Siegelj8013
CEG'er
Update: The car made the 500 mile trip home from vacation yesterday. The noise does not seem to be any worse. A good friend with lots of mechanical wisdom was looking at the engine with me and said it did not sound so bad. He said it kind of sounded like the noise was coming from the bottom end but could not really tell. He said it could be anything. The car still pulls really hard and drives well. There is some hesitation down low sometime though, but that could be an O2 sensor. I still can't figure out this knock!