Date: Tue, 10 Aug 2021 12:01:35 -0300
Reply-To: Roy Nicholl <RNicholl@NBNET.NB.CA>
Sender: Vanagon Mailing List <vanagon@gerry.vanagon.com>
From: Roy Nicholl <RNicholl@NBNET.NB.CA>
Subject: Re: Idle gremlins still at play
In-Reply-To: <CAFdLW6=pb==XW_j8W7fLs-CAS4PHH3zju2E23_Rz+0JrWNFP8Q@mail.gmail.com>
Content-Type: text/plain; charset=utf-8
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:Â
> https://modulemaster.com/products/vw-volkswagen-vanagon-1986-1991-idle-controller-rebuildÂ
> 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)Â Â 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
> >>>
>
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