What Causes the Engine Noise to Increase in Small Cars?
2 Answers
Car engine noise increases due to engine overheating. Engine produces a sound similar to "puffing": The unpleasant engine noise is most likely caused by the engine being either too hot or too cold, and there is also a high probability of low oil levels. Engine overheating leads to loss of engine power: If the engine operates for an extended period, causing the surface to overheat, the cooling system may fail. The first step in this situation is to check the cooling system. If the cooling system malfunctions, it could lead to exhaust blockage, as the vacuum tube might break. At this point, steam or hot air may escape from the engine, producing a "hissing" sound.
I've been driving for over a decade and have encountered many cases of increased engine noise. The most common causes are loose or worn drive belts – when the rubber deteriorates, it produces a high-pitched squeal, especially during acceleration. Exhaust system issues are also frequent; rusted leaking pipes or loose connections can amplify the roaring sound. Engine oil is another critical factor – insufficient lubrication from overdue changes or thickened oil leads to noisy engine operation, something I've witnessed in many vehicles. Worn valves and piston rings increase internal friction and noise. Additionally, a clogged air filter makes the engine work harder to intake air, naturally increasing sound levels. If the noise is worse during cold starts, it might be temperature affecting oil viscosity. Overall, changing engine sounds are important warning signs – don't ignore them. Early inspection of belts and oil at a repair shop can prevent major damage. Regular maintenance like biannual belt checks and frequent oil changes helps prevent these issues – safety always comes first.
