cold start valve- part II

[Brendan/Coolian]

Here's a bit more on the CSV:
http://endosquid.com/audi/images/pics/diagtext/thumbnails/diag_csv1.jpg.html

At 01:00 PM 4/29/01 -0700, Huw Powell wrote:

> > no, i mean the cold start valve!
>
>Uh oh.  It shouldn't affect idle once the car is running, and it
>shouldn't buzz either really.  It should only be activated for a few
>seconds right at a cold start (Bentley should have graphs showing
>duration vs. temperature).
>
>I wonder if the switched ground wire is chafed somewhere?
>
> >
> > > thanx for all replies.  haven't been able to remove the valve for
> > > testing but i did check for power to the electrical plug and it was
> > > fine.  i did notice that when i unplugged it it stopped buzzing and
> > > when i plugged it back it started buzzing again. It also appeared that
> > > it had an affect on idle when i unplugged it.
> >
> > Well, for starters you are talking about the Idle Stabiliser Valve not
> > the Cold Start Valve (which is an extra injector in the intake manifold)
> >
> > the ecu regulates the idle by controlling how much air gets around the
> > throttle body, thru the ISV.  That why it buzzes.  When the engine is
> > cold it lets a lot more air in to maintain the idle.
> >
>
>--
>Huw Powell
>
>http://www.humanspeakers.com/audi/
>
>http://www.humanthoughts.org/