On some tractors the sound of a leaking valve, and associated misfire can be detected only at certain speeds. A leakdown check would detect the issue, but requires removal of the injectors. A compression check is the same. I would adjust the valves (looking for a tight clearance on one valve.) I would also crack the injector lines one at a time to find the misfire (assumes it does it in neutral sitting in the yard) Exhaust manifold temperature analysis (with a infrared hand held) might also be decisive in locating which cylinder is missing. Good luck, Jim
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Today's Featured Article - Product Review: Electronic Ignition - by Staff. Oil, for example has come a long way in the last 50 years and I don't use anything but the latest API grade available. I've heard the arguments for non-detergent oils but would never trade it for today's formulations. Paint is another, the modern acrylic enamels are great for resistance to grease and fuel stains, retaining their shine and they last forever; unlike enamels and lacquers . Still another is the alternator. No doubt using the original generator keeps the tractor pure, but for thos
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