tezcatlipoca
Junior Member
Good morning everyone. I have a sudden problem with the 3.7 engine in my 2013 Mustang. Yesterday, while overtaking a tractor in manual mode, I heard a knocking sound. It's a metallic, rhythmic knocking from under the hood. It appears at around 2000 rpm and disappears around 4000 rpm. There's no knocking at idle. The oil level is fine, there's no lack of power, and there's no idle fluctuation. I'm including a link to a recording of the sound. What could it be? Crankshaft bearings or rod bearings?
