DIY-WB... It's alive...

[rr]

The general consensus has been that the ECM applies the bias. I have
not found any evidence of this. Maybe some ECMs do. My belief is
that the sensor that generates this voltage.

BobR.

Programmer wrote:

> Does the O2 make the 450 mV, or is it bias voltage from the ECM ?
>
> Lyndon
> ----- Original Message -----
> From: rr <RRauscher at nni.com>
> To: <diy_efi at diy-efi.org>
> Sent: September 2, 2001 6:15 PM
> Subject: Re: DIY-WB... It's alive...
>
> >
> > As mentioned the O2 sensor responds first & foremost to O2. When
> > the exhaust is stoich, the partial pressure of O2 in the atmosphere will
> > cause the O2 sensor to generate ~450mV. In order for the O2 sensor
> > to detect a rich condition, there is a platinum coating on the sensor
> cone.
> >
> > Platinum being the catalyst it is will burn off the HC by pulling O2
> > through the porus cone. This action generates a voltage > 450mV.
> >
> > BobR.
> >
> > John Dammeyer wrote:
> >
> > > I have a question about O2 sensors in general.  On a fuel injection
> > > setup where the ignition has a bad miss or even fails for a 1/4 second
> > > while injection continues,  will the O2 sensor go rich because the fuel
> > > isn't being burnt or lean because the O2 is still in the mixture.
> > >
> > > That then begs the question.  If the Stochimetric condition is when all
> > > the O2 used to burn all the fuel,  how can it ever show a rich
> > > condition?
> > >
> > > Regards,
> > >
> > > John Dammeyer
> > >
> > > -----Original Message-----
> >
> > <snip>
> >
> >
> > --------------------------------------------------------------------------

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