What Causes Loud Engine Noise During Acceleration?
2 Answers
Engine noise during acceleration can be caused by exhaust pipe leaks, dirty throttle valves, engine misfires, or transmission issues. Exhaust pipe leaks: When there is a leak in the intake or exhaust pipe, the vehicle produces a loud roaring sound as the exhaust flow rate increases during acceleration. Dirty throttle valve: During acceleration, the engine load increases, requiring the throttle valve to open wider and more fuel to be injected. If the throttle valve fails to open to the optimal position due to dirt buildup, it can result in poor air-fuel mixture ratio, causing noise during acceleration. Engine misfire: Engine misfire refers to one or more cylinders not functioning properly, typically manifesting as insufficient power, severe exhaust pipe vibration, and clearly audible "popping" or "thumping" sounds from the engine. Transmission issues: The buzzing sound during acceleration may not always come from the engine; it could also be due to worn transmission bearings or insufficient lubrication fluid, leading to friction. To address loud engine noise during acceleration, you can replace the exhaust pipe, clean carbon deposits from the throttle valve, inspect the condition of ignition coils and spark plugs in each cylinder, add lubrication fluid to the transmission, or install soundproofing equipment in the vehicle.
Having driven many cars, there are several possible reasons for loud engine noise during acceleration. Issues with the exhaust system, such as a broken muffler or a perforated exhaust pipe, can allow sound to escape directly; a loose or aging engine belt can also cause a buzzing noise. Problems with the fuel system, like insufficient oil pressure or dirty engine oil, can lead to inadequate lubrication and increased friction between parts. Even carbon buildup in the cylinders can cause uneven combustion. It's recommended to regularly check the belts, change the engine oil, and avoid aggressive driving. Noise may be more noticeable when going uphill, and neglecting these issues can increase fuel consumption and wear. Additionally, the causes of noise differ between new and old cars—my old car once made noise due to loose mounts, but it became quiet after a minor repair.
