Yeah it's weird. I'm glad you posted this cuz I didn't know of any other Accord owners experiencing this until now. I am going to listen to other F22 5th gen Accords at a used car lot and see how they sound. I got that idea a lil while back. Have you found if yours is coming from a certain area of the engine? Mines sounds like it's coming from the timing belt area. I was thinking it might have something to do with the timing belt job becuase I noticed after I got it I also heard a squealing sound. I am going to have some mechanics take a look at it. They listened to it though and said they don't think it's rod knock either. They said it can be something in the timing system like the timing belt tensioner or other possibllities. I'll let you guys know what they say. ItsaHonda, do you feel it in the gas pedal sometimes? If anyone else has noticed this too write a post about it.