If you have a detonation problem, you will not hear it at idle. Pinging or detonation comes on when the engine is under a load. So...if you hear it when the car is just sitting there running, it is NOT detonation.
Get someone to plug the tailpipes with rags while you have your head under the hood. If the sound is louder, you have found an exaust leak.
Get it up on a rack and hunt around under it while it is running. Or put it up on jackstands(NOT JUST JACKS!!!!!)(make sure you chock front and back of a tire on the ground) and crawl around under it. If you hear the noise it is not pinging.
Lots of other ways but I would bet these suggestions get results.....Later
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