Question about 1991 Jeep Comanche

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Broken 4 wheel drive cable 1991

Changed my old vacuum seal for a pull straight cable and it has broken I was wondering if I can fix it our have to buy a new set up.

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I sold my 91. but what is a vacuum seal,
where is it, what system, (engine ,tranny, or transfer case?)
what cable. im at a loss....?????????????

Posted on Nov 25, 2013


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Posted on Jan 02, 2017

  • 74 Answers

SOURCE: Vacuum lines for 4 wheel drive

if you look under the Jeep on the passenger side of the front axle you will see a vacume mod its kind of round shaped it should have a vacume plug on it wit ha few hoses going into it make sure its plugged in for starters these come off all the time if it looks good here simply follow the lines into the engine compartment and look for broken hose this should get you a fix most of the time, the mod could be defective but not likely.

Posted on Nov 28, 2008

  • 33 Answers

SOURCE: 1991 wrangler 4x drive

its the automatic locking hub mecanizm replace with after market manual hubs and that should be the end of that

Posted on Dec 29, 2008

  • 1 Answer

SOURCE: 4 wheel drive not engaging

I do not have a vacuum diagram for the 89 Cherokee, but my 89 had the same issue several times and all it was is that the block of vacuum lines that go into the front axle on the rear of the axle on the passenger side of the vehicle. I ended up having to put a zip tie around the axle and hose block to hold it on. Have not had the issue again since doing this. Hope that helps.

Posted on Jan 25, 2009

  • 166 Answers

SOURCE: 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

Posted on Jun 12, 2009

  • 122 Answers

SOURCE: where can I get a parts diagram of the vacuum hose, register for free repair info

Posted on Feb 22, 2010

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1 Answer

2002 Sonoma no 4 wheel high

Try this Sonoma forum:

One comment was: "
Warn used to sell replacement solenoids for these that fixed the problem, I had to buy one, I also used braided coverings on all of my vacuum lines to avoid the exhaust problems with melting the lines. There have also been companies over the years, that sold replacement electric systems to replace the vacuum systems in the GM rigs." Another: Same thing I thought when it first happened on the one I had, but low and behold, it was melted vacuum lines, seems to be a very common problem on many GM 4x4 vehicles, which is why the aftermarket companies have made solutions for it.

One other thing, I forgot to mention, you need to check the vacuum valve that is located on the wheel well under the hood, there is a vacuum line that goes in one side and a cable that goes out the other side, the vacuum closes the valve and the closing of the valve pulls on the cable that pulls the gear into the 4wd position, the older the valve the more likely it is to have a pin hole in it, that will not allow the vacuum pressure to close it. I have had that happen as well, I replaced it with an electric switch kit from one of the companies, which replaced the vacuum valve, when you activated the 4x4, the electric solenoid pulled on the cable."

I hope this helps you out!

Feb 12, 2017 | Cars & Trucks

1 Answer

4 Wheel drive (Manual trans) not engaging

First, IF your vehicle has a true manual-engage for the 4-wheel drive, then you either have a linkage that needs adjusted, or there is a problem inside the transfer-case (ie- broken shift-lever, broken chain, or loose gear, depending on which metod of drive it has (they WERE gear-to-gear, in my 1981 Isuzu, which means no chain to break...)
OR- if your vehicle has the same system of activation on the 4-wheel drive, as the Chevrolets of that era (Isuzu and Chevrolet were together and may still be), it's probably a vacuum problem. See, there is a vacuum-pot that pulls the cable to actuate (lock-in) the front-axle, using vacuum from a line on the transfer-case (vacuum that comes from the engine). IF there is a hole in any of the lines &/or if the vacuum-pot itself has a hole in it, then your 4-wheel drive linkage (on the front-axle) WON'T be pulled-in, so it won't engage, at all. This happened to me in my 2000 ZR2 during a snow-storm! It clicked, but wouldn't engage.
Go online or get a reference-manual from Oreilly's, Autozone, etc. to see how your system is actually actuated.
If it is manually actuated, then look for a linkage or a line that needs adjusted (HOPE it's not inside the case!) or IF it is vacuum actuated, then you can test it by starting the engine and spraying all the lines and the vacuum-pot with WD40 or other aerosol, to see if the engine revs- which will tell you where the problem (leak) is.
Either way, GOOD luck!

Dec 21, 2013 | 1997 Isuzu Rodeo

2 Answers

4wd is stuck in 4low was going to try to disconnect the 4wd so i could get it back to 2wheel to be able to drive it how do i do this

Its a vacuum opperated system. There is a vacuum line on the transmission but ufrortantly the transmission will not work correctly with this disconnected. That controls what is called an actuator its a vacuum moter its located under the battery tray and this pulls on the cable that makes it shift in and out of 4 wheel drive.Try disconnecting the cable at the actuator and pulling back away from the engine this may pull part # 9 the carrier conector out of the out put shaft part # 23 and disengage the 4 wheel so you can drive in 2 wheel with no side affects although you would have to replace # 9 or # 23 or bolth to make the 4 wheel work again but then again if you do this it may workthe gears just got bound up and it might work but i wouldn't push my luck with it until it was apart and could inspect the parts.

Dec 28, 2010 | 1999 Chevrolet Blazer

1 Answer

My granny gear and rear wheels power but front wheels don't power at all in four wheel drive

I would first check the vacuum disconnect on the front axle (dana 30). The vacuum lines often become clogged and/or broken, especially when wheeling a 20 year old Jeep. My solution for my '93 YJ was the cable option which replaces the vacuum one (try Quadratec). This way I had a more positive feeling and no more vacuum issues to worry about.

Dec 17, 2010 | 1991 Jeep Wrangler

1 Answer

I have a 5 speed manual 91 dodge dakota and my 4 wheel drive is not working when i put it in gear it just stays in 2 wheel drive some one told me its a vacuum problem is this correct?

There is vacuum switch on the transfer and you can remove the two vacuum lines on the front axle,
pass side and pull a vauum on canister, to test for the rod engaging,with wheels off ground,and turning them

Nov 23, 2010 | 1991 Dodge Dakota

1 Answer

My 2006 f250 pops in and out of 4 wheel drive by

if the front axel seals are starting to leak this could be the problem,very common. the 4WD on this vehicle uses vacuum to make the system work=leakings seals low or no vacuum no 4WD.get back to me if you need more help,PLEASE rate my fix as i strive to be the best Thanks Ray

Feb 10, 2010 | 1998 Ford Explorer

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4 wheel drive wont disengage

shift motors are stuck.or check to make sure shift motors getting vacuum.

Apr 17, 2009 | 1991 Ford Bronco

1 Answer

1991 GMC Jimmy4 wheel drive not working

those are engaged by vacuum on the pass. side on the fender well under the hood there is a diaphragm that will pull in when put in 4x4 many times the vacuum lines get old and crack or get pulled off. The lines go to the transfer case and to the vacuum canister as well as the diaphragm on the fender well. If you have a vacuum leak it will cause it not to pull so if your vents don't change over good you have a leak elsewhere and that needs to be fixed. I don't like the vacc. engaged 4x4 but when it works it is a light weight shift on the fly design that you don't have to worry about the shift motors getting stuck or corroded.

Dec 22, 2008 | 1999 GMC Jimmy

2 Answers

1999 chev blazer 4x4 system

I have a 1999 chevy blazer that stuck in 4 wheel drive. How do you get it out.

Nov 23, 2008 | 1999 Chevrolet Blazer

1 Answer

Vacuum lines for 4 wheel drive

if you look under the Jeep on the passenger side of the front axle you will see a vacume mod its kind of round shaped it should have a vacume plug on it wit ha few hoses going into it make sure its plugged in for starters these come off all the time if it looks good here simply follow the lines into the engine compartment and look for broken hose this should get you a fix most of the time, the mod could be defective but not likely.

Sep 03, 2008 | 1991 Jeep Wrangler

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