car won't idle...

[Richard van der Hoff]

<sigh>

well, I finally got time to take another look at my PITA ISV.  Still no
joy...

In message <3D2CDA1D.50BA3768 at attbi.com>
          Huw Powell <human747 at attbi.com> wrote:

>
> > A couple of questions then:  first, I assume that the [ISV} valve *is* supposed
> > to close (rather than open) when current passes through it?  and assuming
> > it is, any idea why the ecu has decided I don't need any air in my engine?
>
> try running the current the other way, maybe it will open.

No - it still closes :-(

> one thing is, that a rapid "close then release" will also result in a
> wider opening as it overshoots...

Hmm; possibly.  It certainly *looks* very closed (and gives a very audible
click as it changes).

> how is your idle switch?  that being closed is the only way your ECU
> knows that it has to manage the idle speed.

Good, as far as I can see.  checks out fine with an ohmmeter, and
disconnecting it (presumably equivalent to opening it) makes the engine
rev.

Guess I'd better give the Audi dealership a ring tomorrow.  Oh well;
thanks all for your help - I'll let you know how it turns out.

Rich