Posted by Showcrop on October 27, 2010 at 04:31:55 from (75.67.231.80):
Ford 172 with less than 100 hours on all new motor started skipping under load. Checked compression, 152,152,144,150. Checked spark, got the spark that "Old" always describes. Fat, blue, jumps 16 inches. All plugs spark. Pulled the plug wires off one at a time and identified the missing cylinder. All but one plug has a lot of soot on it. What is my problem?
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Today's Featured Article - Engine Valves - Some Helpful Information - by Staff. Intake - On the intake stroke the piston moves doward, sucking in carburized fuel through the open intake valve. Exhaust valve is closed. Compression - With both the intake and exhaust valves closed, the pistons upward stroke compresses or squeezes the fuel into the combustion chamber. Firing - Ignited by the spark, the compressed fuel explodes and forces the piston downward on its power stroke. Intake and exhaust valves are closed. Exhaust valves and seats are exp
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