Jeep turns over but doesn't start??help... - 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
Old 05-17-2011, 07:01 PM   #1
Join Date: Jul 2010
Posts: 26
Jeep turns over but doesn't start??help...

i have a 91 4.o jeep yj turns over but doesn't start? changed all plugs wires cap and rotor even the crank sensor.. could it be the fuel pump? i do hear the pump turn on though? is there any way to check it? im no mechanaic by any means though.. any suggestion guys??

thehorseman is offline   Quote Quick Reply
Old 05-17-2011, 07:15 PM   #2
POS YJ's Avatar
Join Date: Mar 2011
Location: Chico, CA
Posts: 281
There should be a Schrader valve on the fuel rail, the fuel lines going to the injectors. You can put a gauge on there to see what the pressure is or you can take the cap off of it and poke the valve core (like a tire valve) with a key or small screwdriver. BE CAREFUL!!! If your pump is working it will have about 40 psi in the line and can squirt on you. Please put on some protective eyeware before you do it that way. You should test this a couple of times by bleeding the pressure, then cycling the key to build fuel pressure again, and then bleeding the valve again. You can also use the small or medium sized screwdriver to check for spark by pulling a plug wire and putting the metal end in the boot, making contact with the metal. Then place the screwdriver close to, but not touching (+- 1/8"), a GROUNDED metal object. Have someone turn the key while you check for spark. Let us know what you find.

POS YJ is offline   Quote Quick Reply
Old 05-18-2011, 11:58 AM   #3
Join Date: Jul 2010
Posts: 26
thank pos yj im going out there now to try it.. ill keep you updated..regards
thehorseman is offline   Quote Quick Reply
Old 05-18-2011, 12:18 PM   #4
President, ThumbJeeps

WF Supporting Member
sevenservices's Avatar
Join Date: Sep 2009
Location: Mid-Michigan/Thumb
Posts: 3,947
President, ThumbJeeps
CB Callsign "AirForce One"

1994 Wrangler YJ I6 4.0 H/O Auto 3 spd. 4" RC (33x12.5) (15x8) 3:54 Gears
sevenservices is offline   Quote Quick Reply
Old 05-19-2011, 12:15 AM   #5
Join Date: Jul 2010
Posts: 26
Don't have the valve he was talking about so this weekend I'm having my neighbor come over to take a look at it.
thehorseman 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
Thing's to know when Buying a Used Jeep Wrangler YJ Rian306 YJ Tech Forum 26 06-23-2014 09:55 PM
Cherokee Master Clutch Kits - Free Shipping! AOR Vendor Spotlight! Great Deals for Members. 0 04-25-2011 10:35 AM
Biggest Jeep Freek Contest!!!! txoutdoorx4 Classifieds Archive 6 02-21-2011 10:48 AM
History of the Jeep. George T. General Jeep Discussion 8 02-04-2009 01:03 AM
My Jeep turns a lot of heads in town... DoubleUp686 General Jeep Discussion 13 08-01-2006 11:40 AM

» Featured Product

All times are GMT -5. The time now is 08:05 PM.

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