Thursday, Oct 06, 2005 at 08:26
Have a friend with the same problem in a 99 3.5l.
4wd light flashes and 4wd won't engage/disengage properly.
The flashing light indicates that the system is trying or ready to engage 4wd.
But then it may be a faulty sensor :-).
Tracked it down to the 2 vacumm control switches on the inner drivers side guard in the engine bay.
Seems that the front diff has a vacuum control to engage 4wd and also another one to disengage.
Not using 4wd enough is part of the problem.
Check the hoses and clean out the switches.
He changes in and out on a regular basis each day on the way to work.
Took a few months, but everything working better now.
Quote for switches from Mitsu was about $300.00. Can't get them from the wreckers either.
FollowupID:
387445