Ken, have a look at one and I think you'll see what I'm talking about. When
closed, the butterfly should seal to the inside of the throttle body except
where the idle air screw is located. The grooves occur where the butterfly
contacts the throttle body and tend to be more pronounced at the top and
bottom of the body.

-Mark

>From: Kenneth D Lewis <kdlewis@juno.com>
>To: transporter99@hotmail.com
>CC: vanagon@GERRY.VANAGON.com
>Subject: Re: rebuilding throttle body
>Date: Sat, 19 May 2001 13:31:34 -0400
>
>Mark;
>         I see what you are saying, I just do not understand why. The
>butterfly are almost identical are they not? The throttle body's should
>never close all the way anyway,if the idle stop is set correctly. Why
>would it wear grooves in the side?
>
>
>
>Good Luck and Drive Safely
>Ken Lewis
>86 Crewcab,60 356
>http://Neksiwel.20m.com/
>
>
>On Fri, 18 May 2001 14:51:33 "Mark McCulley" <transporter99@hotmail.com>
>writes:
> > Ken and Mark,
> >
> > The problem with the throttle body is quite different from the
> > problem with
> > worn bushings on a carburator. What typically happens with a
> > carburator is
> > the bushings on the butterfly plate shaft wear out resulting in an
> > air leak
> > and a too-lean mixture. This is easily fixed by rebushing the shaft.
> > What
> > happens on the 2.1l throttle body is the throttle plate wears
> > grooves into
> > the inside of the throttle body......................
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