Dan:

That's the manner in which most of our diesels operate.

Dan N wrote on 2021.08.10 11:59:
> The idea of giving a little gas when you start a cold WBX engine
> (without dle controller) was from my observations on my ML430 SUV.
> When I start it cold the idle speeds up to about 1500 rpm for a couple
> seconds then going down gradually to 1200, 1000, 800 and and stops at
> 550 rpm all in a lapse of about 30 to 45 seconds. I asked my mechanic
> about it and he said /"Mercedes has not used an idle control valve
> since around 1990. The idle is controlled by the throttle valve
> actuator and timing via a sensor... If you start your cold engine and
> it idles right away at 550 it will stall and die and something is
> wrong with the sensor.//"/
> /
> /
> dan
>
> On Tue, Aug 10, 2021 at 4:06 AM Roy Nicholl <RNicholl@nbnet.nb.ca
> <mailto:RNicholl@nbnet.nb.ca>> wrote:
>
>     Jeff:
>
>     My son and I did a test week in Fundy (~400km in total) with the ICV
>     disconnected.�  Occasionally, the WBX stalls at idle - mostly when
>     cold,
>     so as Dan said, put your foot in it a little for a minute and all is
>     well.�  The only other time it stalls is when there is a load on the
>     alternator (running lights on) or the helm is hard over (power
>     steering
>     pump loaded) at idle ... it does not compensate (I presume the ICU
>     is at
>     play ... or asleep ... here).
>
>     Fuel consumption may be a little higher typical ... but there could be
>     other bits a play there.
>
>     Since driving with the ICV unplugged seems to be tampering the wild
>     behaviour of the idle control unit, I am going to try waiting until I
>     put the Hyena into hibernation to send the ICU off for rebuild.
>
>     Roy
>
>     Jeff Palmer wrote on 2021.07.27 17:57:
>     > Hi Roy. I have had the same issue - surge then idle then surge -
>     for a couple of years now. When I drive and not moving it idles
>     nicely at 900. Maybe you can wait to send it out until you park it
>     this winter? Assuming you don’t drive it right now. Maybe I’ll
>     send mine with you - I’m in St Andrew’s NB for holiday. (No van).
>     > Jeff
>     >
>     > Sent from my iPhone
>     >
>     >> On Jul 27, 2021, at 2:57 PM, Roy Nicholl <RNicholl@nbnet.nb.ca
>     <mailto:RNicholl@nbnet.nb.ca>> wrote:
>     >>
>     >> Stuart:
>     >>
>     >> That's interesting.�  Though being dead-in-the-water for a
>     couple of
>     >> weeks or more (I am in Canada) is discouraging.
>     >>
>     >> Thank-you,
>     >>
>     >> Roy
>     >>
>     >>
>     >> stuartmacm@gmail.com <mailto:stuartmacm@gmail.com> wrote on
>     2021.07.27 14:40:
>     >>> Idle control unit.�  Have it rebuilt:�
>     https://modulemaster.com/products/vw-volkswagen-vanagon-1986-1991-idle-controller-rebuild�
>     After 30+ years in a wet environment they all fail.
>     >>>
>     >>> Stuart
>     >>>
>     >>> -----Original Message-----
>     >>> From: Vanagon Mailing List <vanagon@gerry.vanagon.com
>     <mailto:vanagon@gerry.vanagon.com>> On Behalf Of Roy Nicholl
>     >>> Sent: Tuesday, July 27, 2021 10:25 AM
>     >>> To: vanagon@GERRY.VANAGON.COM <mailto:vanagon@GERRY.VANAGON.COM>
>     >>> Subject: Idle gremlins still at play
>     >>>
>     >>> Good day all,
>     >>>
>     >>> The Hyena (88 Westy WBX)�  � started racing at idle (from 1100
>     climbing to
>     >>> 2500 last summer).�  � If you were at the back of the van and
>     pushed the throttle hard closed - sometimes wiggling it - the van
>     would fall back into an idle.�  �  � With the engine shutdown, you
>     had to do the same to hear the click of the TPS.
>     >>>
>     >>> This morning, I replaced the throttle body with a new GoWesty
>     unit.�  Things were fine for the first test run.�  � After lunch, I
>     restarted the van and it began surging at idle, but differently
>     than before.�  � The WBX will surge to 2200 - 2500 RPM, but after
>     1-2 seconds falls back to idle.�  � Rinse and repeat.
>     >>>
>     >>> I unplugged the 12v from the idle control valve and the engine
>     remained at idle.�  �  � I removed the idle control valve; cleaned it
>     with carb cleaner and tested it with 12v leads (valve appears to
>     move).�  � I re-installed the valve and the same thing happens.
>     >>>
>     >>> So, is it possible the spring is too weak and the valve is bad
>     ... or is my problem likely to be elsewhere (i.e. idle control
>     unit) and more expensive?
>     >>>
>     >>> What's the impact of running with the power to the idle
>     control valve disconnected while I await a new one?
>     >>>
>     >>> Roy
>     >>>
>