What causes abnormal noise when accelerating and the car speed not increasing?

[LeSerenity]

The main reasons for abnormal noise when accelerating and the car speed not increasing are as follows: 1. Engine misfire: For example, if the ignition coil of a certain cylinder is damaged, causing the engine to change from 4 cylinders to 3 cylinders, the fuel efficiency of the engine is very low at this time, and the output torque value of the engine is small; 2. Problems with the engine fuel pump: Damage to the engine fuel pump leads to insufficient fuel supply, where the engine speed increases but the fuel injection volume is very low, resulting in very low output power. The accelerator is also known as the 'throttle' or 'gas pedal', and refers to the control device that regulates the engine power (thrust).