John--

Sound like you have a digital idle stabilizer confused with the Auxiliary
Air Regulator. The AAR is part of the warm-up enrichment circuit, and works
as Kirk described.

G. Matthew Bulley
Bulley-Hewlett & Associates
www.bulley-hewlett.com
Cary, NC USA
888.468.4880 tollfree

-----Original Message-----
From:   Johan Nyberg [SMTP:johan.nyberg@ABC.SE]
Sent:   Thursday, June 24, 1999 5:15 PM
To:     vanagon@GERRY.VANAGON.COM
Subject:        Re: AAR auxillary air regulator

Karl, and all.

My understanding is that the actual valve doesn't react to temperature
changes, nor does the control electronics. I do believe that the system
monitors the idle RPM -- idle condition being defined by the idle position
switch -- and adjusts the valve's pulsing to compensate for either a cold
engine or an actual load on the engine while idling. (I use this to help me
get going when traction is bad, on ice or wet grass etc.)

I think the problem is a non working control circuit. I've replaced and
repaired / upgraded at least four of theese in the last two years, and am
usually able to diagnose and remedy the problem in fifteen minutes plus
another fifteen to fix the broken control box.

The control box lives inside the right hand tail light assembly, and is
black, about the size of a pack of cigarettes and has ten connector spades
in the bottom. VW P/N is 251 907 393A or C, at least here in Sweden. On
demand I will repost a description of how to repair/ upgrade this one.

  ************************************************************
    Johan Nyberg, Sweden N 59o E 17o 25"
   '86 Caravelle C
    1Co 13:12
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