1989 Wrangler 4wd vacuum schematic - Pirate4x4.Com : 4x4 and Off-Road Forum
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Old 10-18-2007, 04:56 AM   #1 (permalink)
Join Date: Oct 2005
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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.
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Old 10-25-2007, 02:19 PM   #2 (permalink)
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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

looking for one to build again..
Back in the sac area again!!! glad to be back again!!!!!
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Old 10-26-2007, 12:16 PM   #3 (permalink)
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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:


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

1988 YJ with stuff
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Old 10-26-2007, 05:31 PM   #4 (permalink)
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