Engine knocking noise please help any suggestions would be highly appreciated please and thank you on a cold start up the noise is barley audible but one car is warm this is what happens
https://youtube.com/shorts/PSs92ebqJh8

 

There’s nothing to fix . It’s an internal engine knock .

Drive it till it needs a new engine . You aren’t going to spend $8000 to open up the engine and rebuilt it , it’s way cheaper to buy a good used engine and have someone swap it in

 

There are two different (but related? sounds. First is a valve train maladjustment a loose tappet, possibly from worn thrust piece. The second is much deeper and more difficult (and costly) to repair.
It is something with a piston--either hitting combustion deposits or connecting rod bearing.

 

You just might have an exhaust leak somewhere. Even a minor leak will cause engine ticks and knocks to escape. The bigger leak the more it sounds like a tractor.