Date:         Tue, 7 Dec 1999 18:39:04 -0800
Reply-To:     daveb@CP.NET
Sender:       Vanagon Mailing List <vanagon@gerry.vanagon.com>
From:         Dave Bayer <daveb@CP.NET>
Subject:      Re: Trottle body switch- What is it for?
Comments: To: Sorin Bejenaru <CaliforniaCampers@COMPUSERVE.COM>
Content-Type: text/plain; charset=us-ascii

Sorin Bejenaru wrote:
>
> I have a 1990 Vanagon that was cutting off a lot jerking the whole van from
> time to time.  After playing with the computer, air flow meter and the
> ground wires I gave up and took it to the mechanic.  They disconected the
> trottle body switch and it now works fine, but they did not know what the
> purpose of the switch is.

        The switch is used to signal closed and full throttle
to the computer. It allows the engine to go into open loop when
you floor it (if I remember correctly). It allows the ECU
to control fuel shutoff on deceleration. And signals the computer as
to when you are trying to idle (this lastbit is a detection from the
fact that the van will be jerky if you have the switch adjusted so that
the closed throttle switch point is out of spec)...

dave