1989 Honda Accord LX-i liftback with under 200k on the ODO.
On a recent trip I noticed a rhythmic grinding sound. Not even a sound, I felt it in the floor under my foot. As I kept driving it worsened over the next couple days:
It is rhythmic and speeds up as the car goes faster; No relation to engine RPMs.
It only happens while the car is in gear. If I'm flying along and pop it into neutral, it goes away. Comes back when in any gear.
It does not seem to change much whether the car is turning or not. Maybe a little, but I might be making it up.
I do not feel the grinding in the shifter or steering wheel. Just in the floor but can hear it's louder now, too.
I drained the transmission expecting I might see metal flakes come out, but fluid was more or less clean. I don't think it's wheel bearings because that noise would happen regardless of whether or not I was in gear, right? Is it the CV joints? Is there a way to tell without replacing them and trying to drive? I did some searching through these forums and saw some posts that were similar to my issue, but not identical...