I have a 2.5 Duratech atx. 30k miles had a slight marble in a can rattling on slight throttle. Got worse and louder and occured at all rpms higher than 2k. Took it to the dealer. They said they didn't hear squat. They must be deaf there. But the said they reprogrammed it and there was a TSB out about pinging.
Still pings a little. Rarely though. Its only been 2k miles since the reprogramming.
