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 - Harvestin Hay: The Early Years (Part 2) - by Pat Browning. The summer of 1950 was the start of a new era in farming for our family. I was thirteen, and Kathy (my oldest sister) was seven. At this age, I believed tractor farming was the only way, hot stuff -- and given a chance I probably would have used the tractor, Dad's first, a 1936 Model "A" John Deere, to go bring in the cows! And I think Dad was ready for some automation too. And so it was that we acquired a good, used J. I. Case, wire tie hay baler. In addition to a person to drive th
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