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My guess would be a leak in the Vacuum Hose Hard to say without more info though I had the exact same problem with my 1993 Jeep Wrangler Sahara. I took it in to the shop repeatedly and after replacing all the vacuum hoses they still could not figure it out. I finally took matters into my own hands (literally) and bought a hand vacuum pump to test the vacuum motor myself. When I took it off it was full of gunk and would not engage fully. I cleaned it thoroughly and it has worked perfectly ever since. I used the Chilton's Jeep book for guidance, but it's pretty straight forward if you are mechanically inclined and don't mind getting dirty. You'll also have to add some transfer case oil after you reinstall the vacuum motor.

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โˆ™ 2006-11-06 18:08:23
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Q: What would cause the front axle not to engage when the transfer case is shifted into 4WD and the rear is working on a 1993 Jeep Wrangler?
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What would cause the front axel not to engage when the transfer case is shifted into 4wd and the rear is working on a jeep wrangler?

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It should engage when you shift the transfer-case onto 4-hi,or lo. It is actuated by a vacuum valve. If it isn't locking in,then you have either a vacuum leak,the diaphram(on the axle housing) is bad,or the mechanism on transfer-case is defective.

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Just shift the transfer case selector gear shift into the four wheel drive range of choice....hubs are engaged vis vacume control activated via a vacume switch located on the transfer case I think

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the front axle and transfer case for your Wrangler are vacuum actuated so you may have a vacuum leak, under the hood by your windshield washer solvent there is a black plastic cylinder with 2 vacuum hoses on top, one goes to the axle and one goes to the transfer case, one of these is most likely the problem, if the hoses are fine then you may have a bad actuator on the axle, good luck.

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Well is it actually engaging into 4WD? If so, then you do simply have a problem with the lights. However, if you don't notice the transfer case engage, you may have a problem with either the push button system or the transfer case itself.

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