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#11
February 27th 06, 09:03 PM
posted to rec.aviation.owning
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Mystery Vibration - 74 Cherokee 140
Plugs might be clean but the resistor in them can fail or
conduct intermittently, weakening the spark. It won't usually show up during a mag check, but in cruise, if the mags aren't timed exactly the same, the plug that fires first causes a pressure rise in the cylinder that the defective plug now has trouble sparking against. Plugs need to be tested in a pressure-type spark tester, and even then they can act up when hot. Dan 
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