Vanagon EuroVan
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Date:         Sat, 15 Jan 2000 23:45:56 EST
Reply-To:     Gary McEachern <glmce@HOTMAIL.COM>
Sender:       Vanagon Mailing List <vanagon@gerry.vanagon.com>
From:         Gary McEachern <glmce@HOTMAIL.COM>
Subject:      Re: Euro-Elec: 91 Volkswagen Vanagon, idiot lights, oil light
Comments: To: bonnie_baker@TELUS.NET
Content-Type: text/plain; format=flowed

Richard

I think I can tell you a little bit about how the oil pressure switches tie into the Dynamic Oil Pressure System in the later year Vanagons.

The 0.3 bar switch located between the pushrod tubes is normally closed (low resistance). It should open (high resistance) when the pressure is above 0.3 bar at idle. This is the only pressure switch used when the engine is started and the speed is kept below 2,000 rpm! It sounds like you have the wrong switch in this location. The proper switch should read less than 10 ohms with the engine off!

The 0.9 bar switch, located beneath the waterpump, is normally open when there is no or low pressure. The switch closes (low resistance, <10 ohms) when the pressure is above 0.9 bar. This "high pressure" switch is used by the Oil Pressure System when the engine revs above 2,000 RPM.

If you question whether the oil pressure is OK, it is best to put a gauge on it to measure it. If you suspect the Dynamic Oil Pressure system is giving you false alarms, you can simulate a proper pressure by grounding the 0.9 bar switch wire and leaving the lead to the 0.3 bar switch disconnected. The oil light and buzzer should stay off at idle and above 2000 rpm. If the oil light continues to flash you either have a problem with the wiring going up to the dash or in the dash itself. It can happen!

If the oil light wasn't flickering when the engine was cold but started to when it got warm I believe you really have low oil pressure. Make sure you have a quality german oil filter installed. A cheap filter can cause low oil pressure. I've been there so I know from experience.

Good Luck

Gary

----Original Message Follows---- From: "Richard Meissenheimer (by way of Derek Drew <drew@interport.net>)" <bonnie_baker@TELUS.NET> Reply-To: "Richard Meissenheimer (by way of Derek Drew <drew@interport.net>)" <bonnie_baker@TELUS.NET> To: vanagon@GERRY.VANAGON.COM Subject: Euro-Elec: 91 Volkswagen Vanagon, idiot lights, oil light Date: Sat, 15 Jan 2000 09:51:46 -0500

iATN Help: send blank email to: help@i-atn.com Upgrade: http://members.iatn.net/enhanced.html Archives: http://members.iatn.net/sponsorsindex.html Post Message: http://members.iatn.net/email/ _______________________________________________________

1991 Volkswagen Vanagon 2.1 L

Trans: Standard Mileage: 200,000 kilometers VIN: WV2ZB0256M

Misc Data: Synchro Affected Item: oil light Condition: flashing

____________________________________________________________

After installing replacement engine, oil light flashes when engine is warm and idling. I installed a new grey oil pressure sensor in the port below the water pump. This did not change anything. I then found out that there is a second oil pressure sensor between the push rod tubes on the left side of the engine. I replaced that one with a known good grey switch. This did not change anything. I have not checked the actual pressure because I do not have the necessary adapters for my oil pressure gauge, and also because of the inaccessibility of the ports. I measured the resistance of the switches and found them to be 2.5k with the engine off and about 400 with the engine running. Can anyone explain to me how this system works? Things were so much simpler when VW's used air to cool their engines! Thank you in advance.

Richard Meissenheimer bonnie_baker@telus.net Technician/Shop Foreman Lakeside Auto Sales Nelson, British Columbia, Canada

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