Leading guestions+1

[Bruce Plecan]

> Bruce Plecan wrote:
> > If, I was to have a O2 sensor that worked at a different range of
voltages
> > then the gm use, could I just use a comparator at the new Os voltage
level,
> > and use it to switch from .1 to .9 volts, as it crossed it's 14.7:1?.
> I don't think so.  GM likes to compute a long term average of the O2
> voltage.  This average is used for some of the fine tuning during closed
> loop.  The target average is specified in the PROM.  In one application,
> this value changes between just about every PROM version.  A 4-speed
> PROM has a different value from a 5-speed PROM, and both differ from an
> automatic PROM, and so on.
> You might be able to insert an analog amplifier (or voltage divider)
> between the "new" O2 and the ECM's O2 input.

Anyone happen to know what the max O2 voltage is before the ecm lets the
smoke out?
Or what the max O2 diacom will record.
Grumpy


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