re: Mechanic question. Acura TL rattle.

I have an 04 Accord with the same engine as your TL. Mine makes the same noise. Its not a heat shield because it "ticks" faster with RPM increase. Noise goes away after only a mile or so of driving. In the summer or warmer days it doesn't do it. I've searched the TL and Honda forums and came up empty handed also. I suspected valves out of adjustment, but the noise comes more from the passenger side of the engine. I've replaced the timing belt, tensioner and the water pump and the noise was still there. Let me know if you find an answer.