My Honda makes this rattling noise. I noticed it only a few times on the freeway a few weeks ago, but it went away after breaking. But now it happens a lot more often, but only most of the time.
I can’t figure out what the common denominator is among the times it does rattle. Any speed, any gear, any rpm, uphill, downhill, flat, a/c on or off. I just replaced the clutch (it needed it, unrelated problem) but it started just before replacing the clutch, and now is worse. Up until today, it would completely stop when I hit the breaks, or even just tapped them (though resume when I lifted my foot). Then today, that doesn’t have the same effect…it takes a lot more pressure/time to make it stop. It seems to be coming from the front passenger side, but sometimes sounds like it could be coming from the passenger back.