If there is that much detonation occuring. There is engine damage happening. Run it on premium until you get it diagnosed and repaired.If it hasn"t happened already. There is going to be broken piston rings or broken piston ring lands. I agree it sounds like a plugged EGR but the OBDII should have thrown a check engine code with a no flow EGR. As previously stated the knock sensor has also either failed or the wire/connector is disconnected. Even with a plugged EGR. The ECM should be receiving a knock signal and retarding the timing until the engine is a gutless no knock pig. If the wrong plugs have been installed. The engine can almost get knocking along like a glowplug model airplane engine.
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Today's Featured Article - Third Brush Generators - by Chris Pratt. While I love straightening sheet metal, cleaning, and painting old tractors, I use every excuse to avoid working on the on the electrics. I find the whole process sheer mystery. I have picked up and attempted to read every auto and farm electrics book with no improvement in the situation. They all seem to start with a chapter entitled "Theory of Electricity". After a few paragraphs I usually close the book and go back to banging out dents. A good friend and I were recently discussing our tractor electrical systems when he stated "I figure it all comes back to applying Ohms Law". At this point
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