Ok, it started about a week ago. Driving at normal speeds and I hear a tap sound. Kind of loud because my kids heard me coming home about 200 yards away. Metal on metal not continuous but very often even at slow speeds (10-15 mph) but also at higher speeds. I've been under the vehicle every day and checked every single thing I could. Any thing that had a bolt,clamp, ziptie, I mean EVERYTHING. Heat shields you name it. Now this morning I am starting to lean towards a bearing in the engine. Oil change the other day did not reveal any shavings at all. It was making the noise before the oil change also. Any thoughts to this?? Oil pressure is fine, no leaks. Thanks