I had the same 2000 rpm problem, and it was a bad idle control unit in my
case.  Check that your idle control valve is humming, and then find an ICU
to borrow, they are expensive.  If it fixes it find a used one if you can (I
found one for $75.)  If not, GW has rebuilt ones:
http://www.gowesty.com/ec_view_details.php?id=23468&category_id=&category_pa
rent_id=

Stuart

-----Original Message-----
From: Vanagon Mailing List [mailto:vanagon@gerry.vanagon.com] On Behalf Of
Van Pelt, Steve
Sent: Thursday, January 15, 2015 9:03 AM
To: vanagon@GERRY.VANAGON.COM
Subject: 2.1WBX running rich

Hi all,

My water boxer motor is running slightly rich, or at least I feel like it is
since I don't have a smog meter. I have done all the usual checks such as
disconnecting temperature two sensor, disconnecting the oxygen sensor,
checking with a can of carb cleaner to see if idle changes when I spray
around the intake manifold hoses. New air cleaner installed.
The idle also is kind of an issue, in the sense that it will idle at about
1000 and hunt between 1000 and 1200 RPM. That is with the idle screw on the
manifold screwed all the way in tight. If I backed the screw out, it runs up
\ to 2000 rpm quickly.

Any other thoughts on what to look out for?

Thanks,

Steve