I have an Infiniti J30, love the car, never had a single problem in 4 years. All of a sudden I am getting a rattling sound, it appears like it is coming from the right side head. I don't think it could be anything major since the car is not missing at all, and I don't notice a loss of power. I had the car to the dealer, and they seem to think it may be a cam pulley. According to the dealer they have never seen a bad 300zx or J30 engine with less than 100k on it. I have 95k on mine. The dealer told me the only bad engine he saw had 190k on it. Just wondering if anybody here ever had a similar problem with a 300zx or J30. I also don't want to give these clowns $100 an hour when they have no idea what's wrong. Thanks for any help anybody can provide.