Last edit by: IB Advertising
See related guides and technical advice from our community experts:
Browse all: Four Wheel Drive Guides
- Jeep Cherokee XJ 1984 to 1996 Why Won't 4WD Engage
Guide to diagnose trouble and recommended solutions
Browse all: Four Wheel Drive Guides
4wd not engaging
#1
Newbie
Thread Starter
Join Date: Dec 2008
Posts: 5
Likes: 0
Received 0 Likes
on
0 Posts
Model: Cherokee
4wd not engaging
Hello
I have a 91 jeep cherokee I just bought. The 4wd does not engage. I think that it is a vacuum issue. there are 3 vacuum line on the actuator motor and the one closest to the fork does not have anything connected to it it looks like from the manual it tee's into the vacuum line on the same side of the diafram, is this correct? Thanks
This picture shows the 2 attached, there is one more vacuum connection right behind the one in the left of the engine.
I have a 91 jeep cherokee I just bought. The 4wd does not engage. I think that it is a vacuum issue. there are 3 vacuum line on the actuator motor and the one closest to the fork does not have anything connected to it it looks like from the manual it tee's into the vacuum line on the same side of the diafram, is this correct? Thanks
This picture shows the 2 attached, there is one more vacuum connection right behind the one in the left of the engine.
#4
Seasoned Member
Join Date: Oct 2008
Posts: 320
Likes: 0
Received 0 Likes
on
0 Posts
Year: 1996
Model: Cherokee
Engine: 4.0
look on the back of the drivers sun visor mine has a sticker that says "Select-a-trac" and informs me of the proper useage of each gear on the tc
#7
Member
Join Date: Nov 2008
Location: Kennedale, Tx
Posts: 173
Likes: 0
Received 0 Likes
on
0 Posts
Year: 1995 2WD & 1988 4WD
Model: Cherokee
Engine: 242
Look over the diagram and compare your lines. you will also have a dash light that will say "part time" when you are in 4H and 4L. the light is vac. operated also , the switch for the light is on the left fender by the blower motor and below that is where the vac. lines come up from the axle.
here is a write up on this setup > https://www.cherokeeforum.com/f51/mystery-vacuum-disconnect-dana-30-a-6966/
here is a write up on this setup > https://www.cherokeeforum.com/f51/mystery-vacuum-disconnect-dana-30-a-6966/
Trending Topics
#9
Newbie
Thread Starter
Join Date: Dec 2008
Posts: 5
Likes: 0
Received 0 Likes
on
0 Posts
Model: Cherokee
I cant seem to find the T/C Vacuum switch. I have verified and the fork moves freely as well as the sleeve in the axle. I have vacuum to both sides of the motor and it appears to also be working.
When i shift into 4 wheel I DONT get a light on the dash.
In this picture it show the vacuum motor The sensor on the end is cut, would this prevent the 4wd to turn on.
And this picture shows the vacuum hose that is not connected.
When i shift into 4 wheel I DONT get a light on the dash.
In this picture it show the vacuum motor The sensor on the end is cut, would this prevent the 4wd to turn on.
And this picture shows the vacuum hose that is not connected.
#10
Newbie
Thread Starter
Join Date: Dec 2008
Posts: 5
Likes: 0
Received 0 Likes
on
0 Posts
Model: Cherokee
I just soldered some wire onto the sensor and wired it back in and now part time light comes on. How would I check to make sure that the transfer case is working, I can't tell if it is engaged driving it.
#11
CF Veteran
Join Date: Apr 2010
Location: fallon, nv
Posts: 1,053
Likes: 0
Received 0 Likes
on
0 Posts
Year: 1988
Model: Cherokee
Engine: 4.0
my 88 xj is having the exact same issue and ive tried all this as well as throwing it up on a lift and engaging the tcase to verify that it is engaging and im just totally stumped...HELP!!!!!!!
#13
Member
Join Date: May 2010
Location: Holliston ma
Posts: 142
Likes: 0
Received 1 Like
on
1 Post
Year: 1989
Engine: 4.0 I6 efi
A great thing to do to these axles is bypass the cad system
Pete made a great write up over on CC
http://www.comancheclub.com/forums/v...hp?f=9&t=18415
My system hasn't failed me since I did this.
Pete made a great write up over on CC
http://www.comancheclub.com/forums/v...hp?f=9&t=18415
My system hasn't failed me since I did this.
#14
CF Veteran
Join Date: Dec 2010
Location: Finger Lakes Region NY
Posts: 1,234
Likes: 0
Received 1 Like
on
1 Post
Year: 1990
Model: Cherokee
Engine: 4.o
Yeah i'M bringing this one back from the dead. there is a link in here with Great step by Step Info. and isn't that why we are all here in the first place.
(yeah we come here to joke around too but i can get laughed at and called stupid by my wife, so there.)
(yeah we come here to joke around too but i can get laughed at and called stupid by my wife, so there.)
#15
::CF Moderator::
Join Date: Aug 2011
Location: Prescott, Az
Posts: 43,872
Received 1,526 Likes
on
1,238 Posts
Year: 1990
Model: Cherokee (XJ)
Engine: 4.0
A great thing to do to these axles is bypass the cad system
Pete made a great write up over on CC
http://www.comancheclub.com/forums/v...hp?f=9&t=18415
My system hasn't failed me since I did this.
Pete made a great write up over on CC
http://www.comancheclub.com/forums/v...hp?f=9&t=18415
My system hasn't failed me since I did this.
This^^.
And fWIW, vac discos were on CommandTrac only. SelecTrac didn't have them.