1989 Wrangler 4wd vacuum schematic - Pirate4x4.Com : 4x4 and Off-Road Forum

mkozlows · 10-18-2007, 04:56 AM

I have a 1989 Wrangler sitting in my garage that I need some help on, it belongs to some guy who bought it with a blown motor. Well I had a good one sitting out back of the garage, so I sold it to him. Long story short, he let his kid change out the motor, The kid hacked out anything that was in his way, including the vacuum lines for the 4wd.

Anyway, they could not get it to run, so I guess, because I sold the motor to him, I should be the one to fix it. Well I fixed the wiring, put a Rochester carb on it, and got it running, ( It now runs great )

Now the problem, as stated above, the kid hacked out the vacuum lines, from the motor over to the vacuum module under the battery box. I have no earthly idea how they are supposed to go, I have both a Chilton and Haynes Manuals, but they offer very little help. Anyone out there have any suggestions where I can find out the correct hook ups. with all the darn Jeeps I own, none of them use the same system....Thanks for the help.

mikeswrangler · 10-25-2007, 02:19 PM

can you post a pict of the box.. and is there a red line ?? if so its the one that goes to the manifold.. if nothing else .. take a tee and put it in a good vac source.. and try to hook up to difernt points to see if it works..
you could try to use a air tank and go from the vac disco and put air to it and follow the sound to find where it goes to I would disconect the transfer case 4 prong plug before you apply the air to it (if you have a regulator) use 5-10 psi and dont use it on the vac disco valve or you can blow it out
thats what I would do

good luck

mike

n0mad · 10-26-2007, 12:16 PM

All that vacuum shit in the YJ pretty much sucks. Considering the vacuum disconnect is unreliable when it's in "working" condition, look into the alternatives:

Homemade posi-lock for $20:

http://home.earthlink.net/~stevensch...h/cabledis.htm

Upgrade to TJ shafts (which will make it stronger in the long run):

http://www.stu-offroad.com/axle/yjd3...jconvert-1.htm

SpringOverYJ · 10-26-2007, 05:31 PM

This what you are looking for?

10-18-2007, 04:56 AM	#1 (permalink)
mkozlows Registered User Join Date: Oct 2005 Member # 55849 Location: Townshend, Vt Posts: 276	1989 Wrangler 4wd vacuum schematic I have a 1989 Wrangler sitting in my garage that I need some help on, it belongs to some guy who bought it with a blown motor. Well I had a good one sitting out back of the garage, so I sold it to him. Long story short, he let his kid change out the motor, The kid hacked out anything that was in his way, including the vacuum lines for the 4wd. Anyway, they could not get it to run, so I guess, because I sold the motor to him, I should be the one to fix it. Well I fixed the wiring, put a Rochester carb on it, and got it running, ( It now runs great ) Now the problem, as stated above, the kid hacked out the vacuum lines, from the motor over to the vacuum module under the battery box. I have no earthly idea how they are supposed to go, I have both a Chilton and Haynes Manuals, but they offer very little help. Anyone out there have any suggestions where I can find out the correct hook ups. with all the darn Jeeps I own, none of them use the same system....Thanks for the help.

10-25-2007, 02:19 PM	#2 (permalink)
mikeswrangler Registered User Join Date: Apr 2003 Member # 19089 Location: venus ,texas Posts: 762	can you post a pict of the box.. and is there a red line ?? if so its the one that goes to the manifold.. if nothing else .. take a tee and put it in a good vac source.. and try to hook up to difernt points to see if it works.. you could try to use a air tank and go from the vac disco and put air to it and follow the sound to find where it goes to I would disconect the transfer case 4 prong plug before you apply the air to it (if you have a regulator) use 5-10 psi and dont use it on the vac disco valve or you can blow it out thats what I would do good luck mike __________________ 93 wrangler,456 gears,33x12.5 tires,on board air,3" bodylift,4" shackels, front axel open, rear track lock , daily driver, spring over ... passenger side step ..for wife to get in.. 91 4runner stock for now with 32's

10-26-2007, 12:16 PM	#3 (permalink)
n0mad Registered User Join Date: Aug 2005 Member # 52333 Location: portland, or Posts: 186	All that vacuum shit in the YJ pretty much sucks. Considering the vacuum disconnect is unreliable when it's in "working" condition, look into the alternatives: Homemade posi-lock for $20: http://home.earthlink.net/~stevensch...h/cabledis.htm Upgrade to TJ shafts (which will make it stronger in the long run): http://www.stu-offroad.com/axle/yjd3...jconvert-1.htm __________________ 1988 YJ with stuff

10-26-2007, 05:31 PM	#4 (permalink)
SpringOverYJ Registered User Join Date: May 2001 Member # 4426 Posts: 111	This what you are looking for? Attached Images

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