I had the same question yesterday.  I contacted Peter about it. I also asked
what the hose fittings on the throttle body are used for.  His reply follows
(also note problem with ignition control units!):

>Hi Bill,
>
>You do not need to hook those up on the new engine. The brass fittings on
>the throttle body are a de-icing feature for extreme cold weather
>conditions. Coolant runs though the body.
>
>I am having problems with the ICU's we sent out made by Meyle Germany. If
>you have this brand, I will need it back and I will send out a replacement.
>
>Best Rgds,
>
>Peter

So there you have it.... We don't hook it up!  This weekend, I'm going to
try to figure out how to connect it, because I'm sure my state requires the
charcoal cannister to be functional.  If anyone has solved this, please
post!

Bill Knight

-----Original Message-----
From: Vanagon Mailing List [mailto:vanagon@gerry.vanagon.com]On Behalf
Of Damian Shaw
Sent: Friday, August 10, 2001 1:21 PM
To: vanagon@GERRY.VANAGON.COM
Subject: tiico question

For all/any of you that have done this conversion:  What do you do with
the vacuum lines that run to the charcoal canister?  (they come through
the firewall on the right side - one is white and one is purple).  This
setup may be unique to the 2.1 waterboxer - not sure.

Thanks;

Damian