I have to admit, I have never heard a pinging engine in person so i am a bit lacking in knowledge here. After driving the car today the noise definitely sounds more like a rattle. I listened to some youtube clips of pinging engines and it appears like pinging sounds more like someone shaking a spray can. The noise my car is making sounds more like a loose/vibrating heat shield. I crawled under the car again today and thumped around on a bunch of things. I could not find anything that could be rattling. Guess I'm at a bit of a loss here.
When I took the car into the dealership the tech could not hear the noise. I am assuming because the engine was cold by the time he took it for a drive (car sat for about an hour before he got to it). I ended up taking the service manager for a lengthy drive to get the car warm. He heard the noise and diagnosed it as an engine ping although I am not sure I trust his technical backround all that much.
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