I had a problem similar to what you describe in my '80 Westy.  Ran fine when
cold, then faster (up to 4000 rpm) when warm.  Had a mechanic look at it and
he found that when we disconnected the D-valve (part of the vacuum system),
the idle remained low.  Wish I could tell you more about it but since I
punted on this one that's all i know.  Oh, the D-valve is located at the
front, passenger side of the engine compartment, looking down on the engine
from the hatch.

Peter

'80 Westy "Penny" 130k
'85 Audi Quattro - 180k just traded :(
'89 Nissan 4wd truck 135k, no name
'93 Mitsubishi Montero 50k "the Sub"

>Date: Sun, 27 Apr 1997 12:56:06 -0700
>From: "David L. Chasteen" <dchaz@gte.net>
>To: Vanagon E-mail group <vanagon@lenti>
>Subject: Bad Temp Sensor?
>Message-ID: <3363AF56.3767@gte.net>
>
>My 82 Westy has developed a strange problem that I hope some of ya'll
>can help me with.  When the engine is cold, it starts and drives OK. 
>But as it warms up (either the weather or the engine) it begins to run
>faster and richer until it just begins to dump gas into the cylinders. 
>It begins to smoke and runs really rough.  I believe that it is some
>sort of temperature sensor that is going (or has gone) bad. 
>Unfortunately, I dont have a Bentley book yet and I dont know where the
>sensor is and how I can check it.  I have checked all the connectors off
>of the pig-tail and with the exception of taping up a few breaks in the
>insulation, there seems to be no broken or disconnected wires.  Can
>anyone give me some insight or instructions?
>Thanks, Chaz

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