What causes loud engine noise?
2 Answers
Loud engine noise in a car is often caused by issues with engine oil or the oil filter, which can be resolved by changing the oil or cleaning the oil filter. Engine oil and oil filter malfunctions: The engine requires oil for internal lubrication. If there are problems with the oil or the oil circulation system, or if the oil filter is faulty, lubrication efficiency decreases, resulting in louder engine noise. Oil cooler malfunction: The oil cooler's function is to cool the lubricating oil, maintaining the oil temperature within the normal operating range. In high-power performance engines, due to high thermal loads, an oil cooler must be installed. During engine operation, as oil viscosity decreases with rising temperature, lubrication capability is reduced. Therefore, some engines are equipped with oil coolers to lower oil temperature and maintain proper oil viscosity. The oil cooler is positioned within the lubrication system's oil circulation circuit.
I've been driving for over a decade and have encountered several instances where the engine noise suddenly became louder. Most of the time, it was due to insufficient engine oil – less lubrication means more friction, which naturally leads to louder sounds. If you check the dipstick after parking and find the oil level below the minimum mark, you should add oil immediately. Another possible cause is an exhaust pipe leak or a worn-out muffler, which can create a rumbling noise when starting the engine. Loose belts are also common, especially when the air conditioning is on, producing a squeaky, screeching sound. Older cars are more prone to noise issues, but regular maintenance can help prevent them, such as changing the oil and inspecting the belts every 5,000 kilometers. Carbon buildup on spark plugs can also cause knocking sounds, which sound like crackling. Don't ignore these small issues, as they can accumulate and potentially damage the engine. Addressing them early saves hassle, money, and ensures safety.
