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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 ?
Comments: To: Roger Sisler <rogersisler2000@YAHOO.COM>
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.


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