What Causes the Abnormal Noise Inside the Car When Accelerating?
3 Answers
It is abnormal for a car to make strange noises when accelerating. The reasons for abnormal noise when stepping on the accelerator are as follows: Fuel pump motor noise: When the fuel pump motor is internally worn or contaminated with impurities, it will produce abnormal noises as the driver presses the accelerator. In such cases, the fuel pump needs to be replaced. Throttle body noise: Modern throttle bodies are electronic. The motor controls the opening and closing of the throttle valve. When the motor gears are worn, inadequate meshing can cause abnormal noises. Excessive carbon deposits or sludge in the throttle body can also lead to noise. The throttle body can be cleaned, but if the motor is damaged, the throttle body must be disassembled to replace the servo motor. Poor lubrication of the accelerator pedal bearing: Poor bearing lubrication can cause abnormal noises. You can apply grease to the bearing for lubrication.
As a veteran driver with decades of experience, I often encounter abnormal noises when pressing the accelerator, especially issues related to engine components. It could be due to a loose or worn engine belt, causing squeaking sounds during acceleration; or aging engine mounts with insufficient damping, leading to increased vibrations and noise. Another common cause is loose exhaust pipe connections resulting in a buzzing sound, which I've seen on a friend's car. Worn universal joints in the driveshaft may also produce alarming clicking noises. My advice is not to ignore these signs—get them checked at a repair shop early instead of attempting DIY fixes that might worsen the damage. Regular maintenance like belt replacement and mount inspections is crucial. I service my car every six months to prevent minor issues from escalating, because safety always comes first—only then can you drive with peace of mind.
I have a passion for cars and always enjoy researching these minor issues. When there's abnormal noise while accelerating, common causes include problems with the belt system, such as the air conditioning compressor belt slipping, producing a sharp squealing sound. Alternatively, worn suspension bushings can amplify vibrations, especially noticeable on bumpy roads. I once encountered a cracked exhaust manifold causing air leaks, which resulted in a roaring noise. It's advisable to record the sound characteristics to aid diagnosis and pinpoint the direction: noises from the front of the car may indicate engine components, while sounds from beneath the chassis are likely suspension-related. Address the issue early at a professional shop—minor repairs are affordable, but neglecting them could lead to costly transmission damage. While I self-study automotive knowledge, complex problems still require expert attention to ensure driving safety.
