I dont think it is, but i need all your help just so i stop worrying. It only happens what at very low RPM's, (1000). there is a metallic fast ratteling for a split second and then goes away. Nothing all the way up to 5800 RPMs. I have never heard a car that pings, and i just want to make sure that my car isnt doing that. The sound happens all the time. its not every once and a while. And correct me if im wrong, but doesnt pinging usually happen under full throttle and higher in the RPM's for a longer time than a split second? thanks for the help.