What are the reasons for the sudden increase in engine noise of a car?

[MaximusRose]

The reasons for the sudden increase in engine noise of a car are: 1. The viscosity of the vehicle's engine oil is too high; 2. The drive belt is loose; 3. The car's water temperature is too high; 4. The throttle body, intake manifold, or fuel injectors are too dirty. The solutions for the sudden increase in engine noise are: 1. Check if the viscosity of the vehicle's engine oil is too high; 2. Inspect whether the drive belt is loose; 3. Check the water temperature; 4. Examine if the throttle body, intake manifold, or fuel injectors are too dirty. The function of the engine is: to convert the heat energy of gasoline or diesel into mechanical energy by burning and expanding the gas in a sealed cylinder, thereby pushing the piston to perform work.