25-10-2021, 09:07 AM
It is difficult to diagnose an engine noise when you have not heard it. I would be inclined to remove the engine and strip it for careful examination. Sometimes the merest play in a component can give rise to the most horrendous noises. Some little time ago, my own car developed a sharp knocking noise, which eventually turned out to be the slightest of movement in one gudgeon pin. A new set of pistons cure the problem.