[Shane@DBPerformance]

Rod knock will usually make a somewhat hollow almost wooden sounding knocking noise on decel, like it you rev it up quick and then it decel back down on it's own. You can also then unplug each injector 1 at a time and see if the noise changes on any specific cylinder. The rod knock noise should get quieter on the cylinder with the spun bearing with no combustion happening/less load on it.