How does the mixture ratio feedback system work?
The mixture ratio feedback control system monitors the mixture ratio signal transmitted from air fuel ratio (A/F) sensor 1. This feedback signal is then sent to the ECM. The ECM controls the basic mixture ratio as close to the theoretical mixture ratio as possible.
What’s the best way to lean the mixture?
At altitude, set cruise power. 2. Lean by reducing the mixture gradually until the engine runs a little rough. You may see a slight increase in rpm before the engine starts to roughen. 3. Slowly enrich the mixture until the engine smooths out. This is what’s known as a “best economy” setting.
Why is mixture ratio not controlled as originally designed?
However, the basic mixture ratio is not necessarily controlled as originally designed. Both manufacturing differences (i.e., mass air flow sensor hot wire) and characteristic changes during operation (i.e., fuel injector clogging) directly affect mixture ratio.
What happens when you don’t lean the mixture?
If you plan a flight based on those figures and don’t lean the mixture, you could run out of fuel. When you adjust the fuel/air mixture, you are decreasing fuel flow to the engine to compensate for decreased air density at higher altitudes. Less fuel is needed for proper engine operation as altitude is gained.
The mixture ratio feedback control system monitors the mixture ratio signal transmitted from air fuel ratio (A/F) sensor 1. This feedback signal is then sent to the ECM. The ECM controls the basic mixture ratio as close to the theoretical mixture ratio as possible.
However, the basic mixture ratio is not necessarily controlled as originally designed. Both manufacturing differences (i.e., mass air flow sensor hot wire) and characteristic changes during operation (i.e., fuel injector clogging) directly affect mixture ratio.
Which is the best technique for leaning the mixture?
Technique: Leaning the mixture Technique: Leaning the mixture 1 At altitude, set cruise power. 2 Lean by reducing the mixture gradually until the engine runs a little rough. You may see a slight increase in rpm before the engine starts to roughen. 3 Slowly enrich the mixture until the engine smooths out.
If you plan a flight based on those figures and don’t lean the mixture, you could run out of fuel. When you adjust the fuel/air mixture, you are decreasing fuel flow to the engine to compensate for decreased air density at higher altitudes. Less fuel is needed for proper engine operation as altitude is gained.