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Date:         Thu, 8 Jul 2010 08:04:36 -0700
Reply-To:     Evan Mac Donald <evanm@ATT.NET>
Sender:       Vanagon Mailing List <vanagon@gerry.vanagon.com>
From:         Evan Mac Donald <evanm@ATT.NET>
Subject:      Re: engine revving at idle
In-Reply-To:  <AANLkTikmto73QnEwn-MD3JMFZcCFddYglQkovWcgSedC@mail.gmail.com>
Content-Type: text/plain; charset=iso-8859-1

My '85 had this same sort of problem this spring. After messing with everything, lubing everything, and not finding the cause, I went internal. Yes, my beast is starting to suffer from the dreaded throttle plate / bore wear syndrome. The problem got slightly better after driving it for about two days, (after being put up for the winter) but the idle is not consistent, and there is still a surge at very low throttle settings.Try this. With the engine not running, and the throttle held open, try lifting on the throttle shaft at the spring. If it moves more than a tiny bit (a couple of thousandths of an inch), you too are also suffering from a worn throttle bore. A large part of you problem may be coming from there. There could also be a slight coating of crusty crud around the throttle plate movement area that is causing extra drag. Carb cleaner will deal with this easily. The throttle plate is dragging on the bottom of the bore, and the spring cannot be made strong enough to pull it closed! Unless you LIKE garage door springs as return springs... ________________________________ From: Mark <mbrush@GMAIL.COM> To: vanagon@GERRY.VANAGON.COM Sent: Wed, July 7, 2010 11:36:03 PM Subject: engine revving at idle Has anyone had this problem?  After my engine reaches operating temp and is in stop and go traffic, it doesn't fall back down to idle after I accelerate to move forward in traffic.  It just stays revved at 3,000 rpm or thereabouts.  Not fun when stuck in traffic.  I'm thinking it has something to do with the spring on the throttle (maybe needs to be cleaned or greased?).  I haven't worked on this part of the van yet, so I'm not familiar with how the accelerator cable hooks up and works in the engine compartment. Thanks for any insights! Mark -- Mark 1990 Westy (2.1 - manual)


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