So I have a 2007 Honda Accord EX V6 AT with approx 196,000 miles on it.

I’m driving today and notice a random buzzing sound while accelerating. I only hear it when accelerating. The sound lasts for approx 5 seconds and then goes away. It will reappear at random times.

I made a trip to advance auto parts and battery, starter, and alternator passed. I’m no car expert by any means, but I figured I’d start with a common free test.

Any idea on what the buzzing could be?

Any help is appreciated.

 

Hard to say but following are possibilities:

1) serpentine belt tensioner bearing, idler bearing, alternator bearing, PS bearing. Suggest removing belt to see if sound is missing. While belt is off check bearings for roughness.

2) exhaust leak or exhaust shield resonance - inspect exhaust

3) Timing Belt idler/tensioner bearing - listen carefully w/ stethoscope for noise inside the lower TB cover.

good luck