Vacuum/4wd Problem

[JeredYJ]

1075189

I recently got a '91 jeep wrangler (5-spd/6cyl.) and found that the front axles will not lock in 4wd. The xfer case will switch to low gearing, but no front traction. I pulled the double-vacuum connection off the front axle and even as someone shifted back and forth between 2 and 4wd the suction did not change (only got suction from one side - did not alternate) Could this be the vacuum switch on the transfer case? Should I check other places before I change out that switch? Could it be a leak anywhere?
Your veteran input would be greatly appreciated by this beginner jeeper! Thank you!
Jered :-? [addsig]

 

[Tug-n-pull]

1075190

For the best and ezest fix for this go here. good luck and if you have questions let me know. Welcome to the board. tug[addsig]

 

[jhiggins]

1075196

Welcome and GOOD LUCK I think the vaccuum harness
is the worst thing jeep ever made but Tug will
help you out with his quick fixer up...Or if you got the $$$$
go for a 4X4 posi-lock cable.... :-D [addsig]

 

[XJNick]

1075213

Yes, sounds like a bad vacuum switch on the T-case.

-Nick[addsig]

 

[JeredYJ]

1075215

Well, looks like I'll be attempting the x-case vacuum swich replacement this Thurs... (hey- at least its not too expensive :-D ) If that dosen't work, back to the drawing board and I'll be attempting a home made in-cab posi-lok! :-?
Jered[addsig]

 

[Bounty__Hunter]

1075255

Check the vacuum lines before replacing that switch in the transfer case, the line w/o vacuum may have a hole/break somewhere. If it's intact, probably the switch.

The vacuum 4wd system is not that bad once you get used to maintaining it and troubleshooting it. You did right by feeling for vacuum in the two lines to the front axle.[addsig]

 

[JeredYJ]

1075346

:-D Ok, I'll definitly check it first. Thanks! [addsig]

 

[JeredYJ]

1076110

:-D All is well: 4wd working and had a GREAT and muddy weekend!" Problem was switch on x-case afterall! (I made sure to check all the lines first!) Thank you for all your help, everyone!
-Jered[addsig]

 

[jhiggins]

1076111

Glad to hear that all is good ....Let's see some pic's
...Have a good one.......... :-D [addsig]

 

[Snitty]

1076120

good to know its working... those vacuum systems are a common problem with us jeepers[addsig]

 

[MudDawg]

1076260

Dang Tug....I'd say that was some dern good thinkin'... :-D [addsig]