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It might be knock sensor not working correctly, or insufficent EGR. It could also be caused by the engine running a little too hot, or even something like a spark plug not correctly torqued, or even cylinders that are getting carbon deposits. At the same time without me actually getting to hear the sound, that is only one possibility based on when you say you are getting the noise. That light throttle application at cruising speed, that creates a light acceleration is called "crowd". It's common for pinging to occur under those conditions.
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