[Diy_efi] O2 says rich, car runs lean..

[Mike Anders Nissantalk.com / Altimas.net]

A good "beater" wideband sensor kit is the AEM UEGO, easy to install, cheap,
works pretty well.

----- Original Message -----
From: "C. J. Frederick" <cfrederick at new.rr.com>
To: <diy_efi at diy-efi.org>
Sent: Sunday, June 11, 2006 9:23 PM
Subject: Re: [Diy_efi] O2 says rich, car runs lean..


> All great info.  Begging your indulgence on your topic, I saw an O2 dash
> display at a race last month.  It was in a Buick Grand National and when
> the car was idling, it updated a few times a second.  It had a blue
> digital, 3 digit display and was built into the dash.  The owner said he
> didn't know anything about it as it was in the car when he bought it.  He
> thought it was originally made for an import.  It wasn't a multi-function
> display with data logging, just a simple constant reading, rectangular
> readout.  Anyone ever see one of these?  I have searched all other sources
> known to me.
> Sorry for the interruption,
>
> CJ
>
> >On Sun, 11 Jun 2006 15:45:28 -0700 (PDT), David Rowley wrote...
> >
> >First of all I have to say that tuning with a narrow band O2 sensor is
> >useless. I've been tuning for almost 7 years not and have to constantly
> >educate people about the inaccuracies of narrowband sensors.
> >
> >Second, your readings may be related to the position of the O2 sensor.
> >If you overheat a narrowband they will frequently read rich when in fact
> >you're running lean. This too can sometimes be caused by an ignition
> >timing issue too much retard will over heat the sensor as well. If you
> >accidentally put it after a cat then that too will cause incorrect
readings.
> >
> >My suggestion is to replace the narrow band with a wideband that also
> >has a narrow output. This way you can have a proper temp-compensated and
> >accurate O2 reading converted to narrow band plus have a proper mixture
> >display on the dash. The 383 should like somewhere in the 13:1 under
> >power and should run just fine in the low 15's under cruise. If you
> >properly balance all 8 cylinders with a pyrometer you can run it leaner
> >without any ill effects for fuel economy.
> >
>
>
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