94 wrangler Intermittent starting problem - 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 03-03-2011, 04:49 PM   #1
Join Date: Mar 2011
Posts: 3
94 wrangler Intermittent starting problem

Guys -this is a good one
I have a 94 wrangler with the straight six. Sometimes it starts, sometimes it doesnt. no rhyme or reason why. When it does start, it starts easily and right away on the first crank. When it doesn't start the engine will just crank and crank. One time when It did not start, I tested and found no spark on the main coil wire. I changed the coil and plugs and she fired right up. I also put in some injector cleaner in the gas. However, a few days later it did not start again and this time the battery went dead.

Pissed off and no time to fix it, I had the jeep towed to a jeep dealer. They replaced the battery but the intermittent starting problem still exists. They have had the jeep for 3 weeks trying to "catch" the problem. Today I called and they said it did not start. They think it is in the starter relay circuit and are looking to get a wiring diagram.

Any thoughts on what the problem could be?

RI94Wrangler is offline   Quote Quick Reply
Old 03-03-2011, 05:25 PM   #2
Undead-89's Avatar
Join Date: Feb 2011
Location: Loveland, CO
Posts: 760
Is there anything different about the temperature, or humidity on the days it doesn't work? Were all the connections checked to make sure none were loose? Is it possible the Auto Shutdown relay is flakey and needs to be replaced?

Undead-89 is offline   Quote Quick Reply
Old 03-03-2011, 05:57 PM   #3
Join Date: Mar 2011
Posts: 3
the temp has been between 10 and 30F. the problem seems to happen when its colder but it has started at 10 degrees. The wires never been checked (which ones).

What is a Auto shutdown relay?
RI94Wrangler is offline   Quote Quick Reply
Old 03-03-2011, 10:22 PM   #4
Undead-89's Avatar
Join Date: Feb 2011
Location: Loveland, CO
Posts: 760
A relay in the engine compartment fuse box which is supposed to get a signal from the PCM to tell it to allow the engine to get a spark. If the relay is sticking it might not let the car start, though you can turn it over.

If PCM was causing it you should get trouble codes in the diagnostic connector which the Jeep place should have attempted to read.
Undead-89 is offline   Quote Quick Reply
Old 09-10-2013, 11:59 PM   #5
Join Date: Sep 2013
Posts: 1
Hello, im new to the site and recently purchased a 94 YJ straight six, manual trans and am having the same EXACT issue. Recently replaced the battery. 800CCA, 3 days t later the intermittent starting problem returned. Ive been very conscious of temp. conditions, weather etc. And there is literally no pattern to the starting. Wondering if anything was solved or figured out from the posts above. Any help would be appreciated.
WhiteYJ6 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:
If you do not want to register, fill this field only and the name will be used as user name for your post.
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
jeep wrangler 2002 hard starting problems jeeperson TJ General Discussion Forum 6 03-11-2012 09:25 PM
Grand Cherokee, starting problem after getting fuel injector serviced SusanH YJ General Discussion Forum 5 02-26-2011 01:04 PM
Starting Problem qman2 YJ Tech Forum 8 06-12-2010 05:35 PM
94 Wrangler Starting problem Flyby95 YJ Tech Forum 2 06-07-2010 09:30 PM
03 TJ jeep wrangler problem PLEASE HELP! macateco TJ Tech Forum 9 01-08-2010 01:35 PM

» Network Links
»Jeep Parts
» Featured Product

All times are GMT -5. The time now is 05:00 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