4.0 throttle body upgrade compatable??? - Jeep Wrangler Forum

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

Join Wrangler Forum Today

Thread Tools

Please support our sponsors and let them know you heard about them on WranglerForum.com
Old 03-15-2012, 11:31 AM   #1
Join Date: Feb 2011
Posts: 126
4.0 throttle body upgrade compatable???

I have a 1990 YJ with the enimic 2.5l. I've been reading about the 4.0 TB upgrade and what I can tell is that if you have the 4 bolt intake then you can upgrade, if you have the 3 bolt intake then you can't.

Here's the skinny, I just looked at mine and it looks like it has 4 bolts but they are not symetrical spacing. They don't look like the hole will line up on the 4.0 TB's that i've seen for sale.

o o 0 0

0 0 0 0

My TB pattern 4.0 TB pattern

Any ideas if I would be able to make the swap???


Enjoy the ride, LIFE!
Captainrichhill is offline   Quote
Old 03-15-2012, 01:00 PM   #2
Tyewilly's Avatar
Join Date: Dec 2010
Posts: 551
The 4.0 throttle body will fit '91+ 2.5s with mpi, unfortunately it won't fit '87 - '90 2.5s with tbi.

Tyewilly is offline   Quote
Old 03-15-2012, 03:01 PM   #3
Xpress's Avatar
Join Date: Jan 2011
Location: El Cajon
Posts: 2,585
Yes, unfortunately you have a TBI model. The 4.0 throttle body was made for MPFI intakes, not your single injector style.

Remove the intake pipe from the throttle body. If there is a big injector inside, the 4.0 swap won't work.

2.5L Genius of some sort.
Xpress is offline   Quote
Old 03-15-2012, 07:16 PM   #4
Join Date: Feb 2011
Posts: 126
Thanks : (
Enjoy the ride, LIFE!
Captainrichhill is offline   Quote
Old 03-17-2012, 09:09 PM   #5
Join Date: May 2010
Posts: 7
You could try this out: Leigh Performance Machine
'89 2.5L all stock for now.
cvdenson is offline   Quote

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
2.5 to 4.0 Throttle body swap. Help!! Toms94YJ YJ Tech Forum 42 09-27-2015 03:30 PM
Body Lift rspangler0306 JK General Discussion Forum 27 04-23-2014 09:20 PM
CT: Body armor 2dr jk Roof rack with basket AXman Classifieds Archive 15 04-10-2012 02:01 PM
NY: 91 YJ 4.0 5 Speed SOA 35's Moroney167 Classifieds Archive 6 04-04-2012 04:39 PM
Has anybody tried this throttle body Jsjk JK General Discussion Forum 5 03-15-2012 10:49 AM

Download our Mobile App

» Featured Product

All times are GMT -5. The time now is 08:11 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