Date:         Thu, 24 May 2012 12:50:43 -0400
Reply-To:     David Beierl <dbeierl@ATTGLOBAL.NET>
Sender:       Vanagon Mailing List <vanagon@gerry.vanagon.com>
From:         David Beierl <dbeierl@ATTGLOBAL.NET>
Subject:      Re: 86 Syncro 2.1 surging at 2K rpm no load
Comments: To: neil n <musomuso@gmail.com>
In-Reply-To:  <CAB2Rwfie-xOPeLrHrmPcrAeLg+T16d7q8iufNAgmsii_7x15mw@mail.g
              mail.com>
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At 12:38 PM 5/24/2012, neil n wrote:
>When checking the TPS with VOM (continuity at idle) is it worth
>disconnecting the accelerator cable to ensure throttle arm is
>resting against it's stop properly?

The problem here is a switch that's not opening, rather than not
closing.  Much less common, rare even.  Or a wire could be shorting to ground.

But yes, there has to be enough slack/easy enough operation of the
throttle cable for the throttle to close against the stop even in
cold weather when the pedal is gently released.  Even more of an
issue with the A/T where the cable stops at the kickdown lever on the
transmission and has to operate that as well.  And in principle the
switch adjustment should be made with everything shut down and
preferably out of the vehicle where you can free up the adjusting cam
and make sure everything is all right before you ream out that soft
aluminum hex socket on the cam (one-switch verseion).  But when the
throttle body is worn you often have to make the adjustment with the
engine running.  Either way the two-switch people have it a lot
easier than the one-switch.  Everything is big and sturdy and out in the open.

Yrs,
d