Why Does the Car Exhaust Pipe Make a Loud Rumbling Noise?

[StTravis]

Here are the reasons for abnormal noises from the car exhaust pipe: 1. Exhaust pipe leakage: When there is a leak in the intake or exhaust pipe, the vehicle will produce a loud roaring sound as the exhaust rate increases upon acceleration. 2. Throttle valve clogging: During acceleration, the engine load increases, requiring the throttle valve to open wider and increase fuel supply. If the throttle valve does not open to the optimal position due to clogging, it will result in poor air-fuel mixture ratio in the engine, causing noise during acceleration. Additional information: Apart from roaring sounds, the engine may also produce a humming noise during acceleration. Possible causes for this sound include: 1. Transmission issues. The humming noise during acceleration may not always come from the engine; it could also be due to worn transmission bearings or insufficient lubrication, leading to friction. 2. Engine problems. If the humming noise is indeed from the engine, check if the RPM is very high. If the RPM increases significantly while the vehicle speed rises slowly during acceleration, this usually indicates clutch slippage, requiring replacement of the clutch assembly.

[VivianAnn]

I've been driving for twenty years and have encountered rumbling exhaust system noises several times. It's usually due to a damaged muffler causing exhaust gases to exit unevenly, creating noise. This happens when the soundproofing material inside the muffler ages or develops holes. It could also be caused by loose or rusted/cracked connections in the exhaust pipe, allowing gas leakage and producing a low-pitched sound, especially noticeable during acceleration. Sometimes, engine issues like uneven ignition can also affect exhaust balance and create noise. I recommend car owners immediately inspect the exhaust tailpipe for visible damage, locate the problem source by listening to the noise, and avoid delaying repairs as this can affect fuel efficiency and even vehicle lifespan. It's best to visit a professional auto repair shop for equipment diagnosis and repairs—safe driving is crucial.