The air inlet of diesel pickup truck suddenly made a sound.

There are two possibilities: 1, the intake manifold or various valves leak; 2. There is too much scale on the throttle and air intake.

If the intake of the engine is incorrect, the mixture will be too rich or too thin, which will make the engine burn abnormally. Will lead to engine idling jitter.

There is too much carbon and dirt in the throttle and the surrounding air intake, and the cross-sectional area of the air passage changes, which makes the control unit unable to accurately control the idle intake, resulting in the mixture being too rich or too thin, which makes the combustion abnormal. When the position of air leakage affects the vacuum degree of the engine, the engine will shake violently, which has a great influence on the idle speed of the cold car.