Virginia Posted January 16, 2018 Share Posted January 16, 2018 The black vacuum lines under the truck that give me 4 wheel drive fell against the exhaust system and melted. How hard is that to replace and how do I know what connects to what? Link to comment Share on other sites More sharing options...
Pete M Posted January 16, 2018 Share Posted January 16, 2018 it is easy to do away with the lines and get reliable 4wd again: Link to comment Share on other sites More sharing options...
Green Mesa XJ Posted January 16, 2018 Share Posted January 16, 2018 Are you talking about the vacuum harness or the lines going to the CAD?Vacuum harness is available aftermarket that should fit 84-91 according to the description. Although I seem to remember our 91 XJ was an odd year hard to find at the dealer part. If it the lines going to the CAD some vacuum line from the parts store will do the job nicely, I can probably find a diagram or get a picture of my 85 XJs lines if you need it. Eliminating the need for the harness and plugging the line is another solution . Sent from my iPhone using Tapatalk Pro Link to comment Share on other sites More sharing options...
yxmj Posted January 16, 2018 Share Posted January 16, 2018 You can easily splice them together if you have chunks of the "hard" vac line....just sleeve it over with rubber tube......make sure your solid line is touching with no gaps. To figure out what goes were....with the truck running have a helper pull on the 4x4 lever while you put your finger over the end of the hose....the one that makes vac when the lever is pulled goes on the drivers side of the actuator pod.....the other goes on the passenger Link to comment Share on other sites More sharing options...
cruiser54 Posted January 17, 2018 Share Posted January 17, 2018 Ditch all that crap per Pete's suggestion. Link to comment Share on other sites More sharing options...
coolwind57 Posted January 17, 2018 Share Posted January 17, 2018 Now that I have snow, I was anxious to give my 4wd a workout. Uh-oh. Houston, we have a problem. It was about 0-degrees F. I placed my shifter into both 4wd High and Low and got some very disturbing sounds. Sounded like some popping and cracking and clanging. It did seem to engage, but made this noise that immediately alarmed me. I tried 3-4 times and got the same result. One of those times, I couldn't get the shifter to physically come out of 4wd at all. It took a lot of messing around, shutting engine off and restarting and fiddling with lever to get it back to 2wd. I'd run this 4wd at least a Month or two ago and had absolutely no problems. As many of you know, I'm pretty new to MJs so now I get the pleasure of finding out about the CAD system and how it works (and doesn't). Not yet sure if my issue is CAD just yet, as I'm locking inside till my bronchitis clears but I already see a single axle swap in my future. Just sucks that my 4x4 system let me down during the exactly climate conditions in which I bragged that the truck would absolutely excel in. Link to comment Share on other sites More sharing options...
Pete M Posted January 17, 2018 Share Posted January 17, 2018 and that is why the CAD bypass should be mandatory for MJ/XJ/YJ Jeep owners! (although those noises could still be something with your t-case or shifter) Link to comment Share on other sites More sharing options...
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