What Causes the Zizzing Sound When Accelerating the Car?

[LaElias]

When a car makes a zizzing sound during acceleration, it is most likely caused by issues with the engine oil, which may require replacement. Another less common possibility is damage to the car's half-shaft, which can cause abnormal noises when pressing the accelerator. For a precise diagnosis, it is recommended to visit a repair center. Below are some related details: 1. Definition of the throttle: In the internal construction of an engine, the device used to control the fuel supply in an internal combustion engine is called the throttle. 2. Function of the throttle: The throttle can adjust the opening of the throttle valve in the engine, thereby controlling the amount of combustible mixed gas, which changes the engine's speed and power, allowing the car to accelerate or decelerate according to driving needs. 3. Advantages of electronic throttle: The electronic throttle transmits the degree of pedal depression through a position sensor, enabling electronic control of the throttle. The use of an electronic throttle is highly precise and avoids mechanical wear issues.

[DelEmmanuel]

I've been driving for many years, and a squealing noise during acceleration is quite common, mostly due to belt issues. For example, the alternator belt or AC belt may be old or loose—when you press the accelerator and the engine revs faster, the belt slips and causes friction noise, and you might even feel cracks when touching it. Exhaust system leaks are another common cause; rust or small holes at the joints can make a hissing sound more noticeable under heavy acceleration. A worn-out fan belt can also produce this noise, especially on hot days under high load. I recommend getting it checked as soon as possible. Ignoring it could lead to belt breakage damaging the engine or increased fuel consumption due to severe exhaust leaks. Take it to a mechanic to diagnose—usually, replacing or tightening the belt solves the problem without costing much, making it much safer. Don’t wait until you’re stranded on the road to regret it.

[McAshlyn]

As a car owner, I once experienced a frustrating situation where my car made a squealing noise every time I accelerated while taking my kids out. It could be due to a loose belt or an exhaust leak. When the engine works harder during acceleration, the belt may rub and produce noise, or the exhaust connection may have aged, causing louder leakage sounds. The air conditioning compressor belt is also prone to this issue. With so many cars on the road now, ignoring such noises can be risky. If the belt suddenly snaps, the engine could overheat and leave you stranded, which is dangerous. I recommend finding a reliable repair shop for an inspection. A mechanic can easily diagnose the issue by testing the belt with a bit of water, and replacing the part isn’t expensive. Regular maintenance, including checking the belt’s condition and replacing it periodically, can prevent such problems and avoid compromising both driving safety and fuel efficiency.

[SanVincent]

My old car often makes a zizi noise when accelerating. After asking a friend, I learned it's most likely due to a loose or worn belt. When I step on the gas and the RPM rises, the belt slips or the exhaust cracks, producing a sound similar to the hissing of wind through a gap. The sound becomes more pronounced under the increased load during acceleration. Both exhaust leaks and a loose fan belt can cause this. Get it fixed promptly; delaying repairs might lead to damage in other components, such as the water pump failing and causing the engine to overheat. Simply drive it to the shop for a quick fix.

[VanHope]

I remember decades ago, it was common for cars to make a buzzing sound when accelerating, often related to belts, such as insufficient tension causing slippage and noise. Oxidized or damaged exhaust connections leaking air also cause noise, especially when accelerating as the engine's exhaust volume surges, making the hissing sound more noticeable. Aging belts are prone to cracking, and corroded exhaust systems can enlarge holes. During inspection, check if the belt is loose or if there are any rust spots on the exhaust. Replacing the parts promptly can resolve the issue—safety first.

[Mario]

I usually enjoy studying cars. A zizzing sound during acceleration might indicate belt slippage or an air leak. When you accelerate suddenly, the engine RPM surges sharply, causing the belt to slip and create friction noise, often due to a loose or cracked alternator belt. If there's a small gap in the exhaust system, high-speed exhaust gas leakage can produce a hissing sound. A faulty fan belt can cause similar issues. I suggest first identifying the source of the noise yourself, and if necessary, spraying some water to test for belt changes. Don't wait until it breaks—visit a repair shop promptly for diagnosis and replacement to avoid chain reactions like electrical shorts or engine damage.