Frank:

If you monitor the O2 sensor while it's still attached to the ECU what
you're seeing is the effect of the ECU reacting to the voltage from the O2
sensor, which is reacting to what the ECU is doing, and so on.  You want to
set your air/fuel mixture *without* the O2 sensor giving feedback to the
ECU.  This gives the O2 sensor its maximum possible range of adjustment to
later changes in the system.
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Tom Young                        '81 Vanagon
Lafayette, CA 94549          '82 Westfalia
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----- Original Message -----
From: "Frank Condelli" <RAlanen@AOL.COM>
To: <vanagon@GERRY.VANAGON.COM>
Sent: Monday, October 21, 2002 2:49 AM
Subject: Re: adjusting CO with O2 sensor

In a message dated 10/21/2002 12:11:53 AM Eastern Daylight Time,
LISTSERV@GERRY.VANAGON.COM writes:

> > I disconnect the O2 sensor from the ECU and then monitor the
> > output of the sensor while making the adjustments.

> Ken, why would you not leave the O2 sensor plugged to the ECU and just
> T into the O2 sensor ?  That's what I was about to do.   I'm just about to
> install one of your 02 monitors that I got from Boston Bob along with a
2.1
> big valve engine that I'm installing this week.