O2 resolution

[Seth]

This is a guess, but a 4 wire O2 sensor on a 1991 car is usually a plain
HEGO. With +12V, heater ground, O2 sense, and sense ground. If that is
the case, then there are a few O2 display schematics at:



http://www.diy-efi.org/diy_efi/members_projects.html

Hope this helps. And I could likely be wrong about it being a plain HEGO
with sense ground. Just remember you get what you pay for with free
advice :)

-Seth

RSRACE at aol.com wrote:
> 
> I just got the Dataq free Data Aquisition getup and would like to set up my
> O2 voltage to read in Air/Fuel ratio instead of voltage.  I am using the four
> wire sensor used on the 1991 MR2 Turbo.  I believe it is a wide band type.
> Does anyone know the A/F range it has or any tips for me?
> 
> Thanks
> Tom
> www.rossmachine.com/racing
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