What is the reason for the abnormal sound of automobile throttle?

The following are the specific reasons for the abnormal sound of the automobile fuel filler door: 1, and the failure of the exhaust part: the sound caused by the air leakage of the exhaust interface pad or the air leakage of the exhaust pipe perforation. 2. Intake part failure: the intake manifold or throttle body is partially leaked or the seal is not tight. 3. Failure of engine chassis parts: Abnormal noise means abnormal noise from accessories inside the engine or around the engine body, or abnormal noise from chassis parts due to loose accessories or vibration interference. 4. Internal causes of transmission failure: such as abnormal noise caused by lack of oil or abnormal wear during driving.