Volks,

There are two or maybe three Idle Stabilizer Control units for 1.9l WBX
vanagons.  Bentley, p. 24.19, states that model 251 906 083, green, is
for 83-85 models in Californian and Canada and for the 49 states for
83-84.  It also states that  model 321 906 083, black, is for the 49
states for 85 models.

There is also a tan 251 906 083A available.  It replace the green one on
my 84 and cured all my mysterious FI lurching cutoff problems that had
plagued my van for years before I found the list several years ago.  At
least one list vendor indicates that this model is good for all 1.9l
Digijet systems.

I recently acquired my 3rd running vanagon, an 85 Westy Weekender, and
suspect that the Idle Stabilizer Unit, a black 321 906 083 model is
bad.  Van sure has operated better and lurching has almost stopped with
it removed and plugs connected.  About three weeks of running this way.
(But van had been sitting quite a while and it may just be getting
cleaned out of gunk.)

Can I run this 85 van with the tan 251 906 083A that  is in my 84 if the
black unit is bad. I plan to put the black one back tomorrow and see if
the symptoms reappear.

What is the difference between these units?  Anything significant?

Sam Walters
Baltimore
89 Syncro GL
84 Vanagon, original owner
85 Westy Weekender, new van to me, 9k miles on new engine, first camper
parts van and too many other parts in a garage