Not quite on a Honda, but my corolla beater is rattling at the front bumper, to a point that it is louder than the inter-state 18 wheeler. When I put my hands on the bumper it quiet down a bit. I can hear it while driving too and it quiet down a lot when warmed up. Could it be just the bumper getting loose, or is the engine mount bad as well? I don't really feel the bumper is shaking when the engine is stopped and I try to move it by hand.