smithe1811 Posted February 26, 2010 Share Posted February 26, 2010 So i was out in the snow today, and my 4wd kept popping in and out, the roads were all snow so it wasnt binding on pavement and it only seemed to happen at steady speeds. i was only doing about 25-30. i could feel and hear it jumping in and out and the 4x4 light would turn on and off with the system. 4.0, np231, ba/10, d30/35. vacuum issue? Erik Link to comment Share on other sites More sharing options...
Eagle Posted February 26, 2010 Share Posted February 26, 2010 Most likely vacuum problems. The transfer case shifts into 4WD by the lever. The front axle disconnect shifts by vacuum. The indicator light is also controlled by vacuum, I believe by a switch on the firewall where the vacuum harness feeds down to the axle. If the light goes off and on, your vacuum is intermittent. Link to comment Share on other sites More sharing options...
socal1200r Posted February 26, 2010 Share Posted February 26, 2010 Sounds like a good candidate for locking the CAD... Link to comment Share on other sites More sharing options...
smithe1811 Posted February 26, 2010 Author Share Posted February 26, 2010 Most likely vacuum problems. The transfer case shifts into 4WD by the lever. The front axle disconnect shifts by vacuum. The indicator light is also controlled by vacuum, I believe by a switch on the firewall where the vacuum harness feeds down to the axle. If the light goes off and on, your vacuum is intermittent. So thats where i should start then? got a pic of the switch? this will be my first time working on this system. thanks! :bowdown: Erik Link to comment Share on other sites More sharing options...
mvusse Posted February 26, 2010 Share Posted February 26, 2010 There are three lines going to the CAD. One to lock it in, one to unlock it, and one to go to the switch to turn the light on. If the axle is unlocking AND the light is going off, the vacuum problem is before the CAD because the light goes off BECAUSE the axle disconnects. Vacuum is controlled by the transfer case, but the problem could also be in the vacuum feed to the transfer case. Link to comment Share on other sites More sharing options...
smithe1811 Posted February 27, 2010 Author Share Posted February 27, 2010 so is there a valve or anything i should be checking or am i looking for punctured lines? any common things i should look at first? Link to comment Share on other sites More sharing options...
Pete M Posted February 27, 2010 Share Posted February 27, 2010 1. lock CAD 2. rip out all the vacuum lines 3. cap originating vacuum hole done and done. :D Link to comment Share on other sites More sharing options...
smithe1811 Posted February 27, 2010 Author Share Posted February 27, 2010 Got a write up? i don't see one in the DIY section, pictures are needed Link to comment Share on other sites More sharing options...
Pete M Posted February 27, 2010 Share Posted February 27, 2010 viewtopic.php?f=9&t=18415 Link to comment Share on other sites More sharing options...
smithe1811 Posted February 27, 2010 Author Share Posted February 27, 2010 :doh: :dunce: :bowdown: Link to comment Share on other sites More sharing options...
Recommended Posts
Create an account or sign in to comment
You need to be a member in order to leave a comment
Create an account
Sign up for a new account in our community. It's easy!
Register a new accountSign in
Already have an account? Sign in here.
Sign In Now