What Causes Abnormal Noise When Accelerating a Car?

[LaLorenzo]

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.

[VanParker]

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.

[DavidLee]

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.

[OElijah]

Abnormal noises during car acceleration actually involve various mechanical structure issues. For example, when there's an intake pipe leak, a hissing sound occurs as air passes through the crack; belt system failures produce sharp friction noises, especially when the belt is loose; bearing damage results in humming or clattering sounds; there's also engine knocking issues where incorrect gasoline octane ratings cause metallic knocking sounds. The sources of abnormal noises differ at various RPMs: low-speed acceleration issues often focus on belts and bearings, while high-speed noises may involve the transmission or drive shaft. It's best to record the noise characteristics with a phone as it greatly aids diagnosis.

[StMichael]

Last time on the highway, I suddenly heard a metallic scraping sound from the throttle, which scared me into slowing down immediately. After pulling over, I found out that a stone was stuck in the brake disc guard, causing vibrations and noise when accelerating. Such sudden abnormal noises are the most dangerous. Common causes also include: broken dust covers on the chassis leading to direct metal friction; exhaust pipe hangers coming loose and causing collisions; or aftermarket intake pipes becoming loose. If you encounter abnormal noises, don’t panic. Gently press the throttle to test for changes in the sound, drive to an open area to stop and inspect, focusing on whether there are any foreign objects under the chassis. I remember once forgetting to remove the jack before driving, and every time I accelerated, there was a loud clanging sound—it was really scary.