Why does the car engine suddenly become louder?
2 Answers
The reasons for a sudden increase in engine noise are as follows: 1. Deterioration or loosening of engine mounts. Engine mounts are rubber blocks placed between the engine and the frame to reduce vibrations and provide cushioning during engine operation, as well as to secure the engine. Once these mounts deteriorate or become loose, the engine will vibrate, and the faster the speed, the louder the vibration noise. 2. Improper use of engine oil. If the viscosity of the oil does not match the engine, it can easily lead to carbon buildup, causing the engine noise to increase. 3. Engine misfire. The exhaust gas flow from the car shows obvious intermittency, and the exhaust pipe shakes violently, making it easy to hear abnormal engine noises. 4. Cold start. During a cold start, the engine's lubrication is poor, the oil flow is sluggish and thicker, leading to abnormal noises from mechanical wear.
The day before yesterday, my car's engine suddenly became much louder than usual, which really startled me. Possible reasons include a leak in the exhaust system, such as a loose or broken exhaust pipe connection, causing gas to escape and increase noise; or low oil level, where insufficient lubrication increases friction between internal components, naturally making the sound louder; it could also be due to aging belts, causing squeaking noises. I immediately stopped the car and checked the oil dipstick—sure enough, it was a bit low. After adding some oil, the noise reduced significantly. Also, don’t forget about spark plug issues—excessive carbon buildup can cause poor ignition, leading to increased noise. In such situations, don’t force yourself to keep driving. First, find a safe place to check basic components to avoid damaging the engine core. Addressing the issue early saves both peace of mind and money—don’t wait for the problem to escalate.
