Why is the engine sound louder than before?
3 Answers
Engine sound louder than before is caused by excessive carbon deposits in the engine, inappropriate engine oil usage or dirty engine oil. Below are detailed explanations of the causes and solutions to this problem: Excessive carbon deposits in the engine: Excessive carbon deposits in the engine can lead to incomplete combustion, unstable idling, shaking, and is often accompanied by increased noise. It is recommended to regularly clean engine carbon deposits to maintain good performance. Inappropriate engine oil usage or dirty engine oil: Inappropriate engine oil usage or dirty engine oil can prevent the lubrication and protection functions of the oil from meeting requirements, resulting in increased engine noise. It is recommended to choose engine oil with the appropriate viscosity and grade, and perform regular maintenance.
I've been driving for many years, and sudden engine noise increase is quite common. The most frequent causes are insufficient or poor-quality engine oil, which reduces lubrication and increases friction between engine components, leading to louder noise. Exhaust system issues, such as aging mufflers or leaking exhaust pipes, can also produce a whooshing sound from escaping gases. Belts are another critical factor—loose alternator or air conditioning belts can create squealing or dull noises during high-speed operation. Additionally, a dirty air filter restricts airflow, making the engine work harder and naturally louder. Prolonged neglect not only causes discomfort but may also damage internal engine components. It's advisable to promptly check the oil level and identify unusual noise locations. If simple maintenance doesn't resolve the issue, seek professional inspection at a repair shop to avoid breakdowns or hazards on the road.
As an ordinary office worker, last time my car had loud noises during cold starts, and later I found out it was due to excessive carbon buildup, causing incomplete combustion and increased engine vibration. During daily driving, there was a buzzing sound when accelerating, and upon inspection, it turned out the fuel system was dirty, with clogged fuel injectors leading to unstable operation. Regular oil changes and maintenance can help alleviate this, but I also think seasonal factors matter—cold weather tends to make the noise worse, while it improves in warmer conditions. Additionally, driving habits have a big impact; aggressive acceleration or heavy loads can amplify the noise. A simple solution is to listen to the source of the sound: if it's a rhythmic tapping, it might be a valve issue, while a continuous hum could indicate a bearing problem. Addressing it early saves hassle and money—unlike my previous experience where I almost ended up spending on part replacements.
