What is the abnormal idling noise of FAW-Volkswagen new Jetta hot car?

Abnormal idling sound: Hello, if it is a slight click sound, this is the sound that the throttle valve is working normally.

If the noise is loud, it is necessary to check the valve clearance and clean up the carbon deposit on the throttle.

it should be

Two reasons:

1、

Cold weather

Oil is relatively concentrated.

When it first started,

Abnormal sound caused by poor lubrication of various parts.

2

This car is old.

Abnormal sound () is caused by excessive clearance between parts when the car is cold. 3, hot car abnormal sound, should be a hydraulic operation failure, check and replace the hydraulic tappet.