What causes the abnormal buzzing sound when stepping on the accelerator?
2 Answers
Stepping on the accelerator and hearing an abnormal buzzing sound could be due to noise from the fuel pump or a damaged clutch release bearing. It is necessary to check whether there is any air leakage in the engine's intake pipe, whether the air filter is properly installed, and whether the engine belt is aging, loose, or slipping. The source of the buzzing sound should be identified—on the right side of the engine is the generator belt, and on the left side is the throttle. If the buzzing sound comes from the clutch area, pay attention to the wear condition of the clutch. Try stepping on the accelerator; if the car runs normally but does not accelerate, this is a clear sign of slipping, often caused by worn clutch plates. If there is a buzzing sound, the clutch release bearing is likely damaged.
Last time my car did the same thing, it made a zipping sound when I stepped on the gas, which scared me into checking it immediately. Turned out the engine belt had cracks and would slip and make noise at high RPMs. Another possibility is that the turbocharger in your turbocharged car makes louder working sounds during acceleration, which is normal and nothing to panic about. Also, a friend of mine once had an issue with the exhaust pipe gasket aging and leaking, causing a hissing sound when accelerating. If the noise is present in a new car, it might just be the normal working sound of the high-pressure fuel pump. The key is to listen for changes in the sound frequency—if it gets louder with acceleration, it’s likely a belt or exhaust issue. I’d recommend getting it checked on a lift as soon as possible to avoid a complete breakdown on the road.
