Jeep Wrangler Forum - Reply to Topic
Jeep Wrangler Forum

Go Back   Jeep Wrangler Forum > YJ Jeep Wrangler Forum > YJ Build Forum > My 4wd wont engage.

Join Wrangler Forum Today


Thread: My 4wd wont engage. Reply to Thread
Title:
  
Message:
Post Icons
You may choose an icon for your message from the following list:
 

Register Now

In order to be able to post messages on the Jeep Wrangler Forum forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.
User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.
Password:
Confirm Password:
Email Address
Please enter a valid email address for yourself.
Email Address:

Log-in

Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.



Additional Options
Miscellaneous Options

Topic Review (Newest First)
05-06-2013 07:39 PM
piercejoelm Check your vacuum lines. Mine would not engage either on a 95 4.0. I checked all the wiring and traced the vacuum lines by the teams to the transfer case going into the switch, all were fairly new and in tact. I opened the hood and the vacuum hose that went to the most aft nipple on the intake popped off. I put it back on and threw a clamp on it. It immediately worked with the lights and all. Spending time looking for a bad vacuum line is a lot cheaper than doing a $150 mod that you probably do not need to do yet. Just my .02
05-06-2013 12:44 PM
Aswellguy
Quote:
Originally Posted by n2trucking View Post

Here is what they look like.
Thank you! I will be doing this mod this week hopefully.
05-06-2013 10:11 AM
n2trucking
Quote:
Originally Posted by Aswellguy View Post
How did you install the 4wd indicator switch?

Here is what they look like.
05-06-2013 09:58 AM
n2trucking
Quote:
Originally Posted by Aswellguy View Post
How did you install the 4wd indicator switch?

The jeep cherokes have the same kind of 4wd switch on the Transfer case but instead of it having vacum ends on it, it instead has an electric end and you can buy the matching pigtale that plugs into it. It will be a two wire pigtale and all you have to do is run the single wire from the firewall thats off the 4wd vacum light indicator switch and wire it directly to the new Transfer case switch and ground out the second wire thats on the Transfer case switch.

When you shift the T-case the new switch will finish the circuit and ground out the wires just like the 4wd vacum light indicator switch did just without using and vacum.

So what my front axle is always locked. At least i know my 4wd works all the time and i don't feel any problems with the axle being locked.
05-05-2013 09:47 PM
Aswellguy
Quote:
Originally Posted by n2trucking View Post

agreed but i did the washer trick in the half shaft lock. even cheaper. almost free. i had washers laying around but i bought a 4wd indicator switch from autozone for cheap that's for a chearoke and installed it into the t-case and ran the wire and that works great!
How did you install the 4wd indicator switch?
05-01-2013 09:40 AM
n2trucking
Quote:
Originally Posted by dancin1 View Post
Get a diff lock, cable manually operated. $150.00 and never have that problem again, or fix the vacuum system for $150.00 and probably do it again, and maybe again. My diff-lock works great, would never go back.

agreed but i did the washer trick in the half shaft lock. even cheaper. almost free. i had washers laying around but i bought a 4wd indicator switch from autozone for cheap that's for a chearoke and installed it into the t-case and ran the wire and that works great!
05-01-2013 07:46 AM
dancin1 Get a diff lock, cable manually operated. $150.00 and never have that problem again, or fix the vacuum system for $150.00 and probably do it again, and maybe again. My diff-lock works great, would never go back.
05-01-2013 12:11 AM
1994 jeep girl Its the vacuum hoses. I found out they had melted in half some how.
04-30-2013 10:25 PM
Aswellguy Any luck with your jeep? I have the same problem... Changed actuator and transfer case switch... Still no luck.
04-01-2013 11:42 AM
kik
Quote:
Originally Posted by cakes567 View Post
I would check the actuator first. Its very very common to get stuck. If that's not struck then check your lines and go from there.
X2. There's also a switch on the transfer case that could be bad.
03-31-2013 08:55 PM
cakes567 I would check the actuator first. Its very very common to get stuck. If that's not struck then check your lines and go from there.
03-31-2013 07:52 PM
Gunz n tractorz Check the vacuum lines. Put in 4wd and take lines off off diaphragm and see if there is suction on the lines. In not there is a problem with the lines, such as they have a hole in one of them or they just ripped in half like mine did.
03-31-2013 11:05 AM
JD95YJ the vacuum is notorious for going out on YJs.. Sometimes the diaphragm just gets stuck and you can remove it and get it unstuck by moving it a few times, using compressed air, etc.. You can replace the diaphragm, or add on a Posi-Lok system, or other ways to get around it as well. Good luck!
03-31-2013 11:02 AM
1994 jeep girl The light doesnt come. It has a few wiring problems so i thought it was just a part of that.
03-31-2013 03:20 AM
Highvan Does the light come on when you put it into four wheel drive? On my 87, there is a red hose that has to be "T" - ed into a vacuum hose. When i first got my jeep, mine worked fine, then i swapped in a bunch of new parts under the hood and i knocked that little hose off by accident and didn't realize it, then the next time i went to use my four wheel drive, the light wouldn't come on and the four wheel drive wouldn't work, so my guess is, that's what's wrong with yours, cause as soon as i reattached it, it worked fine again
03-31-2013 02:45 AM
1994 jeep girl
My 4wd wont engage.

I have a 94 yj 4cyl 5 speed. I can put it in 4lo nd it gears way down like it should but my front tires wont pull. The drive shaft spins nd the hubs nd axles r fine. My cousin said i may need to "pen" the vacuum hose. Has ne one else had this problem?

Posting Rules
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off


All times are GMT -5. The time now is 12:36 AM.



Jeep®, Wrangler, Liberty, Wagoneer, Cherokee, and Grand Cherokee are copyrighted and trademarked to Chrysler Motors LLC.
Wranglerforum.com is not in any way associated with the Chrysler Motors LLC