I have a 2006 Accord VP with 5-speed manual transmission. Recently, I've started to hear a vibration noise when the engine is around 2100-2200 rpm. It isn't very load. In fact, you probably will not be able to hear it if the radio is on. The noise only occurs at the specific rpm, and only while driving through the gears. I cannot reproduce the sound if the car is not moving. The sound reminds me of running a piece of wood through a router. As soon as you past 2200 rpm, the sound goes away.

Any ideas? Thanks

 

Noises are tough to diagnose over the web. I'd start by process of elimination. The issue only happens when the vehicle is moving, so the simplest explanation to test is a tire issue. Try rotating the tires and listen for a change/disappearance of the noise.

 

What does this mean "only while driving through the gears"? Does it change when clutch pedal is push down.

 

“Only by driving through the gears” means accelerating from 1st gear through 5th gear. The noise starts around 2100 rpm and goes away above 2200 rpm while accelerating in each gear. It does not happen when decelerating from a higher rpm through 2200-2100 rpm. It does not happen if I’m coasting at any speed and revving the engine to 2100-2200 rpm while in neutral. The noise is related to engine rpm and only while accelerating. It does not make a difference if I’m accelerating very hard or gently. I cannot reproduce the sound while parked and just revving the engine to 2100 rpm.