Jumping in on this post with related questions.  

I have an '86 2WD with original ECU that works fine.  A year ago I
picked up one of each of the other two models (DX and D) as part of an
engine purchase deal.  I tried the D model out to see how it would
perform.  I immediately noticed a much deeper exhaust note which seemed
to suggest improved performance.  I don't recall now whether or not I
felt that performance on my subsequent test run but about 30 miles into
that run I experienced Vanagon Syndrome.  I managed to get through it by
radically altering my throttle position until it came around.  By the
way, I was able to see the impact of VS on my OXS gauge.  Pretty darn
handy.  Once I got to the camp ground I switched back to the original
ECU.  I now carry this D unit as a spare.  Has anyone else experienced a
perceived change in performance with a D model and is there any reason
why I can't try the DX unit?  I always thought it was specifically for
the Syncro but now I see here in Malcolm's post that this isn't true.

Thanks for your thoughts.

Jeff Warner
Galloway, OH
'86 Wolfy Westy "Barry" 

Date:    Wed, 9 Nov 2005 19:07:17 -0800
From:    Malcolm Stebbins <mwstebbins@YAHOO.COM>
Subject: ECU:   022D vs 022X vs 022DX ??

I have done my homework and search the vanagon archives AND the yahoo
syncro lists for the
differences in ECUs  I have found different ones.

What is the DEFINITIVE answer to this??   Malcolm

BusDepot lists:

Vanagon (2.1 Liter) (1986 - 1992)
Vanagon Syncro (1986 - 1992)

http://www.bus-boys.com/bb13386.htm#4

025-906-022X 1986-1987 2WD
025-906-022DX 1988-1991 2WD, 1986-1991 Syncro
025-906-022D New ECU 86-91 All Models  NLA