What Causes the Puttering Sound When the Car is Running?

[SanElliott]

Engine mount aging or loosening: Engine mounts are the rubber blocks between the engine and the frame. Improper use of engine oil: If the viscosity of the engine oil does not match the engine, it is easy to produce carbon deposits, causing the engine noise to increase. Engine misfire: Engine misfire mainly refers to one or more cylinders of the engine not working properly. It is usually manifested by obvious intermittency in the exhaust gas flow from the car, accompanied by severe shaking of the exhaust pipe, and a clear "puttering" or thumping sound from the engine.