What Causes the Exhaust Pipe to Make a Puffing Sound and Shake?

[SanKeegan]

The reasons for the exhaust pipe making a puffing sound and shaking are: 1. The air-fuel mixture is too rich, and unburned mixture enters the exhaust pipe, encountering fresh air and causing backfire; 2. Poor valve sealing, leading to incomplete combustion; 3. Some exhaust valves are eroded or have poor sealing; 4. Carbon deposits at the contact surfaces between some intake/exhaust valves and their seats; 5. Some valve lifters have no clearance, or the two idle ports of the dual-barrel carburetor are unevenly adjusted or clogged; 6. The exhaust pipe is damaged, unable to muffle noise or purify emissions. The maintenance methods for the exhaust pipe are: 1. Avoid water entering the muffler when driving in rain or washing the car; 2. Regularly clean dirt inside the exhaust pipe.