What Causes the Buzzing Sound When Accelerating?
2 Answers
Reasons for the buzzing sound when accelerating are as follows: Engine Temperature Too Low: When the car is cold-started, the engine temperature is relatively low, and various components and fluids have not reached optimal working conditions. Therefore, abnormal noises may occur when accelerating. This is a normal phenomenon and does not require special attention. After the car runs for a while and the engine temperature rises, the abnormal noise when accelerating will resolve itself. Insufficient Engine Oil: If the engine oil is insufficient or has not been changed for a long time, causing it to deteriorate, its lubricating effect will be compromised, leading to friction between components and abnormal noises. In this case, the engine oil should be replaced promptly. Damaged Half-Shaft: There are many reasons why a damaged half-shaft can cause abnormal noises when accelerating, including half-shaft twisting, breakage, or wear on the spline teeth. In such cases, it is necessary to visit a repair shop or a 4S store for professional inspection and repair.
Last time I helped my neighbor listen to this sound, I found there are mainly three most likely scenarios: One is that the belt in the engine compartment is loose or aged and cracked, causing a squealing sound when accelerating, especially noticeable in winter. Another is the sound of the turbo car's blow-off valve working, which is a characteristic of turbocharging—sounding like air leakage but is normal. Lastly, it's important to check the vacuum hoses; if there are cracks in those rubber hoses near the intake manifold, they can produce a hissing sound when the throttle is pressed hard. If the sound is high-pitched, harsh, and continuous, it's best to head to the repair shop immediately, as a broken belt or severely leaking vacuum hose could leave the car stranded halfway.
