I have a 2009 tsx/teh. I heard a loose change sound coming from driver's side area. I am sure is coming from outside, but I just have a hard time to locate it. It happen when you accelerate it from stop. It happen around 2000RPM. The sound is not lound, but it definitely there to bother you. I try to roll down driver's window to listen to it, but i can't hear anything with window down. I suspect will this sound is engine pinging, b/c it happen when I accelerate it, but the sound it seems not coming from engine bay.
Where exactly engine pinging sound come from? top of engine or underneath of engine. when you hear it, it will come from front engine hood area or it could be heard from other areas.

Sorry for long posting.

Thanks.

 

Might want to get acquainted with the "search" function on the site. Both of these issues have been discussed before.