-03-2010, 10:04 AM   #5
nickaldrich
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1994 yj is whats its going into... i did live there.. now im in livonia and work in ypsilanti
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Unread 06-03-2010, 10:14 AM   #6
nickaldrich
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the 2.5l ecm will run the 4.0l???
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Unread 06-03-2010, 10:16 AM   #7
Que89YJ
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1989 YJ Wrangler 
 
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No, that was what I was saying. It has to be motor to motor for the ECM. The drivers are different
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Unread 06-03-2010, 10:19 AM   #8
Que89YJ
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1989 YJ Wrangler 
 
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If you need any help let me know. I am downriver and work in Auburn Hills. There have been a bunch of part outs you can get harnesses and ECM from in Craigslist and on the Great Lakes 4x4 forum.
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Unread 06-03-2010, 10:20 AM   #9
nickaldrich
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Engine is out of a 1994 xj.. so its just plug and play?? my jeep is a 94 2.5l stick and the xj is a 4.0l auto.. i am taking the wiring harness from the xj and the ecm from it too... will it just plug in at the bulk head and will my gauges work??? thanks again
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Unread 06-03-2010, 10:26 AM   #10
Que89YJ
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1989 YJ Wrangler 
 
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No, there are some wiring differences. Close but no cigar. Your wiring harness will work. You just need to swap the ECU and add 2 injector wires. The auto trans had the nuetral saftey switch so you jumper those pins on the ECU and you should be good to go. No need to swap the wiring harness at all.
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Unread 06-03-2010, 10:51 AM   #11
Que89YJ
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1989 YJ Wrangler 
 
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If you need help with the injector wires and jumping the nuetral saftey switch I can give you a hand. Maybe we can do a little documentation. I know this has come up before. I havent done a writeup here yet. It seems like it would be a good one to do.
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Unread 06-03-2010, 10:53 AM   #12
nickaldrich
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Thanks.. ill have to take you up on that
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Unread 06-03-2010, 11:06 AM   #13
Que89YJ
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1989 YJ Wrangler 
 
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Clearout some space in your box and I can send you my info. or PM me yours.

Last edited by Que89YJ; 06-03-2010 at 11:25 AM..
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Unread 06-03-2010, 11:29 AM   #14
nickaldrich
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lol.. its done
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