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Date:         Sun, 14 Jan 2007 17:06:48 -0500
Reply-To:     Ronald Michaels <rbm1024@NETSCAPE.NET>
Sender:       Vanagon Mailing List <vanagon@gerry.vanagon.com>
From:         Ronald Michaels <rbm1024@NETSCAPE.NET>
Subject:      Re: Auxiliary air regulator

On Sun, 14 Jan 2007 04:39:41 +0000, Dennis Haynes <dhaynes@OPTONLINE.NET> wrote:

>If you have 5 volts on the plug for the auxiliary air regulator, you have the wrong plug. You swapped the plug with the throttle switch. So you either blasted the new switch or burned up a wire connection for the 12 volt supply for the air regulator. That supply is un fused. so something has to give. Usually the switch gets blasted. > >Dennis > >----- Original Message ----- >From: Ronald Michaels >Date: Saturday, January 13, 2007 5:20 pm >Subject: Auxiliary air regulator >To: vanagon@GERRY.VANAGON.COM > >> Hi >> >> I am troubleshooting some problems with my 85 Westy FI system. >> Thanks to >> List members who helped me find a idle enrichment switch >> recently. I have >> that part installed now. >> >> Today I tested the auxiliary air regulator as outlined in >> Bentley. After >> the engine warms up the regulator should close and pinching the >> hose should >> not make a difference. The thing does not close. After taking the >> regulator out of the vehicle I have measured a supply voltage >> across the >> pins of the electric plug of 5 volts (no voltage value shown in >> Bentley).The regulator has a resistance of 30 ohms. The sliding >> door (gate, >> whatever) inside the regulator moves freely when I use a >> coathanger wire to >> check it. I have tried another regulator from a 84 engine >> (Thanks Sadir) >> and it does not close either. Lots of WD 40 didn't help. >> >> I adjusted the regulator to be only slightly open and the engine >> idle is >> slower but it still is not working correctly. >> >> Am I missing something? Are the voltage and resistance values >> correct? >> Has anyone ever disassembled one of these? I think I can get it >> apart, but >> getting it back together might be a little harder. What are the >> failuremodes? Any advice is appreciated. >> >> Thanks, >> >> Ron in Seymour TN with 84 and 85 Westys and 78 bus - Buster VanWaggon >>

Hi -

You had it right. The air regulator 12 V supply and the idle air switch 5 volt signal were backwards. The new $70 idle switch I bought recently was fried.

I have a 84 throttle body with switches on the top so I made up a little wire harness and put it on. The air regulator closes now and the idle switch works. I still have excess air so I get a little hunt at idle, but I can chase that down.

I thought that the idle air regulator might have a rotating cylinder in a close fitting tube, so I took my spare one apart. Just for the record, there are 4 small rivets to grind the heads off of and then grind off the crimped section all around the outside. The active part seems to be a bimetalic switch with a heater coil around it. Other than electrical failure or too much trapped goo, there are not any obvious failure mechanisms.

Thanks again,

Ron


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