Why is there a gear friction sound when stepping on the accelerator?

[AshleyDella]

Stepping on the accelerator produces a gear friction sound due to inaccurate signals from the engine knock sensor. Here are some related introductions about the car accelerator: 1. Function of the car accelerator: The throttle in a gasoline engine does not control the fuel injection volume but rather the opening size of the throttle valve. A smaller opening means less mixture enters the cylinder, resulting in lower engine power output, and vice versa. 2. Solutions for a heavy accelerator pedal: If the accelerator feels heavy, you can perform a fuel system cleaning. Alternatively, try continuing to accelerate to see if the engine speed increases but the vehicle speed does not. If this happens, it may be due to a damaged sensor inside the transmission, which locks the overdrive gear.