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 David Brown Rose Badge - by Samuel Kennedy. In the 13th century civil war was raging in England. Two English noblemen were involved in a conflict which became known as the War of the Roses. The Duke of York had as his emblem a white rose and the Earl of Lancaster had a red rose. Today the white rose is the official emblem of the county of Yorkshire and the red rose has been adopted by the neighboring county of Lancashire.
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