weasel i posted a sound clip....if you pay close attention at about the 33 to 39 second period you will hear the 3 or 4 knocks...it happens when the engine goes to low idle...i will repost the clip..thanks if you hear it let me know what you think...weasel if you search "engine knock" the third one down says cavx5 and it is the first post it is on you tube..thanks