What is the reason when the car's accelerator is fully pressed but the RPM does not increase?

[Marc]

Factors that cause the car's RPM to not increase when the accelerator is pressed mainly include faults in the car's accelerator pedal, intake system, fuel system, ignition system, and ECU control components. Below is relevant information about the car's accelerator: 1. Function of the car's accelerator: In gasoline engines, the accelerator does not control the fuel injection volume but rather the throttle valve opening size. That is, a smaller opening results in less mixture entering the cylinder, leading to lower engine power output, and vice versa. 2. Solutions for a heavy accelerator pedal: A heavy accelerator pedal can be addressed by cleaning the fuel system. Alternatively, try continuing to accelerate to see if the RPM increases but the speed does not. If this occurs, it may be due to a damaged sensor inside the transmission, which locks the overdrive gear.