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Buzzing Noise During Car Acceleration

2 Answers

StMolly

07/29/25 1:49am

Acceleration with a buzzing noise may be caused by the following reasons: 1. Transmission noise: One of the main sources of noise could be friction within the transmission, possibly due to worn transmission bearings or insufficient lubrication fluid. The transmission is one of the more precise and complex components in a vehicle. If there is noise during driving that disappears when the clutch pedal is depressed, it is likely an issue with the transmission components. The gear teeth in the transmission are usually loosely fitted on the shafts, which are equipped with needle bearings. If the rolling bearings of a particular gear are damaged, the meshing will be affected, leading to noise due to the lack of radial positioning. 2. Valve noise: A 'ticking' sound from the engine after starting, especially when the engine is cold, is typically valve noise. This occurs because the oil pressure hasn't built up yet, and the valves aren't properly lubricated. The sound usually subsides after a short while. 3. Engine issues: If the buzzing sound is indeed from the engine, check if the RPM is unusually high. If the RPM increases significantly during acceleration while the vehicle speed rises slowly, this usually indicates clutch slippage, requiring replacement of the clutch assembly.

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DiColton

08/12/25 5:52am

Recently I encountered a similar issue - the annoying humming sound during acceleration is usually caused by unbalanced tires, with vibrations transferring to the cabin at high speeds. Worn wheel bearings are also common, with the humming sound increasing with speed, and in severe cases the wheel might even lock up. It could also be wind noise - faster airflow during acceleration, so check if door seals or exterior trim are loose. I suggest first identifying the sound source: front could indicate loose engine belt, rear might suggest exhaust leak. You can check tire balance yourself at a tire shop to save time and money, but safety first - older cars should get comprehensive inspections to prevent accidents.

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