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

[Programmer]

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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