Question about 1991 Jeep Wrangler

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I have a 1991 wrangler I bought used and there is a vacuum line coming from the transfer case that is not connected and I can't find where it should go.

There are four vacuum lines connected at the transfer case one goes to the intake manifold and two go to the front rear shift motor but the fourth one is not connected to anything it ends in the engine compartment by the battery

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  • Jeep Master
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Are you sure it is not a vent hose ?

Posted on Jul 13, 2013

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Posted on Jan 02, 2017

MikenAsh
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SOURCE: 1993 Jeep Wrangler Sahara Transfer Case

Sorry, but my solution would be to take that drive back to the dealership, if he has a warranty. This is a hands on type deal, you have to trace everthing with your hands. Now it sounds to me like it could be in the electronics. You have to go to the differential, find the vaccum lines, if equipped, some are not, then trace them back to the motor and make sure they aren't cracked or broken. I hope this solution was helpful, please rate. Thanks

Posted on Sep 28, 2008

  • 6982 Answers

SOURCE: On my 1993 Jeep Grand Cherokee the vacuum line

If it's attached to the diff housing and not to the box on the r/f axle (if you have one) it is a vent hose. Just secure it anywhere out of the way on the firewall. Don't pull it tight or when the axle moves it will fall off again!

Posted on Oct 09, 2009

witmoz
  • 389 Answers

SOURCE: I need to know where transfer case vacuum lines go

pass side firewall to front lock up unit to trans/transfer and back to front

Posted on Jun 12, 2010

ZJLimited
  • 17970 Answers

SOURCE: I have a 96 Jeep

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1995-96 V-8 engine vacuum diagram-1997-98 V-8 engines similar; be sure to check the VECI label in the engine compartment

Also I have a GC, 1993, and I noted that besides maintaining a vent hose that is not going anywhere, just this subject with a ribbon next to the front suspension.

Hope helps (remember rated this).

Posted on Aug 12, 2010

Testimonial: "Well don't know if worked yet, but diagrams great! Thanks!"

  • 450 Answers

SOURCE: I need a diagram of

the spring is not working and you need to take it back also there may be another dvd in it to

Posted on Sep 02, 2010

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1 Answer

1991 s10 4 wheel drive will not work manual shift


Look for the vacuum connector near the brake booster should have a vacuum line coming from the engine to a plastic " T " these always fall off after time use a small zip tie to re-secure the rubber hose to the plastic connector, check all the vacuum connections at the engine and down near the front axle and transfer case.

Sep 28, 2014 | 1991 Chevrolet S-10

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Transfer case won't engage the front differential. Transfer will shift into all ranges, but will not engage.


95 wrangler has a Split front axle, check the unit on the front axle pass. side. Make sure vacuum line are connected and good.

Dec 28, 2009 | 1995 Jeep Wrangler

2 Answers

4 wheel drive won't engage...how do I check it?


Hi Buganbird22

I pretty much have the same problem. The odds are that it isnt the transfer case at all.

That model year has an electric over vacuum control switch on the transfer case and 2 electric over vacuum switches on the passenger side front fender well near the rear by the hood hinge, they are either green or blue and made of plastic, they both have vacuum lines and 2 wires connected to them.

From there the vacuum lines run down near the front differential where they connect to a slave cylinder. the vacuum routes one way, the slave plunger moves and the differential engages 4WD, the vacuum routes the other way, the slave plunger moves again and the differential disengages 2WD (similar to a 90's model dodge 4x4).

Run this easy test. Label the vacuum lines that come from the top of the vacuum switches on the fender well (front, rear) use masking tape.

Start your truck. (make sure one of those switches has vacuum, put your finger over the nipples where you unplugged the lines, if you feel suction, you got vacuum) trade the vacuum lines, front to rear and rear to front. shift into 4x4, you wont get a 4x4 light, but if you now have 4WD then the problem is in the circuit somewhere between those 2 switches and the master switch on the T-case.

I'll post more as I go. I've been switching mine that way for a week now, because i'm too lazy to fix it in 2 feet of snow.


Dec 13, 2009 | 1991 Toyota 4Runner

2 Answers

1991 jeep wrangler won't pass evap test,i replaced the two filler hoses at gas tank?


make sure you get a cap from the dealer. I had similar issue.... bought cap from autozone...still threw the code....thought must be something else.

ended up replacing all the vacuum lines ... still threw a code

desperate, bought new cap from dealer.... problem solved!

Aug 23, 2009 | 1991 Jeep Wrangler

1 Answer

1992 Jeep 4 wheel drive vacuum line for front axle


there is a vacuum switch on top of the transfer case it applies vacuum when the truck is shifted in to 4 wheel drive . if you connect it to direct vacuum you front axle will be engaged all the time

Jun 12, 2009 | 1992 Jeep Wrangler

1 Answer

1987 Jeep YJ [Wrangler] so owner ship says''


Our Jeep Wrangler YJ's are equipped with a vacuum module on the front axle. It is used to engage the front axle when the transfercase is shifted into 4WD. Check the vacuum lines on the front axle to make sure they are connected. The passenger side axle shaft has a disconnect sleeve that is moved left and right by the vacuum.

Mar 01, 2009 | 1987 Jeep Wrangler

1 Answer

Four wheel drive does engage.


Assuming that everything was working before you started, its most likely that you either forgot to plug something in, or messed up the transfer case linkage adjustment. If you have a front axle with a vacuum motor on it, are the hoses connected at both ends? Also, if you lost any fluid from transfer case or trans while you had them out, make sure you refill them (avoid future problems)

Feb 01, 2009 | 1991 Jeep Wrangler

2 Answers

1990 jeep wrangler front driveline engages but tires dont.


check you vacuum motor and vacuum lines going to the vacuum motor from the top of the transfer case. when u engage your 4WD the valves on the transfer case are opened by a switch on the transfer case. the lines coming from the switch cross the top of the transmission and up the passenger side of the engine compartment. these lines will be red, blue, green and yellow, and often covered by a black sheeth, about 1inch in diameter. check these lines to make sure they are connected. if they are not, the vacuum motor will not engage your front axle. your front driveshaft will still spin, because the transfer case is engaged as normal, but the right front axleshaft is a 2 piece system engaged by this vacuum motor. if they lines are messed up, the motor will not engage the axle collar connecting the 2-piece axle. if your vacuum motor is working, then you might have a broken collar, or perhaps a broken axle shaft. but it's probably just the vacuum hoses or the motor :) i hope that helps!

Nov 15, 2008 | 1990 Jeep Wrangler

1 Answer

1993 Jeep Wrangler Sahara Transfer Case


Sorry, but my solution would be to take that drive back to the dealership, if he has a warranty. This is a hands on type deal, you have to trace everthing with your hands. Now it sounds to me like it could be in the electronics. You have to go to the differential, find the vaccum lines, if equipped, some are not, then trace them back to the motor and make sure they aren't cracked or broken. I hope this solution was helpful, please rate. Thanks

Sep 28, 2008 | 1993 Jeep Wrangler

1 Answer

Four wheel drive 91 wrangler


check the wires on the transfer case mine got melted by my exhaust somehow and i just have learned to deal with it lol.

Jul 16, 2008 | 1991 Jeep Wrangler

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