Why is the Civic's engine noise loud during acceleration?

[Diaz]

The reasons and solutions for the loud engine noise during acceleration in a Civic are as follows: Engine Mount Deterioration: After high mileage, the engine mounts may deteriorate. Replacing the engine mounts can resolve this issue. Seal Deterioration: If the engine sounds normal from the outside but the noise is loud inside the car, it indicates poor sound insulation. Check the vehicle's seals for any signs of deterioration. Alternatively, improving the vehicle's sealing effect and then testing the noise level can help. Cylinder Valve Malfunction: If the engine produces a dull, slapping sound during operation, it might be due to a problem with the cylinder valves. In this case, the noise may disappear when driving at high speeds.