What Causes the Abnormal Noise When Accelerating at Car Start?

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Possible causes of abnormal noise when stepping on the accelerator include: excessive clearance in the drive shaft, poor lubrication, or improper assembly during maintenance, resulting in friction-induced sounds under high torque output. Below are relevant explanations: Abnormal noises can be categorized into minor noises, general noises, and severe noises based on their impact on vehicle performance. Minor noises, such as sparking from high-voltage leakage or slight looseness in rolling bearings, generally have low volume and minimal component wear, showing no significant changes over a long period. These issues can be tolerated without repair while maintaining normal vehicle operation. General noises, like those from flywheel bearings or clutch release bearings, significantly affect vehicle performance but can sustain main technical functions in the short term. These noises are usually louder with more noticeable component wear and should be repaired promptly.