Date:         Mon, 30 Jun 1997 22:16:33 -0700
Sender:       Vanagon Mailing List <vanagon@vanagon.com>
From:         mholser@Adobe.COM (Malcolm Holser)
Subject:      Re: Vanagon puzzlier

> So I'm standing there scratching my head, when I have one of those
> miraculous revelations, and go straight to the problem!  On the
> throttle, the top little switch!  Clicks (on or off?) when you open the
> throttle.  Disconnect and the problem goes away!
> 
> So I run down to the local inspection guy, but he's booked for the rest
> of the afternoon.  Try tomorrow.
> 
> QUESTIONS:  What is this thing?  Do I need it?
> 
> And it starts everytime (so far!)
> 
The full-throttle switch cuts out the closed-loop circuit from the FI
system.  At full throttle, your engine runs solely on the air-flow
sensor and rpm.  If disconnecting this helps, it probably means that the
switch is shorted *and* you have a bad air-flow box.  The O2 sensor,
the main part of closed-loop operation, can do wonders in correcting
the mixture, but generally makes too lean a mixture for full-throttle.
The air-flow box is pretty easy to temporarily fix, and rebuilt ones 
are not too bad in price.

malcolm