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Old 12-28-2008, 12:15 PM
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4WD Actuator intermittent..is this normal??

I have a 92 YJ and on occasion the front axle will disengage while the engine is under heavy load like being in 4th gear at 45 mph. I know this sounds like a vacuum leak and it may very well be but before I go through all the trouble of locating a vacuum leak I was wondering if this is typical considering the way this was designed. It makes sense that when vacuum is low the axle can (and will) come disengaged. The dash 4WD indicator goes out simultaneous to the axle disconnecting.

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Old 12-28-2008, 01:17 PM   #2
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mine does it it only turns off the light the axle stays engaged. on hard acceleration most of your vac goes away it makes the t-case switch think its not in 4x4 but the axle uses vac to engage AND dissengage the 4x4 so even if you turned off the jeep when in 4x4 the front axle will still be engaged

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Old 12-28-2008, 01:25 PM
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I feel a thud coincident with the light extinguishing. On ice I notice a brief traction loss, enough to get a couple degrees sideways but not enough to have to correct the slide. The brevity of the disengagement of 4WD allows it to correct itself before I can even react. It is a bit unnerving though. I fear one day it will not re-engage.
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Old 12-28-2008, 01:33 PM   #4
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check the t-case switch it may be faulty
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Old 12-28-2008, 01:47 PM
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It never fails to switch into 4WD. When you are running in a lower gear at higher RPM’s it seems to be faultless. I have been off road in the snow and the damn thing is unstoppable but on the highway in wet to intermittent snow if you run in 5th gear this will happen. I have not noticed it happen when the road is snow covered but then I am usually not cruising. When It has happened I just downshifted to 4th or 3rd and the problem goes away so I have to believe it is a vacuum problem. I question whether this is normal or not. FWIW, I have a 4.0 liter and a manual transmission.
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Old 12-28-2008, 02:12 PM   #6
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actally disengeging the 4x4 is not normal i think that you vac problem may be in the t-case switch this is the part that tells the actuator to go one way or the other. either that or your vac lines are hooked up wrong. but no it coming out of 4x4 is not normal at all

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