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 - 12-Volt Conversions for 4-Cylinder Ford 2000 & 4000 Tractors - by Tommy Duvall. After two summers of having to park my old 1964 model 4000 gas 4 cyl. on a hill just in case the 6 volt system, for whatever reason, would not crank her, I decided to try the 12 volt conversion. After some research of convert or not, I decided to go ahead, the main reason being that this tractor was a working tractor, not a show tractor (yet). I did keep everything I replaced for the day I do want to restore her to showroom condition.
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