I just noticed an inaccuracy in my post. It doesn't really get louder as I apply more load, it just goes away when it is coasting and then comes back again when I accelerate. I don't know if that matters or not? It is always the same volume when it is occurring. There are no trouble codes in the engine computer except for the usual end of list code indicating the ECU or EPROM is working (I checked it with the shadetree mechanic method of shorting the scan post to ground in the OBD test socket. However, this means I can't view real-time data. There is also no "check engine" light on, and I know it works, because it came on when the fuel pump relay failed.
I always thought valvetrain noise got louder when the engine is placed under a load. Whenever I listen to an old gas tractor climbing a hill or pulling a heavier load, to me it always seems like the valvetrain gets louder or more pronounced and you hear more of a tapping noise instead of the humming of the motor. When they hit the clutch, it seems as though the tapping quiets down and then the humming is what you hear. Where do I have it wrong or what causes that perception?
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