What Causes the Zizi Sound When a Volkswagen Starts?
2 Answers
The reasons for abnormal noise when a car starts are as follows: 1. Engine Abnormal Noise: Engine abnormal noise indicates that there may be multiple possibilities of noise coming from the engine compartment. Most people also judge the source of the noise as coming from the engine compartment, which is usually a sharp metallic sound or a whistling noise. When the engine produces abnormal noise, it should be repaired promptly to prevent the fault from expanding. 2. Transmission Abnormal Noise: Transmission abnormal noise symptoms indicate that there is a "rustling" sound inside the transmission while the car is moving, which disappears when the clutch or accelerator is pressed. There may also be a whistling sound when shifting gears. If a specific gear produces noise, it is definitely related to the components affecting the transmission of that gear. If all gears produce noise, it is often due to a fault in the constant mesh gear shaft or insufficient oil in the transmission.
My experience tells me that the buzzing sound when a Volkswagen starts is mostly caused by the brake system or the engine belt. Let's talk about the brakes first: When you release the brakes to start, there may be dust accumulation or uneven wear on the brake discs or pads, causing friction noise; if the brake pads are worn too thin, exposed metal pieces rubbing can also produce noise. Not replacing them in time may affect braking performance and increase stopping distance. Now about the belt: Belts like the alternator belt or air conditioning belt, when aged, loose, or hardened, tend to squeak when the engine starts and the load changes, and it's more noticeable on rainy days. I've seen many car owners ignore it at first, only to face higher replacement costs later. I recommend going to a repair shop as soon as possible to check the specific location, such as having a mechanic use a stethoscope to locate the sound source, to prevent minor issues from turning into major accidents.
