superexpy
Full Access Members
I would check spark plugs make sure none are loose. It could launch one if she is loosening up.
Rod knock typically gets worse with load. Could be exhaust hitting somewhere due to bad motor mounts, etc... Cam follower tensioners "lifters" knock is usually less severe in sound. It could be intermittent. Also if timing chain guides or tensioners are failing the timing chain could be hitting the timing cover. Injectors can be noisy as well.
Agreed with Toms89! Alot of the time I have seen this issue its a loose plug.