Date:         Sat, 22 Aug 2009 00:20:26 -0400
Reply-To:     Ken Lewis <kdlewis@NORTHSTATE.NET>
Sender:       Vanagon Mailing List <vanagon@gerry.vanagon.com>
From:         Ken Lewis <kdlewis@NORTHSTATE.NET>
Subject:      Friday question.Re: Vacuum gauge NVC
Content-Type: text/plain; format=flowed; charset="iso-8859-1";
              reply-type=original

    I have searched the internet but can not find the answer.  All web sites
state a "normal" engine's vacuum, at idle, is ~ 17 to 21 inches at the
intake manifold. But, all these examples are for cars with one manifold
connected to at least four cylinders. I am trying to diagnose a flat four
with four venturis and individual intake manifolds. When I  attach the
vacuum gauge under a single venturi it produces rapid swings from zero to
20. Do I need to connect all test ports together to smooth these readings
out or is this the problem?
TIA
Ken