Logs of individual cyl with O2+WB

[Rich M]

Peter,
A rich misfire will put a cylinder of oxygen and fuel into the exhaust - as
the O2 sensor is only sensitive to oxygen and not fuel, it will see a huge
quantity of excess oxygen and hence a lean reading.

Rich

> -----Original Message-----
> From: owner-diy_efi at diy-efi.org [mailto:owner-diy_efi at diy-efi.org]On
> Behalf Of Peter Gargano
> Sent: 10 July 2001 08:05
> To: diy_efi at diy-efi.org
> Subject: Re: Logs of individual cyl with O2+WB
>
>
> Richard Wakeling wrote:
> >
> > http://www.dickselectronics.cjb.net
> >
> > We have been modifying our DST (diagnostic scan tool) to take the WB
> > signal and in the process have discovered that the good old single wire
> > O2 is capable of reading individual cylinders. Please let me know what
> > you think of the logs.
>
> Very interesting Richard. What sensor/electronics are you using for your
> WB measurements. I assume the O2 sensor is a standard GM/Bosch part?
>
> You say, in the HTML, that ...
>
> > The engine at this point has a very bad miss and shows as a sudden lean
> > spot due to a cylinder of air entering the exhaust at that moment.
>
> I thought that if you get an IGN misfire, then you'd get a rich indication
> rather than a lean reading, or am I missing something?
>
> Peter.
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