I heard the sound. It sounds like either the timing is off, or something came apart on the top end.
Have you removed the valve cover to see if there is anything damaged? Note: If the timing is off, this is an interference engine and internal damage will result.
I would remove the valve cover and inspect the top tensioner guide and for anything that has come apart. Make sure there isn't play in the cam bearings.
If everything checks well, then remove the spark plugs and get your hands on a scope. Check in each cylinder to check if there is damage to the tops of the pistons or the valves.
Let me know what you find.
Monday, October 10th, 2022 AT 8:09 PM