What could be the reason for the engine being noisier than before?
2 Answers
It may be caused by aging engine mounts. After accumulating high mileage, the engine mounts can deteriorate, and replacing them should resolve the issue. Carbon buildup can also lead to increased engine noise. If the engine sounds normal during operation but the noise inside the car feels excessive, it indicates poor sound insulation. In this case, check the vehicle's sealing strips for signs of aging or consider enhancing the sealing to reduce noise. Increased engine noise is a common occurrence in high-mileage vehicles, and while owners need not worry excessively, they should pay closer attention to maintenance. If the engine produces a dull, slapping sound during operation, it could indicate an issue with the cylinder valves. In such cases, if the noise disappears at high speeds, it is likely due to valve problems. Additionally, check the oil pressure to rule out any related issues.
I think there might be several common reasons for the engine becoming louder, and it's worth careful consideration. Having driven different cars myself, I've noticed that after long-distance trips, the engine noise sometimes increases. Upon inspection, it's usually due to aging engine oil or a loose belt. When oil is used for too long, its viscosity decreases, reducing lubrication effectiveness and causing increased friction noise from components; if the belt is worn or slack, it makes a flapping sound when rotating, which is more noticeable. Additionally, prolonged low-speed driving in urban areas can lead to carbon buildup in the engine, which often results in extra vibrations and unusual noises. In such cases, I usually start by changing the oil and checking the fluid level, while also inspecting the belt for looseness; if the mileage is high, it's also worth considering whether the spark plugs or exhaust pipe are damaged. Overall, don't delay—address these issues early to prevent small problems from escalating, which could affect the entire vehicle's performance and compromise driving safety.
