Kaia Grgich San Francisco, California - 2001 Ford Focus
An engine question. When she steps on accelerator, moving or not, hears "flapping" sound--like baseball card in spokes. May go away above 40 mph, or just get drowned out. Replaced engine a while back, but that has nothing to do with this. It could be pump, or a belt disintegrating, possibly the timing belt, which would be very bad--so get it looked at.