Why is the engine noise loud inside the car?
2 Answers
Here are the reasons for loud engine noise inside the car: 1. Weather conditions: Cold weather causes the engine idle speed to increase, and the cold engine maintains high RPM. 2. Loose plastic parts in the engine compartment: Such as the engine cover, intake pipe, etc., which can be fixed by tightening. 3. Incorrect engine oil condition: When the viscosity of the engine oil is too high, it can easily cause problems in engine operation, reduce lubrication, leading to friction during engine operation and resulting in noise. 4. Valve leakage: During the reaming of the valve seat, improper operation or excessive wear of the valve guide inner hole can cause the valve seat to tilt or the valve clearance to be too small, leading to valve burning and resulting in poor valve sealing and leakage.
When the engine noise suddenly increases, I always consider recent changes in the car's condition first. Possible causes vary: worn bearings can produce a harsh metal grinding sound; damaged engine mounts can transmit vibrations to the cabin; exhaust system leaks may sound like a 'hissing' wind; insufficient oil reduces lubrication and increases friction noise. Additionally, deteriorated soundproofing materials falling off can make the engine sound clearer. I recommend checking simple components first: see if the oil dipstick is at the normal level and if the air filter is dirty or clogged. If the noise is noticeable during startup or acceleration, it might be an issue with the ignition system or belts. For safety, visit a professional repair shop early for diagnosis to prevent minor issues from turning into major repairs. After all, a quiet drive is comfortable and safe. Remember, regular maintenance can effectively prevent such problems, such as changing the oil every 5,000 kilometers.
