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Unread 09-04-2011, 09:00 PM   #1
gotrock88
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1990 YJ Wrangler 
 
Join Date: Feb 2011
Location: las vegas, nv
Posts: 42
4 wheel drive not engauging

So today while out on a run, my 4 wheel drive decided to stop working. When I got home to figure it out I checked first thing to see if I had any vacuum at the axel and there was none. After going over the vacuum lines thru out the jeep, I found that it is all jacked up and there is almost none anywhere. Then I noticed that fuel was starting to leak out of the vacuum canister. Could the two be related? So I am stumped on what to do next, any suggestions?

Thanx

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Unread 09-05-2011, 06:58 AM   #2
danlee
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1987 YJ Wrangler 
 
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The vac system is junk, in my opinion, I went to a cable style posi lock, so far so good.
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Unread 09-05-2011, 08:13 AM   #3
cstone94
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1995 YJ Wrangler 
 
Join Date: May 2011
Location: Martinsville, VA
Posts: 725
Mine did the same. I had to replace the thing that sticks down into the t-case when 4wd is engaged from the vacuum. Ill try to get the name of it.
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11' F250 - DD

1982 Toyota Pick-Up - Spray-On Yellow Rhino Lined - Chevrolet 305 H.O. - SM465 - NP208C - All-Pro Off Road 5" Springs - 35x15.50x15 Super Swampers
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Unread 09-05-2011, 08:30 AM   #4
gotrock88
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1990 YJ Wrangler 
 
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Quote:
Originally Posted by danlee View Post
The vac system is junk, in my opinion, I went to a cable style posi lock, so far so good.
That is my plan down the road, but for now I just need to get the thing working.
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Unread 09-05-2011, 08:32 AM   #5
gotrock88
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1990 YJ Wrangler 
 
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Location: las vegas, nv
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Quote:
Originally Posted by cstone94 View Post
Mine did the same. I had to replace the thing that sticks down into the t-case when 4wd is engaged from the vacuum. Ill try to get the name of it.
Did you have to remove the tcase to fix the problem?
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Unread 09-05-2011, 05:13 PM   #6
cstone94
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1995 YJ Wrangler 
 
Join Date: May 2011
Location: Martinsville, VA
Posts: 725
Quote:
Originally Posted by gotrock88

Did you have to remove the tcase to fix the problem?
Nope
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95' YJ - Warn Bumpers/Tire Carrier/Winch - 2.5L - 6" Skyjacker Suspension Lift - 4.10's - Locrite Locker - Dana 35/30 - 35" BFGoodrich KM2's

11' F250 - DD

1982 Toyota Pick-Up - Spray-On Yellow Rhino Lined - Chevrolet 305 H.O. - SM465 - NP208C - All-Pro Off Road 5" Springs - 35x15.50x15 Super Swampers
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Unread 09-05-2011, 07:08 PM   #7
Fenix85182
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1989 YJ Wrangler 
 
Join Date: Jan 2006
Location: Southeastern CT
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Check your vacuum can underneath your battery tray. I had a vac line that used to disconnect under there all the time.

After doing my 4.0 swap, my t-case vacuum switch died--it wouldn't vent properly anymore. I think it was a $40 part from quadratec. Anyway, check your vac lines first before replacing anything. If both the lines are plugged into the vac can, trace back and look for disconnected lines. I used to have vac lines come disconnected at the back of the head by the firewall.
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Unread 09-05-2011, 08:15 PM   #8
dancytron
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1990 YJ Wrangler 
 
Join Date: Jun 2008
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The vacuum lines are 20 years old. More than likely that's the problem. If you want it to be dependable, then replace them all.

Search, there are many threads.

You should test the vacuum motor on the axle to see if it works. Get some vacuum line, jack up the front right tire, start it up in neutral (safely), and run vacuum directly to each of the ports and spin the tire to see if it locks (look to see if the front driveshaft is spinning).

Don't know about the fuel leaking, that sounds bad.

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