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Re: V8 O2 Sensor check....
On 18 May 1996, Michael LaRosa wrote:
> I took my new shiny Sunpro 7678 meter and measured the Sensor
Bravo, you'll find alot of things are much easier with this tool in your box.
> and the sensor measured .440 +/_ .002 or so. I ran for about 5-7
> minutes and the sensor went as low as .436 and as high as .442.
Sounds reasonable. I wonder if the meter is measuring an average over
time. That would mean that your V8 idles a little lean of stoichiometry -
probably OK. With an O2 sensor meter, you will see the fluctuations in the
O2 sensor output. I would guess that .3 - .8 volts would be common.
> Then I shut off the car and restarted it, the sensor jumped .458 and
> settled in again to .441 with a second or so.
Sounds like your ECU is competant.
> This seems to be ok, yes ?
> Then put the 7678 on 200 ohms scale and measured across
> the heater wires with the engine off. I get 5.2 Is this correct ?
I don't know what the spec is, but this sounds reasoanble. Any heater
that I have ever measured has been in the 3-7 ohm range.
Graydon D. Stuckey
Flint, Michigan USA
'86 Audi 5000 CS Turbo Quattro, GDS Racing Stage II