Disadvantages of direct injection system in the car.. The abundance of combustion products of nitrogen oxides. Increase engine noise and negatively affect its smoothness

What are the disadvantages of the direct injection system?

1. Many combustion products of nitrogen oxides harmful to the environment.

2. Small motors may not work well with the system for small offset sizes.

3. In the beginnings this system needed a special quality of gasoline.

4. It also increases the noise of the engine and affects the negative level of softness.