What Causes Loud Engine Noise in Sedans?
2 Answers
Reasons for loud engine noise in sedans: 1. Engine mount aging or loosening: Once the engine mount ages or becomes loose, the engine will vibrate, and the faster the speed, the louder the vibration noise. Solution: Tighten or replace the engine mount; 2. Improper use of engine oil: If the viscosity of the engine oil does not match the engine, it can easily cause carbon buildup, leading to increased engine noise. Solution: Use the engine oil grade specified in the vehicle manual and avoid mixing different brands of engine oil; 3. Engine misfire: This mainly refers to one or more cylinders in the engine not working properly, typically manifested as obvious intermittent exhaust flow and severe shaking of the exhaust pipe, with a clear popping sound from the engine. Solution: Check the working condition of each ignition coil and cylinder spark plug.
I've been driving for over twenty years and have encountered many cases where the engine noise becomes louder. Usually, it's due to an exhaust system leak or a faulty muffler—those buzzing sounds are particularly noticeable. It could also be because the engine's internal chains or belts are loose or worn, especially when the engine oil is old or insufficient. Inadequate lubrication leads to increased friction, naturally making the noise louder. When starting the engine in cold weather, the sound can be even harsher, so it's advisable to warm up the engine first. If the noise persists, it's best to check the oil dipstick and try changing to fresh oil. If that doesn't help, take it to a professional shop to avoid minor issues turning into major repairs. Ignoring such noises for a long time not only increases fuel consumption but may also damage the cylinders, severely affecting the vehicle's lifespan.
