Re: Running rich fix
using .4V when the afr goes lean the computer will think its fine and keep on going leaner and leaner and leaner and leaner
using .2V the computer will change the AFR from 14.7 to 14.8
if the oxy sensor is "working" but not giving enough voltage then it needs to be replaced.
Oxygen sensors simply will not produce voltage until they're hot, and many perfectly good units are replaced because some technicians test them when the engine is first started, or after it's idled for a while, which allows the unheated type to cool off.
With a cold sensor, the computer realizes it's not getting a signal and will operate in open-loop, holding the mixture at a fixed setting. Since good fuel efficiency and minimum exhaust emissions can only be had during closed-loop, it's desirable to get the sensor hot as soon as possible after the engine is started, and to keep it there while idling, so late-model oxygen sensors are equipped with an electrical heating element.
The EF has a HEGO if its not working properly at idle check the fuse near the coolant bottle.
I believe closed loop afrs cannot be modified on our falcons with the narrow band oxy sensor.
dont use closed loop like turbotrana
use a wideband oxy sensor as per my other thread