hey guys, I have a 2010 G37x Coupe, back in august I took it off the road because of a major knocking sound. I wanted to believe it was pre ignition, but I have changed the plugs and still the same. I then thought maybe a vvt lift actuator, but it seems to aggressive of a knock compared to other peoples videos. So im led to believe it is a spun rod bearing, But I find it odd that it only knocks after 1500 rpm. if anyone has any insight that would be much appreciated. ive attached youtube link.

 

Toast man.

 

I have to agree.