I was sitting in a quite parking lot last night with the engine running, I had my radio on. I random bass noise coming from the right side that was inconsistant with the music, so I turned off the radio. But then I heard the bass sounding noise again. I thought, maybe someone has their radio up in the far distant with the windows down.. I get out and I don't hear anything, so I turn the engine on again and I hear the noise again. Its not a loud bass noise, but it's not a sharp pinging noise either. Its not frequent either... maybe 1 or 2 knocks every 10 seconds... when I reved up I hear the noise alittle more frequently Remember I was idle, not moving...
I'm trying to rule out if its engine knocking or a tranny bearing... What exactly does an engine knock sound like? Is it a loud ping noise or a more deep bass sounding noise?

 

Sounds more like a heatshield or similar issue. Most engine knocking or ticking is consistant. Get up under your car and check around. You could also check your valves.

 

I heard it again yesterday from the front of the vehicle. It might be exhaust gas escaping..? not sure.

 

do you still have your heat shield on your cat or headers? Check those first. If none of those are loose then you need to look furthur.