Originally Posted by
ultra_efficient
MAF is a O2 sensor too. i should have said "after the front O2 sensor.
MAF is not an O2 Sensor. It is a Mass Air Flow sensor.
Most gasoline engines built after the late 80's have at least one O2 sensor, which is always located in the exhaust. Most cars built after the mid 90s have at least 2 O2 sensors -- one in the exhaust before the catalytic converter (called the front o2 Sensor) and one after the catalytic converter, called the rear O2 sensor.
1991 Plymouth Acclaim 3L V6.
1 dry cells with nineteen 6"x8" 316L ss plates, driven by constant current PWM set at 35 amps (13.3V at PWM). 28% KOH electrolyte. Total measured output 2.5 lpm. Mileage went from 18 to 26 mpg, all city driving (44% increase). EFIE set at .370 and I still need to play with ignition timing.