What causes abnormal noise at low speeds that disappears after acceleration?
2 Answers
Reasons for abnormal noise at low speeds that disappears after acceleration: deformed exhaust pipe; engine abnormality. The following details the causes: Deformed exhaust pipe: In most front-engine vehicle models, the exhaust pipe runs from the bottom of the car to the rear. Driving on rough roads or hitting the undercarriage can easily cause the exhaust pipe to dent or deform. A deformed exhaust pipe increases exhaust resistance, leading to abnormal noises. Engine abnormality: This is mainly caused by excessive wear of certain parts or improper assembly and adjustment. Some abnormal noises can serve as warnings, while engine noises may indicate potential serious damage. Therefore, when engine noises occur, they should be promptly repaired to prevent further damage.
As an ordinary person who drives frequently, it's quite common to encounter strange noises at low speeds that disappear when accelerating. I remember that time I went on an outing, my car always made a squeaking sound below 30km/h, but it became quiet once I accelerated past 40. Later, a check-up revealed it was a tire balance issue. The mechanic said that uneven wear on the tire tread at low speeds caused the friction noise, and the vibration stabilized after speeding up, so the noise disappeared. It could also be due to loose suspension ball joints or worn brake pads, which cause strange noises from greater shaking at low speeds. If not addressed in time, it might seriously affect steering wheel stability, so it's recommended to take some time to visit a repair shop for a four-wheel alignment and suspension check. Usually, pay more attention to the condition of the tires before driving to avoid long-distance bumps exacerbating the problem.
