I can't tell you about how the idle stabilizer valve should hum.  Mine has
worked intermittently and I've never (4 years) heard it hum.
Re: temp II Sensor, I recently did this too.  Wait till the engine is cool
(don't want to open the cooling system while it's pressurized)  put a pan
under thermo housing to catch a little coolant, and basically set everyting
up to work  FAST.  Pop out the old sensor, transfer the O ring, pop in the
new sensor.  If you lose a cup of coolant, your slow!!

I think that we all have that extra arm on the throttle.  Though I don't
have it, I always assumed that this was where a cruise control unit would
connect to the throttle. If you don't have CC either, ignore it.

Gary
----- Original Message -----
From: James A. Creech <jacreech@VISUALLINK.COM>
To: <vanagon@GERRY.VANAGON.COM>
Sent: Monday, November 13, 2000 6:56 PM
Subject: fuel system questions

> Thanks to Joel Walker, Terry Kay, Bill Davidson, Matthew Pollard, Jay
> Snyder (pardon if I'm missing someone) for great help on my cold start
> problem.  I'm underway with your advice and making some progress.
>
> If you or any other listmembers have some insight and time to respond a
bit
> further, I'd greatly appreciate your kindness for that as well:
>
> (1) I cannot discern any vibration or hum in my idle stabilizer valve, but
> don't know whether to attribute that to a bad valve or too much rock &
roll
> guitar in past years, or too much engine sound.  How noticeable would this
> be the vibes and hum in a healthy valve, not my deafness and loss of
touch)?
>
> (2)  I assume replacement of the temp 2 sensor at the thermostat housing
> requires a complete coolant system drain.  Any shortcuts here (like
quickly
> & temporarily stopping up the sensor hole with something during the switch
> to new sensor?)
>
> (3)  On the throttle valve unit, there's a smaller arm and spring on top
of
> the rotating arm attached to the accelerator cable.  What does it do?
Mine
> is sticky, doesn't rotate easily - basically stays wherever I put it by
> hand, even with throttle movement (acceleration).  How is it supposed to
> operate, and be adjusted?  Bentley has an adj. shown on 24.59 but I can't
> decipher it.
>
> Thanks again,
> Jim Creech
> 87 Westy GL 2.1
>