What causes the buzzing electrical sound after starting the car?

[AdalineAnn]

The reasons for the buzzing electrical sound after starting the car are: 1. If the car has not been moved for a long time, the engine oil will return to the oil pan, causing a buzzing sound due to insufficient oil sealing and lubrication of the valves during startup. This is a normal situation; 2. Abnormal noise from the belt during startup. In this case, it is necessary to promptly check whether the belt has any issues. If there is abnormal noise from the belt, first check the assembly. The noise may be caused by friction between the timing belt and the timing cover. You can loosen the screws on the timing cover by half a turn to see if the noise disappears. Secondly, check the condition of the generator belt, as the noise may come from the accessory belt. If the timing belt tension is adjusted too tightly, remove the generator and air conditioning power steering belts to determine if the issue lies with these belts.