Trying to find what is making a scraping/rattling sound.

[jayeh]

Hi Guys,

Lately my car has been making a rattling sound, it's especially evident when in a parking garage or going through a drive through where the sound bounces back. It sounds like a light piece of metal, like a heat shield rattling.

Occasionally I hear a sound which sounds like the when the muffler would fall off and drag behind the car. I only hear either sound once in a while. I've put the car up on ramps a few times but can't find anything loose.

Any ideas on where to look further?