What Causes the Zizzing Sound When Accelerating a Car?

[VonKeira]

There are several reasons why a car makes a zizzing sound when accelerating: 1. Engine noise. There are many possible causes of noise in the engine compartment, usually a sharp metallic sound or a whistling noise. 2. Transmission noise. The sound disappears when the clutch or accelerator is pressed, but a whistling-like sound may occur during gear shifting. 3. Wear-related noise. Some parts of the car body may produce slight noises when accelerating or braking, which do not affect normal driving. Solutions for the zizzing sound when accelerating are as follows: 1. Engine noise. Engine noise indicates a change in the technical state of a certain mechanism in the engine, mainly caused by excessive wear of some parts or improper assembly and adjustment. Some noises may even predict potential catastrophic engine damage. Therefore, when engine noise occurs, it should be repaired promptly to prevent further damage. 2. Transmission noise. The transmission has many components, and the causes of noise are complex. When analyzing, pay attention to: whether the noise is related to specific speeds (e.g., some planetary gears produce noticeable noise around 50 km/h); whether it is related to certain gears (this is crucial for diagnosing transmission issues—if noise occurs in a specific gear, it is likely related to components affecting that gear; if noise occurs in all gears, it may be due to issues with the constant-mesh gear shaft or insufficient transmission oil); and whether it is related to specific actions (e.g., gear shifting, starting, sudden acceleration, sudden deceleration, or turning, which are effective indicators for diagnosing noise, especially changes in speed and direction for rear axle issues). 3. Wear-related noise. Solution: Door noise is mainly caused by insufficient lubrication, but it is important to determine whether it originates from the door hinges or internal components like the window regulator, lock mechanism, or handle mechanism.

[MacAubrey]

I've been driving for over ten years and have encountered a few instances of sudden hissing sounds during acceleration, which were quite annoying. The most common issue is with the belts in the engine compartment, such as the alternator belt or air conditioning belt being loose or aging and peeling, causing friction noise when accelerating. It could also be a vacuum hose leak, sounding like a hissing wind noise. Inspection method: After parking, open the hood, have someone step on the accelerator while you listen closely to locate the source of the sound. If the belt is cracked, it needs to be replaced; otherwise, the noise will get worse and may lead to a breakdown. Safety first, don't take it lightly—get it checked at a repair shop early to avoid damaging more parts. I once ignored it, and the belt snapped, leaving the battery dead and the car completely stalled.