Larry;
A word of caution to everyone about this. I believe the ABV is exactly
calibrated at the factory so this procedure should only be used if you
are certain the ABV is the problem. DO NOT go experimenting with the
setting or you can get in BIG trouble. You may actually THINK you have
fixed a problem but actually just masked another problem. Then a few
month later the temperature changes and the engine acts real weird or
maybe you fail HC inspection, etc. So determine the ABV is the problem by
eliminating everything else or by substituting it with a known good unit.
Knowledge can be a dangerous thing.
Drive Safely & Good Luck
Ken Lewis<Kernersville,NC>86 VW crewcab;60 T-5 Coupe

On Mon, 26 Oct 1998 15:14:44 -0500 Lawrence Johnson
<ljohnson@halhinet.on.ca> writes:
>Thank you...Thank you...Thank you...Kenneth Lewis
>
>This hitherto totally undocumented cure to the surging idle problem
>belongs
>right up there with the famous capacitor fix to the dreaded Vanagon
>Syndrome.
>For those who don't know what I'm talking about here is an excerpt of
>Ken's
>missive:
>
>> The Air Bypass Valve is adjustable but nowhere will you find a
>procedure. I
>> experimented with it trying to (unsuccessfully) fix high HC output.
>I
>> produced a very similar symptom as yours. (idle speed going up and
>down in
>> a regular fashion every couple of seconds) To access the (Idle
>Stabilizer
>> Valve) adjustment unplug the electrical connector and remove a 2mm
>allen
>> set
>> screw from the center. Now reconnect the plug and pull back the
>rubber
>> boot. The adjustment is accessible, while the engine is running,
>with a
>> 2.5mm allen between the two wires. Turn the allen CCW to raise the
>idle, CW
>> to lower.
>
>We haven't found a VW mechanic within all of southern Ontario that
>knew how
>to fix this problem. The standard mantra was get a new Idle Stabilizer
>Control Unit or Idle Stabilizer Valve or both.
>
>IMHO This procedure should be written up in entirety and put into a
>special
>spot in the archives.
>Larry
>'86 Syncro Westfalia
>
>
>

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