What Causes the Popping Sound from the Exhaust Pipe When Starting a Car?

[DelJackson]

Abnormal sounds from the exhaust pipe are mainly caused by an excessively rich or lean air-fuel mixture. The reasons for and solutions to abnormal sounds from a car's exhaust pipe are as follows: 1. Damaged exhaust pipe: The engine exhaust emits high-temperature and high-pressure exhaust gases, along with some backfire explosions. In this case, the exhaust pipe needs to be replaced immediately. 2. Engine misfire: In a multi-cylinder engine (most car engines are four-cylinder), the exhaust processes of each cylinder are interconnected. If one cylinder stops working, the exhaust sequence will be disrupted, causing abnormal sounds from the exhaust pipe. In this situation, professional repair personnel must be consulted for repairs.