See I would consider myself a home mechanic, but I’m definitely no professional. For months I’ve been trying to tack down this noise on my 2006 2.5 SL. When i fire up the motor and it idles up when it’s cold out, it starts making a not crazy loud, but quite noticeable noise from the motor, it sounds like rattling like very loud rattling, I thought it was the heat shield so I taped it up. Turns out it wasn’t. Any ideas?