I would suggest that you trade out your Idle Stabilizer Valve with a "known
good" one BEFORE you put a new or new/used Control Unit in for testing.

The guys at the BOSCH shop here tell me that if the valve is sticking, it
can create a situation where the delicate electronics of that Control Unit
get fried.

That mechanic, who knows his ECU stuff pretty good, says taht he will not
replace either/or for a customer... if they come in and want him to service
it, he replaces BOTH components with NEW parts.

Apparently the "D" unit is built a bit stronger to withstand the stresses
made by A/C and Power Steering.... Extras that were not readily available
when the Digifant was first being produced (tested) in Europe. But a stuck
valve can kill either a "B" or a "D".

Of course, this can be extreme... as in extremely large quantities of cash
heading out of your wallet... but it is some interesting info.

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

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

----snipped---
I replaced the breather hose and the idle stabilizer control module (with
the "D" version) in my '87 Westy.
----end snipped----