I just picked up an 04 3.3 with what I can best describe as a knock/rattle on the passenger side of the engine. It has 160K, ONE OWNER and has a pretty good service record history as far as routine maintenance goes. The previous owner stated that it recently had "all the belts hoses and gaskets replaced along with the recent oil change" I asked if she had ever had the timing belt changed or any major repairs such as clutch, wheel bearings, etc and she stated no, other than the front wheel bearings about 2K miles ago. I guess I am looking for what is "common" for these engines with this kind of mileage. Hoping I do not have to do a complete engine so I am asking for some advice before I pull the thing out. Planning on starting with valve cover removal and look for something obvious like a sticky lifter. I have done some research that indicates the timing belt should have been done around 100K. One last question, what kind of mileage (longevity) is common for these engines if properly maintained? Any help is appreciated.