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Unread 12-15-2010, 04:54 PM   #1
Svyse
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1992 YJ Wrangler 
 
Join Date: Dec 2010
Location: Beaumont, Texas
Posts: 24
4wd not working

Ok so when i put my jeep the guy i bought it from told me the 4wd wasnt working, but the only reason was beacuse of a rubber hose that rotted out. If some can help me with this i would appreciate it thanks

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Unread 12-15-2010, 06:22 PM   #2
ALPHA-1
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1993 YJ Wrangler 
 
Join Date: Jul 2009
Location: Upstate NY
Posts: 67
Put the jeep in neutral, Turn it on (just let it run for all of this) and Put in 4WD. LEAVE IN NEUTRAL!!!! But with 4wd selected instead of 2wd.There are two small hoses "about shoelace width" that go to the 4wd actuator under the passenger side. The actuator is bolted to the axle. . Pull the hoses off (may have to break the zip ties that hold the little hoses on) and see if one is sucking by holding your fingure over it. Make note which hose is sucking. Then put in 2WD (but still in neutral) and see if the OTHER hose is sucking. When in 2wd one should suck and in 4wd the other should suck. They alternate sucking lol. If you have suction from both (alternately) then your vacuum system is fine. The actuator might need to be replaced OR just free up the gunk keeping it from moving (that's what I did). Let me know how it works out. if you need help just message me. <---- Literally!
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Unread 12-15-2010, 06:41 PM   #3
kloppk
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1992 YJ Wrangler 
 
Join Date: Oct 2006
Location: Massachusetts
Posts: 2,700
The passenger side one sucks in 2WD and the drivers side one sucks in 4WD.

Vacuum diagram of the system.
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Unread 12-16-2010, 08:43 AM   #4
Svyse
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1992 YJ Wrangler 
 
Join Date: Dec 2010
Location: Beaumont, Texas
Posts: 24
thanks for the help ill try that today and let you know how it works out
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Unread 12-17-2010, 02:07 PM   #5
ALPHA-1
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1993 YJ Wrangler 
 
Join Date: Jul 2009
Location: Upstate NY
Posts: 67
Did you figure it out yet? Is it the vacuum not working or something else (ie the actuator)
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Unread 12-17-2010, 02:40 PM   #6
JDNightFox
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1989 YJ Wrangler 
 
Join Date: Feb 2010
Location: AZ
Posts: 68
I need to get my 4WD fixed... the shift fork won't engage and there's absolutely no suction from anywhere
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Unread 12-17-2010, 03:41 PM   #7
Svyse
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1992 YJ Wrangler 
 
Join Date: Dec 2010
Location: Beaumont, Texas
Posts: 24
i tried all that i have suction on 2wd but my transfer case isnt letting me put it in 4wd to try it out...so i dont know if i need to drop my transfer case and pull it apart or what
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Unread 12-17-2010, 03:49 PM   #8
Brown6041
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1995 YJ Wrangler 
 
Join Date: Nov 2008
Location: baton rouge
Posts: 217
i have a brand new vacuum harness i will sell you it is in the box still
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Unread 12-17-2010, 05:26 PM   #9
Svyse
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1992 YJ Wrangler 
 
Join Date: Dec 2010
Location: Beaumont, Texas
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i dont know if its the actually vacuum though the shifter wont let me engage it in 4wd do the hoses need to be put back on before i engage it in 4wd
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Unread 12-18-2010, 07:16 AM   #10
GreenRenegade
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2013 JK Wrangler 
 
Join Date: Sep 2010
Location: Grovetown, GA
Posts: 228
Not sure exactly why it's not letting you move the selector. Are you auto or 5 speed? It may not move if you are in Park (not sure, haven't tried). If that isn't the case, look under the frame and see if the lever or mechanism is catching on something or if the linkage is catching somewhere. If you don't see anything, you may have to take off the floor cover and take a peek from the top. It could be something as simple as a small stone lodged in there somewhere.
If all looks good and still wont move, disconnect the linkage and see if it moves then. If it doesn't move, you need to take a closer look and see where it's catching at or if it's completely rusted stiff. If it moves, it's not the shifter (obviously, huh?).
Anyways, follow the linkage with your fingers and a flashlight and see where that bugger is catching. Hopefully you find where it might be binding or bent and you'll be able to fix it. If not, it has to be in the t-case. That's where I have to let you make your own decisions as I have never snooped at the internals of a t-case.

Dan
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Unread 12-18-2010, 09:08 AM   #11
Svyse
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1992 YJ Wrangler 
 
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Location: Beaumont, Texas
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thanks for all the help...when i get time this week i'll give it a closer look and let you know what i found
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