Kia Sorento Engine Noise

I’m Trying To Diagnose This Metallic Thumping/rattling Engine Noise On A 2014 Kia Sorento V6 3.3l And Would Really Appreciate Some Advice...

The Engine Was Once Opened By The Mechanics But Now It Has No Pressure And Makes Some Noise When On Operations.

2005 Kia Sorento Is Making A Popping Noise. Can Only Hear It In The Cabin Not Outside Under The Hood. The Noise Starts And Stops Sporadicly...