> what is the deal with "D" type ecu and idle control unit?? does this
> really
> make a difference especially in an 87 van?
>
>
For the ECU, I believe the D revision has a few software tweaks, but nothing
that'd make it worth the expense of upgrading from an earlier model. Someone
with more detailed ECU knowledge than I should probably verify my
supposition...
For the Idle Controller, you DEFINITELY want the D revision. The first
version, revision B*, proved to have less than stellar longevity, and seems
to be the primary culprit in giving the Idle Controller its reputation for
failure. VDO redesigned it slightly for the D revision, replacing a few key
parts with heavier-duty versions.

* Revisions A and B were the first generation models for the European and
North American markets, respectively. C and D were the  second generation
Euro and NA units. Not sure why the Euro and NA Digifant T3's required
different Idle Controllers.

--
John Bange
'90 Vanagon - "Geldsauger"