What's the reason for a hissing sound at 2000 RPM when pressing the accelerator?

[Jeremiah]

The cause of a hissing sound at 2000 RPM when pressing the accelerator is engine malfunction. Function of the car accelerator: The accelerator in gasoline engines does not control fuel injection volume, but rather regulates the throttle opening size. A smaller opening means less air-fuel mixture enters the cylinder, resulting in lower engine power output, and vice versa. Solutions for a heavy accelerator pedal: In the vast majority of maintenance cases, the primary cause of a heavy electronic accelerator pedal is obstruction by foreign objects. Therefore, when inspecting the electronic accelerator, focus on checking the pedal section for any blockages or sticking, and perform cleaning as needed. For a heavy accelerator pedal, fuel system cleaning can be performed. Alternatively, try continuing acceleration to see if the engine RPM increases but the speed doesn't - if this occurs, it may indicate a damaged sensor in the transmission locking the overdrive gear.