What Causes the Buzzing Sound When Engine RPM is High?
1 Answers
Engine RPM is high with a buzzing sound due to the following reasons: Faulty temperature sensor or temperature regulator: When the car is in normal idle state, the buzzing sound may be caused by the electronic fan working for radiator cooling. However, this sound is intermittent. If the buzzing persists, it may indicate a faulty temperature sensor or temperature regulator, requiring timely inspection by the owner to avoid abnormalities during driving, which could lead to more severe car failures and financial losses. Cylinder malfunction: The buzzing sound at low speed or during gear shifting may be caused by excessive clearance between the piston and cylinder wall, improper assembly tightness, or abnormal wear during installation. Another possible cause is engine knocking, where the initial stage of knocking produces a buzzing sound, which could be due to advanced ignition timing or excessive carbon deposits in the cylinder. Engine oil issues: During high-speed operation, using the wrong engine oil can also cause this phenomenon. Incorrect oil selection may result in insufficient lubrication inside the engine, leading to a buzzing sound. Alternatively, a malfunctioning water pump, whether clogged or leaking, can also cause the engine to produce a buzzing noise.
