Most shops will not replace the ISV alone... nor the ISCU alone.  If either
component is faulty, it will kill the other one.

Generally though, it is a clogged ISV which makes components on the ISCU
give out. There are transistors, and voltage regulators etc, which are very
sensitive.

The ISCU is a bear to troublehoot and repair... but the suggestions that
Germain made are what you should try.

There is a ton of ISCU info in the archives.  Hopefully someone on the list
will eventually start making them from scratch in their basements and giving
them to list members for free... that would be cool!

Good luck,

RSF

IMPORTANT!!! In order to reply to me, you must have the word "FISH"
somewhere in the subject line of the email.  Otherwise it goes directly in
the trash.

<�)))>{   <�)))>{   <�)))>{   <�)))>{   <�)))>{   <�)))>{

Robert S. Fish
Salzburg, Austria
1987 Wolfsburg Vanagon 2.1 GL Weekender
1987 Golf Cabriolet
1991 Golf

----- Original Message -----
From: "Pat Callaghan" <patcal096@COMCAST.NET>
To: <vanagon@GERRY.VANAGON.COM>
Sent: Tuesday, September 16, 2003 9:36 PM
Subject: Idle Control Unit (not valve)

> Hi all,
>
>      About 10 months ago, I replaced my ICU.  Now all of a sudden, my bus
is
> showing the same symptoms as before I replaced it.  Stalling when cold & I
> push the clutch in, will not pause at 1200RPM but dumps down to 500RPM or
> less.  If it is bad again, what could cause this to fail this soon?  I
still
> have my old one.  I was going to try & fix it but never got around to it.
> Any ideas?  Thanks.
>
> Pat Callaghan Jr.
> 87 Westy GL
> 90 626 LX
> Portland,OR.
> http://home.comcast.net/~patcal096
>