Poor description? I don't recall saying anything about rattlin under the car? Only my mom would confuse an engine rattle with a heat shield rattle. But thanks for trying to provide advice. However, it's not the "heat shield" that's rattling. That would come from underneath the car. I had a Del Sol that did that and I personally removed it and then rewelded it when I added an aftermarket exhaust.

I've adjusted the valves 3 times over the last 4 years, and that didn't take care of it. Nissans will also do this sometimes, and their techs think it's the lifters dropping overnight. I think that's a load of shi... However, certified Honda techs think it's a combination of the lifters and the valves. If you approach the problem logically, cold weather causes metal to contract. Hence, leaving more space between the shaft and the actual cylinders/lifters. Once the engine heats up, the engine rattle goes right away. My local shop keeps telling me that it may actually increase the life of the engine because the xtra space is reducing the friction although producing an annoying rattle.