a leak down test consists of compresing the cylinder and listening to the exhaust and intake valves.if you can hear air comming out of either you have a failure.i would get a compresion tester,pull all plug wires remove one spark plug at a time install compression tester(screw in kind)and crank engine until preasure is at max then simply listen to the exhaust valves for air leaks,then listen to intake vaves for air leaks.
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