What Causes the Engine to Make a Buzzing Sound?

[StSienna]

Reasons for engine buzzing sound: 1. Buzzing sound at idle: This may be caused by the operation of the electronic fan used for radiator cooling. However, this sound is intermittent. If the buzzing persists, it could indicate a faulty temperature sensor or temperature regulator. 2. Buzzing sound during low-speed driving or gear shifting: This is usually caused by excessive clearance between the piston and cylinder wall. Improper installation leading to overly tight assembly or abnormal wear can also produce buzzing sounds. 3. Buzzing sound during high-speed driving: This may be caused by sound resonance. During high-speed operation, using incorrect engine oil can also lead to this phenomenon. Improper oil selection prevents adequate lubrication inside the engine, potentially causing buzzing sounds. Alternatively, water pump abnormalities such as blockages or leaks can also result in engine buzzing issues.