What Causes the Buzzing Noise When Accelerating That Stops When Letting Off the Throttle?

[OLucille]

The reasons for the buzzing noise when accelerating that stops when letting off the throttle are: 1. The accessory belt of the car is too loose, causing increased load and belt noise when accelerating; 2. Carbon buildup in the car's throttle body leads to poor throttle response, and the idle control valve and throttle plate are too dirty; 3. There is a mixture of carbon deposits and engine oil in the car's engine intake tract, causing a buzzing noise when accelerating. The solutions are: 1. Check the generator belt, compressor belt, power steering pump belt, etc., and replace or tighten them if loose; 2. Inspect the car's throttle body, clean and recalibrate if dirty; 3. Clean the mixture of oil and carbon deposits in the intake tract using a specialized intake tract cleaner; 4. Check if the throttle pedal spring is loose or fatigued, and replace it as soon as possible if necessary.