How to Solve Excessive NO Emissions?

[MaximusLynn]

Excessive NO emissions can be addressed by: first inspecting the three-way catalytic converter to ensure it is functioning properly, then checking if the EGR valve is stuck. NO refers to nitrogen oxides, and the reasons for excessive emissions are: 1. The air-fuel mixture in the engine combustion chamber is too rich, usually caused by incomplete combustion; 2. Severe carbon deposits, mainly in the intake system and engine combustion chamber; 3. The combustion chamber temperature is too high with sufficient oxygen supply. NO is the general term for nitrogen oxides, which are gases formed by the chemical reaction between nitrogen and oxygen. The primary component of the well-known PM2.5 is nitrogen oxides. Compression-ignition engines primarily emit NO, while spark-ignition engines emit CO, HC, and NO. For gasoline engines, excessive NOx emissions are relatively rare.