What are the reasons why a car doesn't accelerate when stepping on the gas?

[LaAshley]

Car acceleration failure when stepping on the gas can be caused by: 1. Throttle malfunction or excessive carbon buildup; 2. Fuel supply system failure; 3. Poor fuel quality. The functions of the accelerator pedal are: 1. Controlling engine speed by adjusting pedal depression; 2. Regulating carburetor to determine engine output power. The working principle of the accelerator: When depressed, it directly controls the throttle valve - increasing its opening allows more air into the engine, prompting the ECU to command the fuel injection system to increase fuel delivery, thereby raising engine RPM and achieving vehicle acceleration.