[mwebb]

if your system has an 02 sensor
what is described below is NOT possible

with an 02 sensor for feedback
in closed loop;
the system can only operate at lambda or stoich or 14.7 to 1

if the 02 sensor is cycling from 150mv to 850mv in 100ms and back in 100ms which is what it is designed to do which is how it is designed to operate ,
then the system is at 14.7 to 1 air to fuel ratio .

if the 02 sensor is pinned near 150mv the ECM thinks the system is
an UNKNOWN amount leaner than 14.7 to 1 and the ECM will set a DTC for lean condition

if the 02 sensor is pinned near 850mv the ECM thinks the system is
an UNKNOWN amount richer than 14.7 to 1 and the ECM will set a DTC for rich condition

to have a system that operates leaner than 14.7 to 1 in closed loop
you need to have an Air Fuel ratio sensor for feedback

after the mixture enters the combustion chamber
the mixture can not be changed by the combustion process

after the mixture enters the combustion chamber the mixture can not be changed by the combustion process

after the mixture enters the combustion chamber
the mixture can not be changed by the combustion process

no matter the quality or lack of combustion
the mixture does not change

Originally Posted by jamminjimmy

yeah.... I would think any product/part/mod that improves combustion

(thus causing the O2 sensor to sense a lean-burn condition),

would have a mod/instructions to compensate for the change in O2 sensor signal so that the ECU doesn't "dump" more fuel in to compensate.....

thanks for this thread, I was wondering about them, and there isn't much info out there....