What Causes Excessive NO Emissions in Exhaust?

[LeWilliam]

Excessive NO emissions in exhaust can be attributed to the following reasons: 1. Incomplete combustion in the engine combustion chamber leading to an overly rich air-fuel mixture. 2. Accumulation of a large amount of carbon deposits in the intake system and engine combustion chamber. 3. Excessive combustion chamber temperature causing the exhaust emissions to exceed standards. More information about NO emissions is as follows: 1. NO emissions refer to nitrogen oxides, a type of brown, pungent-smelling exhaust gas that is produced in large quantities when the engine is under certain loads. 2. When the engine exhaust is first emitted, the NO present in the gas is less toxic, but it is easily oxidized into more toxic nitrogen oxides such as NO2. Once NOx enters the alveoli, it can form nitrous acid and nitric acid, causing severe irritation to lung tissue.