2014 Dodge Dart Single Engine ping on startup

I have recently been experiencing a single metallic ping on startup of the vehicle (immediately after crank/turnover of engine) after it has been sitting overnight or for extended periods of time. Once the initial ping happens you cannot replicate it until it a few hours or more have passed of the vehicle sitting. The vehicle runs and drives fine with no knocks or pings while driving and I have had no loss in power from the vehicle.