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Date:         Sat, 29 Dec 2012 01:04:24 -0500
Reply-To:     David Clarkson <dvdclarksn@AOL.COM>
Sender:       Vanagon Mailing List <vanagon@gerry.vanagon.com>
From:         David Clarkson <dvdclarksn@AOL.COM>
Subject:      Re: O2 sensor type problem after replacing O2 sensor
Comments: To: mdrillock@cox.net
In-Reply-To:  <50DDEF4B.6010106@cox.net>
Content-Type: text/plain; charset="us-ascii"; format=flowed

Thanks Mark I will definitely check that wire.

David Clarkson

-----Original Message----- From: mark drillock <mdrillock@cox.net> To: David Clarkson <dvdclarksn@AOL.COM> Cc: vanagon <vanagon@GERRY.VANAGON.COM> Sent: Fri, Dec 28, 2012 11:13 am Subject: Re: O2 sensor type problem after replacing O2 sensor

The O2 heater is powered by the FP relay in 1990 so it should be heating whenever the engine is running.

The ECU watches the Temp2 sensor and ignores the O2 reading unless the Temp2 shows the engine coolant temp to have reached a warm enough level. A bad or intermittent connection to the Temp2 could cause the ECU to run in cold mode and I believe that will be a rich condition. Not rich enough to kill the engine though.

The ECU uses a special ground to compare the O2 reading to and if that special ground is weak or missing then it will get false readings from the O2 sensor.

The special ground is the brown wire that comes out of the small bundle going to the distributor hall connector. The brown wire has nothing to do with the distributor. Make sure the brown wire has a good ring terminal crimped on to it and is bolted down to clean metal on the engine.

Mark


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