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

[Programmer]

> 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.<<

Yes--the overall AFR goes richer, as the missfire is "calculated" as being
lean. It's interpretted as being lean because of excess O2 in the exhaust.
The same thing happens with any false air ahead of the O2 sensor.

> 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?<<

Because of the type of O2 sensor, it only works in a very narrow band
around 14.7--not all the O2 is gone, however...there's still enough for
proper converter operation.

Lyndon.
>
> -----Original Message-----
> From: owner-diy_efi at diy-efi.org [mailto:owner-diy_efi at diy-efi.org] On
> Behalf Of Mark S. Riley
> Sent: Sunday, September 02, 2001 1:11 PM
> To: GM-ECM List; diy-efi list
> Subject: DIY-WB... It's alive...
>
>
> Got the board finished and mounted in the box to the lid like Bob R did.
> Put the terminal strip on the top side of the lid. Got everything hooked
> up and it heated but voltage stayed at 2.48 volt. Took it back apart and
> I put the led in backwards and had one of the leads on capacitor C7
> touching the trace crossing under it. Not quite the way it's supposed to
> be. Repaired those goofs and it works!! Clean air voltage is 3.98 and
> sticking it in the end of the tail pipe on my Escort shows voltages down
> to 2.2 volt just patting the gas pedal. Now have to put a bung in front
> of the cat to get more accurate part throttle readings. Am going to make
> a two bung pipe kinda like Bruce's so I can check it against Horiba
> driving around. Later, Mark
>
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