[MarkR171]

Update 9/21/2016 - Knocking came back while driving normally to lunch today.

Called up the service manager at the dealer that handled the car the first time. Brought the car in and he and one mechanic listened to the car and confirmed it sounds the same as 6 months ago. They're going to get Toyota involved again. Last time, Toyota recommended they take a new car and start swapping parts over to mine until everything was resolved. Hopefully this time they just give me a new engine.