| Author | Message | ||
     Reepicheep |
(moved over from another thread in case people want to explore this topic with me) I'm still trying to wrap my head around how the O2 sensors actually work. For a zirconia sensor, there is reference air inside a chamber inside the sensor, and the outside of the sensor is in the exhaust stream. When the outer air has less oxygen than the reference air, the oxygen ions are moving through the zirconia one direction and creating a small charge of one polarity. When the outer air has more oxygen than the reference air, the charge is the opposite direction. And I assume they have some kind of amplifier to translate that into what is basically an on/off signal. Now when operating, the sensors are measured, and when they go high, the engine management system changes fuel to try and drive them low. When they go low, the engine management system changes fuel to try and drive them high. So the net effect is that the sensor should be constantly bouncing back between high and low as the engine is constantly adjusting. I still don't understand two things yet though.. 1) Is it a pocket of reference air always sealed in the sensor? Or ambient? 2) How does the engine translate between the concentration of the reference air and get that to a correct stoichiometric air fuel ratio? Perhaps it is sealed, and what is sealed is the optimal oxygen concentration for an internal combustion engine, and that explains both my unknowns (but leads to another of explaining why the sealed in oxygen doesn't get "discharged" over time in it's reaction with the Zirconia). | ||
| Buellistic |
They work by what is called "FM" which translates to "F--king Magic" !!! It controls electron flow using heat ... If you get a CHECK ENGINE LITE and it indicates the 02 sensor you have two chooses: clean it or replace it ... "IT MUST BE INSTALLED AND TORQUED PROPERLY !!!" | ||
| Sagehawk |
Just now looked over here and saw this thread. Yeah, I'm never at work on time either. My priorities are low. Just saying! whats to say thay dont bleed down over a millenia? I just changed both in my 2000 b2500 pickup, one last fall and one two months ago. no codes and truck wasnt running bad at all. But , it just seems to run a bit cleaner and mileage is still 22-23 for 500 mile commute a week. Now, for my thought. why does uly o2 sensors seem to die a horrible , early death? I spoke in a thread in uly threads earlier on my afv changing. what does change? degradation of o2 sensor performance? one in truck was 15 years old, one was 16 years old, and buell is 9 years old with low mileage. all are bosch sensors. hmmmmmm. |
