4.0 in 89 yj won't stay running - Jeep Wrangler Forum
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 02-25-2012, 07:12 AM   #1
Join Date: Dec 2010
Posts: 16
4.0 in 89 yj won't stay running

I put a 4.0 in my 89 yj. It will start then it dies like it is running out of fuel. Have 55 lbs fuel pressure. Do I need to have my breather on to make it run?

gregb is offline   Quote Quick Reply
Old 02-25-2012, 07:48 AM   #2
jr78racer's Avatar
Join Date: Feb 2012
Location: Rockford, IL
Posts: 136
ill probably get boooed and incorrect buzzered but im thinkin check ignition system. bad coil, bad crank position sensor. never had one do that so idk

some may call it overbuilt. my right foot calls it future scrap.
jr78racer is offline   Quote Quick Reply
Old 02-25-2012, 02:47 PM   #3
Join Date: Dec 2010
Posts: 16
4.0 won't stay running

This motor was running when pulled out. Will check ing system coil and crank sensor. I put noed on injector and it flashed for 4 sec and shut down, like electric just shut off.
gregb is offline   Quote Quick Reply

Quick Reply

Register Now

In order to be able to post messages on the Jeep Wrangler Forum 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:


Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.

Thread Tools

Posting Rules
You may post new threads
You may 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
The last person to post in this thread wins.... 02Prove Off-Topic 252762 Today 02:25 PM
What I did to my YJ today 1990_YJ YJ General Discussion Forum 11371 Yesterday 09:12 PM
93 2.5 to 4.0 swap.here we go! kdub YJ Tech Forum 150 01-13-2013 06:28 PM
Down line in a wind storm 56cj5 TJ General Discussion Forum 14 02-27-2012 03:58 PM
Advice in selling a car Cosmic Charlie Off-Topic 8 02-25-2012 07:53 AM

» Featured Product

All times are GMT -5. The time now is 02:52 PM.

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