Question about Cars & Trucks
The vacuum actuator moves piston to 2wd position , but will not return to 4hd position on its own, but will with manual assistance. Does this indicate the spring is defective in the actuator?
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Posted on Jan 02, 2017
SOURCE: My 01 Trooper had problems
We have a 1998 Trooper that had the same problem. The fix was an electronic switch for the 4WD - a vacuum sensor - on the front axle that just plugs in. You can see it - if you look under the car from the front, it's mounted in the middle of the front axle. It cost $175 from the dealer. We had somebody install it for $50. Don't know where you live, but they are exposed and can corrode. That's what happened to ours. Good luck - hope it's the same problem. This was an easy fix, and we were pleased.
Posted on Jan 16, 2009
If its not engaging into 4 WD the vaccum actulator is more than likely stuck. The actulator is located on the front of the axle next to the the front gear hub it will have a plastic cover over it. Unbolt the two 10mm bolts that hold the cover on and spray down with WD-40, also pull back the rubber cover thats on the actulator staff and spray it. You might have to hit the staff a few times to get it to move just make sure its in 4WD. I had the same problem, that part is exposed to alot of water, snow, salt and so on. Or you could just replace it but its cheaper to spray it down with WD-40
Posted on Apr 18, 2009
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