I have a 2003 Focus PZEV. The top end seems to have an excessively loud tapping. If It were a push-rod engine I would say it was lifter clatter but when I search with a stethoscope the sound is clearly coming from the fuel injectors. This has bothered me from the time I bought the car in 2005. Ford techs kept telling me it was bad gas. Finally I took advantage of an oil change coupon at a different dealer and the tech listed excessive engine noise. So I am back to thinking that this is not normal. Anyone have any thoughts.