If the switch is toasted most likely the connectors for the switch and the
auxiliary air regulator were swapped. Easy check! Get your voltmeter and
check the two connectors. With the engine running the 12 volt connector goes
to the auxiliary air regulator and the 5 volt does to the throttle switch.
Connecting the 12 regulator source to the switch will instantly fry the
switch. The fact that you had the surging idle with the switch disconnected
tells me the switch connector was seeing the heater in the air regulator.

Dennis

-----Original Message-----
From: Vanagon Mailing List [mailto:vanagon@gerry.vanagon.com] On Behalf Of
Dave Creasy
Sent: Monday, June 01, 2009 8:41 PM
To: vanagon@GERRY.VANAGON.COM
Subject: Throttle Valve switch

Just got done installing new heads on my '85 1.9l and after start-up, I'm
getting the surging idle.  Took off the Throttle valve assy. and that little
bugger of a micro switch is dead.  Considering the cost, I would expect that
thing to last a lot longer.

    My query is this.  Has anyone ever spliced in a real switch such as
Micro, Omron, Cherry ??? If so, what are the results and the fudge factor to
install.  Dave ( ready to go kayaking when the Westy runs ) Creasy

'85 Westy, #%$&#$%
'93 EVMV 5 sp.
'98 Beetle, Lipstick