What Causes the Buzzing Noise and Resonance in CR-V?

[LillianDella]

CR-V buzzing noise with resonance is caused by tensioner pulley wear and exhaust pipe deformation. Details are as follows: Tensioner Pulley Wear: The tensioner pulley's function is to keep the engine belt tight, preventing the alternator and power steering pump from slipping. Due to prolonged pressure and high-speed rotation, the bearing inside the tensioner pulley is prone to wear, resulting in noise and resonance. If the buzzing and resonance are confirmed to be caused by the tensioner pulley, the engine mount bushings should also be checked, as their role is to dampen engine vibrations and noise. Exhaust Pipe Deformation: In most front-engine vehicles, the exhaust pipe runs from underneath the car to the rear. Driving on rough roads or impacts to the undercarriage can easily cause the exhaust pipe to dent or deform. A deformed exhaust pipe increases exhaust resistance, leading to buzzing noises and resonance.