In regard to knock sensors and the ECM I'll add this. A few years ago I changed the timing belt on the wife's '02 PT Cruiser. I unknowingly managed to get the timing belt on 1 tooth off. The engine fired and ran just fine, and didn't show any problems except a slight knock at higher RPM's. When I finally got my FIL's scan tool and hooked it up to see what the problem was (before I knew the belt was off a tooth), it was showing the engine running with more than 20 degrees off. It amazed me that it the sensors would show that many degrees off, but the ECM had no problem compensating for it.
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Today's Featured Article - The Ferguson System Principal An implement cutting through the soil at a certain depth say eight inches requires a certain force or draft to pull it. Obviously that draft will increase if the implement runs deeper than eight inches, and decrease if it runs shallower. Why not use that draft fact to control the depth of work automatically? The draft forces are
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