[mwebb]

what is it , that you think you are proving ?
my statement below your quote is correct
so
you are showing that the ratio of the mass of combustibles to mass of air in atmospheric ambient air ...
is LESS than 1 to 14.7 .

anyone can tell you that , with out pre heating their 02 sensor .

Originally Posted by cfg83

mwebb -

The digital AFR proves what I want to know. It shows the "cold 02 sensor" go from the 0.5 signal from the ECU/PCM to a lean condition as it warms up.

Going lean with the engine off is the proof I need.

I got advice from a dude that works for NGK(NTK?) :

CarloSW2

a digital AFR "gauge" connected to a system with heated 02 sensor
can show you only 1 thing
stoich or lambda or 14.7 to 1
OR unknown amount leaner than stoich
OR unknown amount richer than stoich
if it shows anything else it is showing blarney as 02 sensors CAN NOT measure any other condition

because 02 sensors only show stoich , if they are cycling , the system is at stoich , if the 02 sensors are not cycling , the system will set a DTC
if there is no DTC related to 02 sensors , the system is at stoich
so
on systems with 02 sensors ;
those "AFR Gauges" are as useless as mudflaps on a sledge hammer.
fact .