All wheel drive does not engage

[Robert Deis]

On Tue, 5 Mar 2002, Eyvind Spangen wrote:

> >Has anyone else experienced this problem, and did
> >it turn out to be a vacuum problem?

The diff locks will fail to engage for 1 of three reasons:

1> Switch contacts are dirty, so they're never commanded to lock. Test the
switch. Solution is clean or replace the switch.


2> Vacuum leak between the solenoid valve that's operated by the switch
and the lock itself. Test for vacuum at the differential locks. Solution
is fix the leak.

3> If you've got vacuum at the differential, the lock is broken. Expensive
problem.

When mine failed the problem was dirty contacts- trivial fix.

--
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  Rob Deis                  "Let the people know beforehand what the law
  MiB3347                      is and what they are to expect."
  rdeis at io.com                              -- 18th Congress, Rec. 75