What Causes the Zizzing Sound When Pressing the Accelerator?
3 Answers
One of the reasons for the zizzing sound when pressing the accelerator is: 1. The engine temperature is too low: When the car starts cold, the temperature of the engine is relatively low, and various parts and fluids have not reached an optimal working environment and state; 2. Lack of engine oil: leading to deterioration of the oil, affecting lubrication, and causing abnormal noises from part friction; 3. Damaged half-shaft: including twisted or broken half-shafts, worn spline teeth; 4. Loose engine belt: causing idle revving when accelerating. The accelerator, also known as the 'throttle' or 'air valve,' refers to the control device that regulates the engine's power (thrust). In piston-type aircraft engines, the throttle controls the carburetor's throttle opening to regulate the cylinder's filling volume, determining the engine's output power. In gas turbine engines, the throttle controls the metered fuel flow of the fuel regulator, determining the thrust produced by the engine.
Over my years fixing cars, that high-pitched squeal when stepping on the gas is usually belt slippage. When belts age or loosen, friction with pulleys creates high-frequency noise, especially during acceleration. Another possibility is exhaust pipe joint leaks where escaping air hisses through gaps. Simple check: pop the hood to locate the sound source - belts typically sit at the front. Don't ignore it; a snapped belt can stop the water pump, disable power steering, or cause engine overheating. Get to a shop promptly for adjustment or replacement before minor issues become major repairs. Regular maintenance should include checking belt tension and wear - prevention saves headaches.
My car had the same issue a while back, making a squealing noise whenever I stepped on the gas—so annoying! I asked a car-savvy buddy, and he said it was an engine belt problem. When the belt wears out, the tension isn't right, or if it gets oily, the friction spikes during acceleration and causes the noise. Later, I took it to the shop, and sure enough, the belt was shot—replacing it fixed the issue. This kind of noise usually comes from the engine bay, but it could also be due to an exhaust leak or a clogged air filter. Don’t ignore it—if the belt snaps, you’ll be stranded. You can pop the hood and check the belt yourself; if it’s cracked or loose, get it fixed ASAP. Regular maintenance can prevent this, saving you hassle and money.
