Re: Diff lock switch on '87 4kq

["Christopher P. Locke" <d.locke@snet.net>]

Aaron Peloquin wrote:
> 
> Last year, my diff locks worked as needed.  Earlier this year I had to tear
> apart my dash, which involved disconnecting the diff lock switch/panel.  Now
> my diff locks are not engaging.  I'm assuming (hoping) that the problem is
> with the switch/vaccuum system and not the diffs themselves.  Do I have to
> do something to "prime" the system since I had disconnected the vaccuum
> hoses?  If not, I assume I'm looking for a vaccuum leak.  Is there an easy
> way to diagnose?
> 
> TIA,
> Aaron Peloquin
> '87 4kq - awd, but not ready for snow :(

With the dash board apart (again :o(  ) and your engine running, you can
go sniffing with a can of starting fluid around your diff switch.  Give
a squirt and wait a second.  A rev in the engine indicates you've found
a vacuum leak.  Since that's the only area you've been in, likely you'll
find the leak there.

Chris Locke 86 4kcstq