homemade air/fuel gauge...

[JShadzi at aol.com]

Ti, I agree, an O2 gauge is a very good tuning device, not as accurate as say a WB sensor, but any standard O2 will give you a very accurate reference to Stoich.  Typically I can get a/f ratio on an 034efi unit to within 5% of ideal using a standard O2, then fine tune it up with a WB, especially WOT where 12:1 to 13:1 mixtures are not as accurate with a standard O2.

Luke, Ti is right, you can get a nice O2 gauge from Summit for under $30, why use a multimeter?  Multimeters don't react quickly enough to the rapidly changing voltage signal, its just not going to give you any useful information, even if its free.

HTH,
Javad
>
>The white wires are for the heating element.  The black wire is
>the output of the sensor.  The ground is the engine block.
>Having said that, using a multimeter as a fuel/air gauge during
>closed loop operation is going to be useless.  The signal varies
>much too fast for most meters to register a correct reading.
>
>-Ti
>2003 A4 1.8T multitronic
>2001 S4 biturbo 6-sp
>1984 5000S turbo
>1980 4000 2.0 5-sp
>--
>    ///  Ti Kan                Vorsprung durch Technik
>   ///   AMB Laboratories, Sunnyvale, CA. USA
>  ///    ti at amb.org
> //////  http://www.amb.org/ti/
>///
>
>