Date: Sat, 14 Jan 2006 19:04:01 -0500
Reply-To: Dennis Haynes <dhaynes@OPTONLINE.NET>
Sender: Vanagon Mailing List <vanagon@gerry.vanagon.com>
From: Dennis Haynes <dhaynes@OPTONLINE.NET>
Subject: Re: throttle shaft bushings ?
In-Reply-To: <vanagon%2006011416432035@GERRY.VANAGON.COM>
Content-type: text/plain; charset=us-ascii
I have yet service a throttle body for worn bushings. Yes, they do wear,
especially on the automatics, but the wear has yet to be a problem. The
)2 sensor circuit and idle stabilizer will easily compensate for any
vacuum looses there. It is important that the stop crew is adjusted so
the butterfly does not close far enough to jam.
VW has redesigned the cam and switch arm. The replacement set up
activates more positively and makes adjustment easy.
Dennis
-----Original Message-----
From: Vanagon Mailing List [mailto:vanagon@gerry.vanagon.com] On Behalf
Of Roger Sisler
Sent: Saturday, January 14, 2006 4:38 PM
To: vanagon@GERRY.VANAGON.COM
Subject: Re: throttle shaft bushings ?
Just peeked in the archives about this. The proper term is "throttle
body".
About 60 hits."Throttle shaft" gets two hits. A new TB from VW costs
$565,
as of 2001.Got your attention now,I bet.
The problems with these are two fold. First, the shaft being out of
plum
from worn bushings can cause a sticking of the butterfly valve and
a "scratching" of the bore.The fix for the grooves this makes is good
ole
JB weld in the scratches of the bore.I dont have these scratches , I
dont
think,but I will now check real close.
The reason for the out of plum is worn bushings. I can see how to get to
them. Just remove the 2 torx fasteners on the butterfly valve and the
shaft
slides out.The bushings look like fuel injector o-rings(but they are not
not not).I assume the bushings can be pryed out and new ones tapped in.
Has anyone done this? Cant fine this in the archives. Worn bushings
cause
rough idle because the air is not precisely measured anymore(list
theory).I
also think it can cause my problem of not clicking off the computer at
idle
because the shaft is cockeyed ever so slightly.After all, the correct
throttle switch adjustment is just .002-.004.Dont take much shaft
tilting
to change this setting. Can you say emmission testing problems? Any
idea
where new bushings can be had? How about a carburator shop? I think the
bushings are not the same though.Maybe VW has them? Once again, I have
this
problem on both TB's that I own. One has only 62K.The other ,about
170K.Thanks,Roger.
