Date: Sat, 27 Nov 1999 16:21:21 EST
Reply-To: kenneth d lewis <kdlewis@JUNO.COM>
Sender: Vanagon Mailing List <vanagon@gerry.vanagon.com>
From: kenneth d lewis <kdlewis@JUNO.COM>
Subject: Re: How does the Oxy Sensor Work/ go bad?
Mark;
Good theory. I will ponder a reply. Three or four years ago I
built a small circuit that monitors the output of the O2 sensor. It is
basically a voltmeter on a chip. It's display consists of ten LEDs and
the information (output voltage) is a moving dot. So I have some first
hand experience on the O2 operation.
I kind of doubt that the combustion process could reduce the
molecular bond of H2O. Instead I would suspect it would just turn to
steam but I will ask around.
I am going to make another monitor for my wife's van. If you
would like one let me know. It is about the size of a match box and
should run around $20.
Drive Safely & Good Luck
Ken Lewis<Kernersville,NC>86 VW crewcab;60 T-5 Coupe
On Fri, 26 Nov 1999 18:04:43 -0800 Mark Keller <kelphoto@ISLANDNET.COM>
writes:
> Thanks Ken!
>
> I appreciate your information about the operation of the O2.
>
>If you don't mind I'd like to talk about this further? My main
>thinking is
>that on some vans the "intermittent or surging power problem is
>related to
>water in the fuel supply.
>
>But what I don't know is how the water in the fuel would affect the
>ECU's
>version of reality. Frankly I don't remember how non injected engines
>behaved with water in the fuel, it would seem they had fuel
>starvation.
>
> I felt that the presence of lot of extra oxygen in the fuel/exhaust
>stream would be the result of a water in my fuel, and high humidity,
>raining
>for hours/days as here in BC. in the intake air would further
>introduce more
>humidity
>
> It may be that the ECU is making the maximum correct adjustment to
>compensate for water in the fuel, there is just TOO much water to deal
>with,
>and the ECU gives up.
>
> I felt also that there was a different path that might occur. What
>happens to the timing when a high 02, i.e. water in the fuel shows up?
>
>Does the interaction of the timing correction have interplay with the
>O2
>sensor? Or said differently, How does the ECU determine a need to
>adjust
>spark timing?
>
>What I would like to see is some practical explanation for how the
>engine
>runs on water contaminated fuel. Then I would like to be able to say
>that
>if a van has indeed has water in the fuel, a reliable symptom would
>be________.
>
>Sincerely,
>
>Mark Keller
>91 Carat
>
>
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