When the accelerator of my car accelerates, it makes the sound of a sports car. When the throttle is off, there is no sound. What happened?

According to your description of the fault phenomenon, it is likely that the clutch part is broken.

When you step on the accelerator, the vehicle doesn't work hard. This is a slip phenomenon. Most clutch plates are worn thin and rustle. It is likely that the release bearing of the clutch is broken.

Lack of motivation mainly has the following possibilities:

1. Is the transmission system resistance too large? For example, the handbrake is not released and the brake is stuck. Check whether the car is running off and the wheels are overheated. Or ask the master to slide on the flat road to see if the distance is too short.

2. It may be that the oil in the oil supply system is too thick or too thin. See if the exhaust gas has color and the water temperature is high. Black smoke is too thick, blue smoke is oil leakage, and white smoke or too much water is cylinder gasket.

3. The gas path of the gas supply system is blocked and cannot be maintained normally. See if the air filter is dirty, the throttle valve is greasy, and there is no vacuum tube falling;

4, the circuit is generally not broken, and there is generally no ignition angle error without disassembly timing. See which sensor wire is loose.