Over the years & miles (256,000) I had my 89 that switch failed several times.
It always stuck in the engaged position. I would think that if it stuck 1/2 way
allowing vacumm to both sides the next time you engaged 4wd it would move it ot
the engage position.
Dave Clement
99 SLT+ CC 4x4
In article <42D87C59.1070002@aol.com>, SilverEightynine@aol.com (Terrible Tom)
writes:
>
>
> Well I have made good progress with Christine... but I have lots left to
> do. I find myself trouble shooting a vaccum problem with the front axle
> CAD (central axle disconnect). It seems I have 20 inch lbs of vaccum on
> BOTH lines going to the CAD. Um - thats not right heh. One line should
> feed vaccum at any given time. One for engagement and the other for
> disengagement of the axle. When I appled vaccum (with a vaccum pump) to
> only the outboard port - the CAD engaged the 4x4 light inside came on,
> and the axle locked together. having Vaccum at both lines will cause
> the CAD to not do anything at all. I checked the hose connections and
> they all seem good and in the correct order. My question is this - if
> the vaccum switch in the transfercase is bad - which is supposed to
> switch the vaccum over when the transfercase lever is engaged, will
> thise cause vaccum on both lines?? Is it possible for that switch to
> fail in a way where that will happen?
>
> The truck does have a few issues also which I will be unable to cure any
> time soon heh. The engine seems to be on its last legs - its burning
> oil and the timing chain rattles. Yummy. Not to mention the rotting
> rocker panels and floor pan.
>
> --
>
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