Date:         Sun, 20 Jan 2002 16:31:01 -0500
Reply-To:     David Beierl <dbeierl@ATTGLOBAL.NET>
Sender:       Vanagon Mailing List <vanagon@gerry.vanagon.com>
From:         David Beierl <dbeierl@ATTGLOBAL.NET>
Subject:      Re: AFM upgrade - digijet?
Comments: To: Blake Thornton <thornton@MATH.UTAH.EDU>
In-Reply-To:  <Pine.LNX.4.44.0201200920120.9282-100000@sierra.westminster
              college.edu>
Content-Type: text/plain; charset="us-ascii"; format=flowed

At 11:21 AM 1/20/2002, Blake Thornton wrote:
>So, has anyone with a digijet (83-85) vanagon, done this fix?

Lots of people.  The original VW fix was designed to cure a very specific
and not-too-common problem (though it happened to me in Scotland...) where
driving at a constant speed and throttle for some period (quite a trick in
Scotland!) would start a mechanical oscillation (possibly a resonance in
the air column?) of the AFM vane.  After a certain period the ECU would
diagnose the AFM as crazy and ignore it, at which point throttle response
goes out the window, stumble stumble limp.  Shutting the ignition off for
an instant would reset the ECU and all would be normal until next time.

However the fix also eliminates transients resulting from noisy contact in
the AFM, so it makes a general improvement on many Vanagons.

david

--
David Beierl - Providence, RI
  http://pws.prserv.net/synergy/Vanagon/
'84 Westy "Dutiful Passage"
'85 GL "Poor Relation"