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On 1994 Jeep Wrangler YJ why is front axle shift motor not engaging?
Wiki User
∙ 16y ago
The front axle shift motor will not engage if:
A. No power / bag grounding
or the more likely failure is
B. No Vacuum (4wd will not engage unless vacuum line going to the module is working properly) check/replace vacuum hose
Wiki User
∙ 16y ago
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What causes the front hubs on a 89 jeep wrangler to lock in?
There is a shift fork that is engaged using vacuum from the motor. The shift fork is located inside the front axle more towards the passenger side. When you engage four wheel drive it lets the vacuum go down to a motor that moves the fork to lock the hubs
Why on 1994 Jeep Wrangler YJ front axle shift motor not engaging and what to do about it?
There could be many reasons, but you should start with this simple test that requires two people. 1. Start the vehicle. 2. Set the emergency brake and put the transmission in PARK (for automatics) or NEUTRAL (for manuals). 3. Remove the vacuum plugs from the shift motor. You should be able to feel vacuum suction from one of the holes. 4. Put the transfer case into 4WD. The vacuum suction should switch to the other hole. If it doesn't, then you have a vacuum leak somewhere. Check the lines for a leak. If suction does switch to the other hole, then the problem lies within the shift motor. The shift motor is a *very* simple mechanism so it's unlikely some is broken inside. More than likely it will be "gummed up" from old oil or any number of reasons. Remove it (4 small bolts) and clean it up, but before you re-install it, connect the vacuum lines to it and shift the transfer case in and out of 4WD to see that the forks slide left and right. www.wrangleryj.com is a site dedicated only to the 1987-95 Jeep Wrangler YJ.
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