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Date:         Wed, 26 Sep 2007 15:36:41 -0700
Reply-To:     "Mike \"Rocket J Squirrel\" Elliott" <camping.elliott@GMAIL.COM>
Sender:       Vanagon Mailing List <vanagon@gerry.vanagon.com>
From:         "Mike \"Rocket J Squirrel\" Elliott" <camping.elliott@GMAIL.COM>
Subject:      An Auxiliary Air Regulator puzzle
Content-Type: text/plain; charset=ISO-8859-1; format=flowed

So I'm looking at the Auxiliary Air Regulator in my 1.9L. It is supposed to bypass a little air around the throttle when cold and give the engine a little more pep. 12V from the fuel pump relay applied to its terminals causes that bypass to close after a couple minutes. At this point the engine can presumably get along fine without it.

So Bentley's (24.28) gives us a simple test to see if the thing is working: start the engine and while cold, pinch the rubber hose. The rpms are supposed to drop.

Well, they didn't so I moved to the next test: check to see if the AAR is getting 12V when the fuel pump is on, and it does.

Then to the bench: you can look through the AAR and there is a disc blocking the passage, but there is a small hole in that disc which makes it easy to blow through. When 12V is applied to the AAR, the disc slowly rotates so the little hole is no longer visible after a minute or two and it's hard to blow through.

So -- the AAR is fine, the hoses are fine, but pinching the hoses doesn't drop the rpms, as Bentley's say it should.

--

Mike "Rocket J Squirrel" Elliott 71 Type 2: the Wonderbus 84 Westfalia: Mellow Yellow ("The Electrical Banana") 74 Utility Trailer. Ladybug Trailer, Inc., San Juan Capistrano KG6RCR


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