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Subject:Re: AFM track cleaning wisdom
From:Jake de Villiers
Date:Thu, 12 Aug 2010 19:12:15 -0700

"Scottish Pounds"?!

I don't think so...

On Thu, Aug 12, 2010 at 8:51 AM, David Beierl <dbeierl@attglobal.net> wrote:

> At 08:44 AM 8/12/2010 Thursday, Mike \"Rocket J Squirrel\" wrote:
>
>> Whaaaa..?
>>
>> Sez who?
>>
>
> The term "Vanagon Syndrome" has been rather corrupted.  The original
> tech note from VW referred to a resonance effect under certain
> conditions of steady throttle and load that could trigger an ECU
> error mode.  The fix was an active circuit inserted into the AFM line
> that limited maximum rate-of-change of the AFM signal.
>
> This tech note was later extended to the 1.9l -- and indeed, I once
> experienced the genuine article on a long straight road in Scotland
> in '91, when my total mileage behind the wheel of a Vanagon was oh
> say 500 or so.  It was in the '84 Westy that later became Dutiful
> Passage.  A couple hundred miles earlier I'd experienced full-on 3-4
> synchro hub failure, so you can see I was richly blessed.  And so I
> was, with a sister (the then owner) who paid three thousand Scottish
> pounds at the dealer for a transmission swap.
>
> After a while VW quit giving out the little harness for free and
> started charging serious money for it, and some bright spark thought
> "I bet a few microfarads in the right place would do the job just as
> well," and so it was.
>
> But the law of unintended consequences came into play -- since either
> device limited maximum rate of change of the signal, it would largely
> cover up for little dropouts caused by track wear in the AFM.  For
> once this was a good thing.
>
> Thus saith the Lord.
>
> Yours,
> David
>

--
Jake

1984 Vanagon GL 1.9 WBX 'The Grey Van'
1986 Westy Weekender/2.5 SOHC Suby 'Dixie'

Crescent Beach, BC

www.thebassspa.com
www.crescentbeachguitar.com
http://subyjake.googlepages.com/mydixiedarlin%27