What is the reason for the noise when the automobile engine is idling?

The loud noise at idle speed may be caused by the following reasons:

1. The oil pressure is unstable. Check the oil pressure? ;

2. Engine carbon deposit, cleaning throttle and cleaning fuel injector? ;

3. The ignition system problem, check the ignition coil and spark plug;

In-car entertainment interaction suggests that you pay more attention to timely maintenance when driving, and solve problems in time.

You can try to clean the throttle, because cold cars are easy to accumulate carbon in summer and autumn, and it is easy to produce abnormal noise if you don't clean the throttle for a long time.

The engine is idling loudly (when the hood is open), so listen carefully to the sound source. Check whether the exhaust pipe is broken.

Try to hold it with a big screwdriver.

At the exhaust pipe, if the engine sound drops obviously, the exhaust pipe is damaged.

To clean the throttle: