What Causes Engine Noise When Pressing the Accelerator?

[LeSebastian]

Engine noise when pressing the accelerator is mainly caused by excessive clearance in components like the drive shaft, poor lubrication, or improper assembly during maintenance, which generates friction noise under high torque output. Typically, when the engine is first started, the engine oil temperature hasn't reached its normal operating value, resulting in viscosity unsuitable for the hydraulic lifter's normal operation. This reduces the hydraulic lifter's sealing performance, leading to noise. Below are solutions for engine noise when accelerating: 1. Fully depress the brake pedal to stop the vehicle, turn off the engine, and then contact for assistance. 2. When starting the engine, avoid pressing the accelerator pedal all the way down; it's better to keep it slightly above the idle throttle position.