I don't know. I have not yet pulled apart a 2.1L ISV controller. (the
pictures on the site are of a 1.9L ISV controller)

I assume there is a high(ish) current transistor that drives the ISV. If
the ISV shorts, then it could take out that transistor. This drive
transistor modulates the ISV (the buzzing). One of these days I'll put a
'scope on it to see what it does.

Anyone have a 2.1 ISV controller they want to send me for reverse
engineering? It doesn't have to work, of course.

(We have 6 or so Vanagons in the local junkyard, but they are either
aircooled, or picked completely clean. So, no local source of stuff to
reverse engineer)

Jon

On Thu, 4 Jan 2007, Steven Johnson wrote:

> I'm glad Zoltan has found the problem.  I've read here
> in the past that it was a good idea to replace the
> idle control circuit along with the ISV as they tend
> to affect each other as they degenerate.  Any input
> on this?
>
> Steven
>
> --- jon <jon@kenneke.com> wrote:
>
> >
> > I got a Pmail from Zoltan, and it was the ISV. In my
> > world, that is kind
> > of a rare failure, but a replacement solved it.
> >
> > > brand that would be able to do the job.  If the
> > > issue is not bad grounds or anything else Jon
> > listed,
> > > I'd go for cleaning the injectors.
> >
> > That's a good very good suggestion. Also, I keep a
> > known good injector
> > around to swap in. 20+ year old injectors do
> > fail/get leaky/etc.
> >
> > Jon
> >
> 0
>
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