What Causes Abnormal Noise When Accelerating a Car?
3 Answers
The reasons for abnormal noise when accelerating a car are as follows: Clutch Release Bearing Damage: A buzzing noise when pressing the accelerator could be from the fuel pump or related components. Alternatively, the clutch release bearing might be damaged. Engine Belt Aging: It's necessary to check whether there's any air leakage in the engine's intake pipe, if the air filter is properly installed, identify where the noise is coming from, and whether the engine belt is aged, loose, or slipping. Brake Caliper Issues: On the right side of the engine, it's usually the generator belt, while on the left, it could be related to the throttle body. For the front brake pads, the main cause is often the brake caliper, with a small chance of partial seizure. This might occur if the brake caliper piston was damaged when being pressed back during installation, leading to some degree of seizure.
Last time I encountered this issue, I heard a chirping sound when pressing the accelerator. After checking at the repair shop, they found it was due to a loose and aged belt. The mechanic said this sound becomes particularly noticeable during acceleration because belt slippage worsens as engine RPM increases. He also mentioned that timing belts or alternator belts are most prone to this problem. Additionally, bearing wear can cause a humming noise, like my neighbor's car, which was fixed only after replacing the water pump bearing. It's advisable not to delay and get it checked early, as issues like belt breakage can become more expensive to repair if left unattended. Paying attention to sound changes during regular maintenance is essential to avoid being stranded on the road.
I remember when my new car had just hit 20,000 kilometers, this issue occurred—a sudden rattling sound when pressing the accelerator, especially louder during uphill climbs. At the repair shop, they found it was due to a leaking exhaust manifold gasket, where escaping exhaust gases caused the noise during acceleration. The mechanic also taught me to check the oil dipstick, mentioning that low-viscosity oil might cause valve noise during sudden acceleration. Now, I've developed a habit: listening to the engine sound after a cold start, and testing for unusual noises by suddenly decelerating and then accelerating. I recommend paying attention to the specific scenarios when noises appear, such as during cold starts or after the engine has warmed up, as this can help mechanics diagnose the problem faster.
