What Causes a Muffled Sound in a Car Engine?

[OJordan]

Car engine sounds muffled due to: 1. Excessive carbon buildup in the engine, primarily caused by incomplete absorption of gasoline into the engine, leading to carbon deposits; 2. Mismatch between engine oil quality and the engine's requirements, where overly viscous oil can increase fuel consumption and cause carbon buildup; 3. Long-term neglect in cleaning the throttle body or fuel injectors, overdue replacement of spark plugs, or even faults in the intake manifold or engine misfiring. An engine is a machine that converts other forms of energy into mechanical energy, applicable both as a power generation device and as the entire machine including the power unit.