Why does the car make abnormal noise when accelerating hard?

[Rochelle]

Abnormal noise when stepping on the accelerator may be caused by excessive clearance in components like the drive shaft or poor lubrication. Improper assembly during maintenance can lead to friction noise under high torque output. Below is an introduction to abnormal noise when accelerating hard: 1. Abnormal noises can be categorized by their impact on vehicle performance: minor noises, general noises, and severe noises. Minor noises, such as sparking from high-voltage electricity leakage or slight looseness in rolling bearings, have low volume and cause minimal component wear. These faults can persist for a long time without significant changes, and the vehicle can still operate normally without repair. 2. Noises like those from the flywheel bearing or clutch release bearing significantly affect vehicle performance but can maintain key technical functions in the short term. These noises are louder and indicate greater component wear, requiring timely repair. When the engine oil temperature hasn't reached normal levels upon startup, its viscosity may not suit the hydraulic tappet's working condition, reducing its sealing ability and causing noise. 3. If encountering accelerator pedal issues in a new car, stay calm. Fully depress the brake pedal to stop the vehicle, then turn off the engine and contact for assistance. When starting the engine, avoid fully depressing the accelerator pedal—keeping it slightly above idle speed is best.