What Causes the Zizzing Sound When Pressing the Accelerator in a Car?
2 Answers
The reasons for the zizzing sound when pressing the accelerator in a car: 1. It could be the sound from the fuel pump or related components; 2. Damaged clutch release bearing: If the abnormal sound comes from the clutch area, pay attention to the wear of the clutch. Try pressing the accelerator. If the car runs normally but does not accelerate, it is a clear sign of slipping, possibly due to worn clutch plates. If there is a sand-like sound, the clutch release bearing may already be damaged; 3. Loose engine belt: A slipping belt will produce a zizzing sound, causing friction and high temperatures, which in turn make the belt stretch further, leading to more severe slipping and a vicious cycle. It is recommended to visit a repair shop to adjust or replace the belt.
I've been driving for many years, and sometimes when I press the accelerator, I hear a hissing sound from under the car, especially noticeable during sudden acceleration. This situation generally falls into a few common causes. The most common is a loose or aged engine belt; when the belt slips and rubs against the pulley during acceleration, it produces this high-frequency noise, especially louder when the air conditioning or headlights are on. Another reason could be an air intake pipe leak; if the pipe has cracks or the joints aren't tightly secured, air escaping through the gaps can sound like a whistle. Additionally, an aged or leaking exhaust pipe gasket can also cause this, with the sound becoming clearer as the pressure increases when accelerating. For turbocharged cars, worn turbine wheel bearings might produce a metallic friction sound. It's advisable to first visit a repair shop to check the belt tension and conduct a smoke test to locate any leaks. Addressing such issues early prevents them from developing into bigger problems.
