i'm noticeing what sounds almost like a knocking coming from the driver side of the engine. nothing from the passenter side, only from the driver side. I don't think it's the driver side belt coming loose, I've heard that before... it's a much fainter version and it doesn't seem to come from the front, more from the top. Put my hand on the cover and didn't feel anything... just a gentle and steady vibration of the engine. It's harder to hear from the inside of the car, but with the stereo off and the heater off it can be heard. and there's this strange... ticking coming from the back of the throttle body? increases with engine rpms. also faint but can be heard with nothing on inside the car. it's way faster paced than the tod. the engine has to be running to hear the ticking, so i don't think it's electrical. Just did a tune up... spark plugs, wires, disty cap, waiting for rotor button to get here. the performance of the car hasn't changed since the tune-up. dunno if that's an important piece of information or not, but there it is. lol

That's funny, I was just dealing with the same problem. See my new post "Ditch the timing belt covers". for more info.

the click at the throttle body is just the injector normal noise