OK if I had a droped valve seat dont you think that should trash my turbo? Because that was the first thing I had checked, And the turbo was fine the hot side was all good no damage. The dealer is ripping the head off today. I talked to the tech that was working on it and he said he could tell that it was a dead cylinder just by listening to it, wish I had those skills. So I really dont know what is wrong with it until they take the head off.