4.0 swap wiring - Jeep Wrangler Forum

Go Back   Jeep Wrangler Forum > YJ Jeep Wrangler Forum > YJ Tech Forum

Join Wrangler Forum Today


Reply
 
Thread Tools

Please support our sponsors and let them know you heard about them on WranglerForum.com
Old 02-10-2012, 03:58 PM   #1
Jeeper
 
kdub's Avatar
 
Join Date: Sep 2011
Location: alabama
Posts: 521
4.0 swap wiring

ok i got mixed reviews on this.got a 93 2.5 ax5 swaping it with 95 4.0 ax15.i got the whole harness for the 4.0 with computer.will everything plug in and run.or will i have to use my 2.5 harness and splice in 2 injector wires.if i have to splice injector wires how do you do that.the 4.0 is out of a 95 yj.it looks like to me the plug that goes into the inside fuse box on the firewall is different.would it be easier to get a inside fuse box for the 4.0

kdub is offline   Quote
Old 02-10-2012, 05:21 PM   #2
Jeeper
 
kboles89's Avatar
 
Join Date: Jan 2011
Location: elon, nc
Posts: 451
It's alot easier to add the two wires. You can use the 4.0 harness but to me it made it harder. It's just what you prefer.

kboles89 is offline   Quote
Old 02-10-2012, 05:37 PM   #3
Jeeper
 
kdub's Avatar
 
Join Date: Sep 2011
Location: alabama
Posts: 521
Quote:
Originally Posted by kboles89 View Post
It's alot easier to add the two wires. You can use the 4.0 harness but to me it made it harder. It's just what you prefer.
how do you splice the wires.is there a link to how to do it.what made it hard to use the 4.0 harness
kdub is offline   Quote
Old 02-10-2012, 05:55 PM   #4
Jeeper
 
kboles89's Avatar
 
Join Date: Jan 2011
Location: elon, nc
Posts: 451
The 4.0 harness requires you to remove all the 2.5 stuff. To run the new wires you pull the 5 & 6 injector connector with wires from the pcm connector bulkhead on the 4.0 harness. The pcm is only a ground so you get your power from the main line. I think the main power line is green and black and all the other injector wires attach to it. So put your new connectors where you want them, push the wiring into the heat wrap all the way to the pcm. I can get you the diagram of the bulkhead to see what numbers you push your pins into. Push your pins into the corresponding holes, then tap your power wires into the main injector feed wires. Install your new pcm and connect the bulkhead and you are good to go. I'll try to find that pinout diagram so you know where to put the new wires. If you don't understand (or if I'm confusing you) I can take some pictures of mine.
kboles89 is offline   Quote
Old 02-10-2012, 06:05 PM   #5
Jeeper
 
kdub's Avatar
 
Join Date: Sep 2011
Location: alabama
Posts: 521
Quote:
Originally Posted by kboles89 View Post
The 4.0 harness requires you to remove all the 2.5 stuff. To run the new wires you pull the 5 & 6 injector connector with wires from the pcm connector bulkhead on the 4.0 harness. The pcm is only a ground so you get your power from the main line. I think the main power line is green and black and all the other injector wires attach to it. So put your new connectors where you want them, push the wiring into the heat wrap all the way to the pcm. I can get you the diagram of the bulkhead to see what numbers you push your pins into. Push your pins into the corresponding holes, then tap your power wires into the main injector feed wires. Install your new pcm and connect the bulkhead and you are good to go. I'll try to find that pinout diagram so you know where to put the new wires. If you don't understand (or if I'm confusing you) I can take some pictures of mine.
im kinda confused.if you could send me some pics.i think i understand but not sure
kdub is offline   Quote
Old 02-10-2012, 08:44 PM   #6
Jeeper
 
kdub's Avatar
 
Join Date: Sep 2011
Location: alabama
Posts: 521
will the 4.0 wiring harness plug into the dash harness on the firewall above the computer.i just looked on ebay for a dash harness and none of them specify what engine.
kdub is offline   Quote
Old 02-10-2012, 08:47 PM   #7
Jeeper
 
kboles89's Avatar
 
Join Date: Jan 2011
Location: elon, nc
Posts: 451
Idk I didn't swap mine. I think it would, the interior wiring is all the same. I'll get you pics and that diagram tomorrow if I don't get forget.
kboles89 is offline   Quote
Old 02-10-2012, 08:58 PM   #8
Jeeper
 
kdub's Avatar
 
Join Date: Sep 2011
Location: alabama
Posts: 521
if it does imm just going to use the 4.0 harness.but do send me the pics if u think about it
kdub is offline   Quote
Old 06-26-2013, 12:53 AM   #9
Jeeper
 
maverick1979's Avatar
 
Join Date: Jun 2013
Posts: 105
2.5 to 4.0

did the same thing to my 93 and was wounding if you could help me out to. its all the same thing going on but not for sure witch harness to use. with the 4.0 i have to jump the relay to get it to start temp gauge don't work and it says it in 4x4. with the 2.5 it turn over but wont run at all everything seems to work with the 2.5 except the run parts of it and i bet it would only run on 4 cylinder too

maverick1979 is offline   Quote
Reply

Thread Tools

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 Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
YJ 32RH transmission swap Sahara4x4 YJ Tech Forum 1 12-27-2010 09:45 AM
Engine Swap knnphillips TJ Tech Forum 5 12-03-2010 08:40 AM
To all of you 8.8 swap guys... Cons_Table TJ General Discussion Forum 11 11-18-2010 01:29 AM
np435 swap GrnTJ Builders Corner 63 02-14-2009 04:44 PM
Swap Meet Flash Off-Topic 0 05-02-2005 01:50 PM



Download our Mobile App

» Featured Product

All times are GMT -5. The time now is 10:22 PM.


User Alert System provided by Advanced User Tagging v3.1.0 (Pro) - vBulletin Mods & Addons Copyright © 2015 DragonByte Technologies Ltd.

Jeep®, Wrangler, Liberty, Wagoneer, Cherokee, and Grand Cherokee are copyrighted and trademarked to Chrysler Motors LLC.
Wranglerforum.com is not in any way associated with the Chrysler Motors LLC