What Causes the Squeaking Sound When Pressing the Accelerator in a Vehicle?
3 Answers
The causes of a squeaking sound when pressing the accelerator in a vehicle are: 1. Aging accelerator cable; 2. Mechanical wear between the accelerator pedal components; 3. Increased free play in the vehicle's mechanisms; 4. Clutch wear. The functions of the accelerator are: 1. Controlling the engine's speed by adjusting the pedal pressure; 2. Regulating the carburetor to determine the engine's output power. The working principle of the accelerator is: When the accelerator pedal is pressed, it directly controls the throttle valve. The throttle valve opening increases, allowing more air to enter the engine. At this point, the ECU commands the fuel injection system to inject more fuel, thereby increasing the engine's RPM and enabling the vehicle to accelerate.
I've been driving for over a decade and have encountered a buzzing sound when pressing the accelerator pedal. The noise resembles an electrical whine or friction sound, which can be quite concerning. I remember one instance where the sound kept getting louder, and upon inspection, it turned out to be a loose connection in the throttle position sensor wiring, causing poor contact and electronic system interference noise. Similar issues could include friction sounds from an aging throttle cable or a clogged air filter causing airflow obstruction and resulting in a buzzing noise. Additionally, engine vacuum leaks during acceleration can produce such sounds, especially when rubber hoses are aged or loose. If you notice this buzzing sound, don't panic. Find a safe place to pull over and check for any wear on the cables near the accelerator pedal, and try cleaning the air filter as a simple fix. If the noise persists, get it checked immediately, as prolonged issues could affect throttle response or even damage other components. Regular maintenance can prevent many such problems—don't underestimate these small sounds; addressing them early can avoid major repairs.
I just got my driver's license, and when I stepped on the gas pedal in my small car, I heard a zizzing sound, which really startled me. A friend told me that this noise might come from a slipping belt or electrical components in the engine compartment, such as poor contact in the wiring harness causing interference. It could also be due to dirty intake valves, creating resonance noise as air flows through. If the vehicle is a newer model with electronic throttle, a faulty sensor might also cause this situation. I think it's best not to drive too fast for now and try checking if the belt under the hood is loose or if the plug connections are clean. For safety, it's better to drive directly to a repair shop and have them test it with instruments. If it's not a big issue, there's no need to worry. Regular vehicle maintenance, such as periodic oil changes and cleaning, can help reduce such noises.
