High idle as you described usually comes down to these problems. Incorrect
settings, bad idle speed controller or valve, weak O2 sensor signal.
The idle speed controller shares the temp 2 sensor. A bad connection or
ground can make the speed controller think the engine is cold and raise the
idle speed.

If the problem started with the cooler weather I would look at the O2 sensor
first and check the basic settings including ignition timing.

Dennis

-----Original Message-----
From: Vanagon Mailing List [mailto:vanagon@gerry.vanagon.com] On Behalf Of
Robert Fisher
Sent: Thursday, November 19, 2009 6:37 PM
To: vanagon@GERRY.VANAGON.COM
Subject: '87 GL high idle problem

Well I'm going out with my trusty multimeter and Bentley to try to figure
out what the problem is. Actually, I know what the problem is; I'm looking
for the cause. Idles @ roughly 1200 on start-up, then idles around 2200 when
fully warmed up. Any tips, tricks, suggestions or good-luck belly rubs on
your local idol will be appreciated. : )

Cya,

Robert