The air cleaner box is noisy when Corolla is idling.

There should be two reasons: 1, the cold engine oil is cold, and the lubrication of the parts is not in place at first, resulting in abnormal noise. 2. The car is old and cold, and the gap between parts is too large, resulting in abnormal noise.

Toyota Corolla dithered at idle speed, and the car idle motor stepped on the gas pedal kitchen conveyor belt. It is mainly used to bear the idle speed of the car, and its purpose is to adjust the idle speed according to the engine load at idle speed. Idle jitter can check the pointer fluctuation of idle meter, which is generally manifested as poor combustion. If it is a new car, there is basically no problem of damage to idle parts, because the combustion requirements of turbo direct injection vehicles are difficult, so it is better to clean the oil circuit first. Before the idle pointer fluctuated, after adding Sipu's fuel additive to the fuel tank, two tanks of oil were shaken at idle speed.