Another thought:

I have noticed that some of the hoses that come off of the Idle valve into
the plenum have an additional, very small hose connection to them. Others
are without.

What's the difference in applications?

Kim

----- Original Message -----
From: "John Bange" <jbange@GMAIL.COM>
To: <vanagon@GERRY.VANAGON.COM>
Sent: Saturday, August 16, 2008 5:07 PM
Subject: Re: Idle Relay - Idle Valve match?

> > This begs the question, as there were different series' of relays and
valves
> > and ECUs: Are there certain sets that were designed to go together?
>
> For the 2.1 Digifant in NA, there's just the B revision and D revision
> idle control module, and the only difference is the D revision is less
> likely to crap out. ECUs for the NA market are likewise essentially
> work-alikes, and really don't come into play anyway, as the idle
> control system is completely independent of the ECU--- all it does is
> watch RPM and allow more or less bypass air via the valve. Surging
> idle with AC sounds like a bad idle controller, as it's the only thing
> that's watching the compressor. A bad valve would more likely give you
> a bad idle all the time.
>
>
> --
> John Bange
> '90 Vanagon - "Lastwagen"
> '90 Vanagon GL - "Wiesel"
>