94 YJ wont start - 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 07-17-2011, 10:24 PM   #1
Join Date: Jul 2011
Posts: 1
94 YJ wont start

jeep just kept turning over, changed fuel filter, fuel pump,wires,plugs,dist., rotor. Jeep would start if i prime throttle body with quickstart. Would run for hours like new, turn off and try to start again like 20min later, no start. Took off throttle body and cleaned, after reinsall throtle body, used throttle body cleaner. Ran good but after about 15-20min would not start again, just keeps turning over. Only can start with quickstar. WTF????? anyone else ideas?

jbomb48 is offline   Quote
Old 07-18-2011, 05:42 AM   #2
Irongrave's Avatar
Join Date: Apr 2011
Location: Erie, PA
Posts: 2,800
Send a message via AIM to Irongrave
When your cranking it do you hear the fuel pump kick on to prime the rails.

I would check both the ASD (auto shut down relay) and the fuel pump relay and make sure both are good.

If they are good and still have the problem you need to pick up a used PCM from a 92+ 4.0 rig and that should fix your problem.

Irongrave is offline   Quote
Old 07-18-2011, 05:45 PM   #3
Join Date: Mar 2010
Location: Buffalo Grove, IL.
Posts: 248
Without a crankshaft position sensor the engine will not run. The CPS controls the firing of the injectors. Before spending $500 on a ECU check the CPS.
Snuffy115 is offline   Quote
Old 07-18-2011, 06:00 PM   #4
Nsoares3's Avatar
Join Date: Oct 2010
Location: New Bedford, MA
Posts: 85
Originally Posted by Snuffy115
Without a crankshaft position sensor the engine will not run. The CPS controls the firing of the injectors. Before spending $500 on a ECU check the CPS.
I spent $100. Took 5 mins removing/replacing PCM... Best investment I've made so far.
Nsoares3 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
1995 Jeep Wrangler YJ will not start after these Symptoms packermanwi YJ Tech Forum 11 09-28-2012 08:52 AM
Will not start ssgggtom YJ Tech Forum 2 05-10-2010 11:10 AM
Jeep wont start.. Kodysteeler43 TJ Tech Forum 0 05-06-2010 12:30 PM
01 won't start Jeepguy TJ Tech Forum 1 03-01-2010 12:15 PM
Turns But Won't Start... Not an easy answer Cryptos TJ Tech Forum 18 06-25-2009 07:12 AM

Download our Mobile App

» Featured Product

All times are GMT -5. The time now is 01:00 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