There is abnormal noise when stepping on the accelerator, but not when releasing the accelerator.

The throttle disappears for the following reasons:

1, which is mainly caused by air leakage in the intake pipe or excessive valve clearance. When we step on the accelerator, the air intake of the vehicle will increase, and the high-speed air will be ejected from the gap of the intake pipe, producing noise similar to whistle or whistle. In this case, you should go to the repair shop for inspection and repair in time, and the replacement must be replaced.

2. Possible consequences: Because the air sucked into the engine from the gap of the intake pipe does not pass through the air flow sensor, this part of gas will dilute the combustible mixture in the engine cylinder, which will lead to the symptoms of engine failure.

3. The air intake system consists of an air filter, an air flowmeter, an intake pressure sensor, a throttle body, an additional air valve, an idle speed control valve, a resonant cavity, a power cavity and an intake manifold. Also pay attention to the maintenance of the air intake system, replace the air filter in time, and clean up the carbon deposit in the air intake system.

Stepping on the accelerator will make the throttle sound loose and disappear. The solution is as follows:

1. Component damage: the automobile oil pump or clutch release bearing may be damaged. Solution: Go to the repair shop for inspection and repair, and replace parts.

2. Installation error: whether the engine intake pipe leaks air and whether the air filter element is installed correctly, it is necessary to observe where the hiss is. If it appears on the right side of the engine, there is something wrong with the belt of the engine; If it appears on the left side, there is something wrong with the throttle. Solution: Fix and adjust the abnormal problem.