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What is the buzzing sound when stepping on the accelerator?

2 Answers

ElliottLynn

07/29/25 4:29am

Buzzing sound is the friction noise of components during engine operation. Main causes: Lack of engine oil inside the engine; Engine oil not changed for a long time; Engine oil viscosity too low. The following are the main functions of engine oil: 1. Lubrication and friction reduction: There is rapid relative sliding between pistons and cylinders, as well as between main shafts and bearing bushes. To prevent excessive wear of parts, an oil film needs to be established between the two sliding surfaces. A sufficiently thick oil film separates the surfaces of relatively sliding parts, thereby achieving the purpose of reducing wear. 2. Cooling: Engine oil can bring heat back to the oil tank and then dissipate it into the air to help the radiator cool the engine. Good engine oil can bring carbon deposits, sludge, and worn metal particles on engine parts back to the oil tank through circulation, and flush away dirt generated on the working surfaces of components through the flow of lubricating oil.

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LaHayden

08/12/25 8:12am

I've been driving for nearly thirty years, and I've encountered throttle buzzing sounds quite often. This kind of noise usually occurs between 1500 and 3000 RPM and is typically caused by mechanical component resonance. The most common cause is the aging of engine mount rubber, which loses its damping effect, allowing engine vibrations to directly transfer to the frame. Another possibility is an air intake pipe leak, especially in older cars where pipe joints are prone to cracking and leaking. Damage to the front exhaust pipe gasket can also produce a low-frequency buzzing sound during acceleration. Additionally, wheel bearing wear to this extent can produce similar noise, but the difference is that bearing noise changes with vehicle speed, while throttle noise changes with engine RPM. I suggest you first try revving the engine in neutral to listen for sound changes, as this can help preliminarily determine whether it's an engine issue or a drivetrain problem.

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