The idle stablize is simple. A soilenoid valve. A coil of wire.
The wire can short. It can open. The valve can clog or get dirty.
THe valve can wear out. Cleaning can help. You can measure
for an open circuit. I have not found spects for shorts valve.
It is hart to find wear, being the valve is sealed.

            Eric                   86-VW4x4
            vw4x4@fyi.net          72-240z
            Pittsburgh, PA USA     1936-Chrysler

On Fri, 15 May 1998, Karl F. Bloss wrote:

> I found an old one of these under the Weekender seat while cleaning
> up and assume it's bad.  I was wondering how these things fail and if
> they can be refurbished.
>
> -Karl
>
> Karl and Kristina Bloss, Trexlertown, PA
> '87 GL Weekender  "Beverley"
> VW shop list: http://www.enter.net/~bloss/vw/vwshops
>