A Rattling Pinging Noise is usually caused by an air fuel mixture in the engine cylinder. That is being ignited early, by the heat of compression.
Engine Noise – The First Step Is Locating The Source Of The Noise
Many drivers just ignore engine noise and hope that, it’ll just go away on its own. Chances are it won’t, and that engine noise will only get worse, leaving you with an even bigger problem. […]