im having problems with my 4wd the vacumm engager will not let the 4wd engage. any tips?!

 

Just replaced my buddies vacuum setup with a manual locker cable, it locks in and eliminates the problems with vacuum source or hoses going out.

 

check and make sure the plug on trans is pluged in and for vacuum

 

Just went through the same problem. Try to clean the nipples on the vacuum motor.

 

sounds like a vac leak

 

I don't think 90's had the vacuum CAD, at least mine doesn't. Didn't they stop that in 87 or something? Somebody educate me..

Are you sure its not a linkage issue?

 

my 88 xj had vac disc. i changed it....my 94 yj had it. Try searching the cable, i cant remember the name but i used one on another jeep and it worked good, plus you can have 2 low for creeping if you dont lock the front

 

I've heard of a mod too, where you simply ditch the whole troublesome vacuum system and lock the shift fork in the engaged position to make it just like a non CAD dana 30. If you interested a quick google search should bring a writeup or two.

 

Search for diy posi lock.

 

if you are handy just cut open the vac unit on the housing and go to you local truck/equiptment store and buy a pto cable (a choke cable isn't strong enough) and i just drilled a hole through where the vac diaphagm was attached and presto cost me like $25 bucks (this was done to a yj) my XJ has the solid right axle