what the hells going on with my 4x4. - 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 04-16-2008, 05:17 PM   #1
Join Date: Apr 2008
Posts: 15
Angry what the hells going on with my 4x4.

my 90' jeep yj will not engage into four wheel drive. i bought the book on the jeep and did all the tests with a vacume pump and the actuator and shift motor holds a vacume which is all the book says about trouble shooting the system. i unhooked the vacume line from a "thing" mounted on the firewall that is just to the side of the battery. i hooked my vacume pump up to it and put it in 4x4 and the fourwheel drive engages. i went off road with the vacume pump attached to that line..... i have yet to find a single person that can tell me what that "thing" is or what it does. the book does not mention it at all, it has no part numbers on it, and every parts shop looks at me with the "what the hell is that" face when i try to find a new one. it has two wires attached to it, a hot wire thats putting out 14.4 volts, and a ground wire, which makes me believe it is not a switch, and way to small to be a vacume pump. if anybody out there knows what the hell i should do i would appreciate it. i have ordered the vacume actuator? that is mounted to the top of the transfercase w/four vacume lines coming out of it. in hopes that that will fix it. any help is appreciated.

Captaincoop1220 is offline   Quote
Old 04-16-2008, 07:38 PM   #2
jpdocdave's Avatar
Join Date: Mar 2008
Location: beach park, il
Posts: 8,162
Images: 7

here's a good thread on this. talks about fixing vacuum probs, and the posi lock that bypasses vacuum B.S. and uses a cable. good luck
"The danger to America is not Barack Obama but a citizenry capable of entrusting a man like him with the Presidency. It will be far easier to limit and undo the follies of an Obama presidency than to restore the necessary common sense and good judgment to a depraved electorate willing to have such a man for their president."
jpdocdave 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

Download our Mobile App

» Featured Product

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

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