.the question is exactly HOW bad? And the answer is "very". I hooked this up to my air supply system. I connected the spark plug adapter to the pressure gauge but did not screw it into the engine. I freed my hands to simulate a 100 percent leak situation. I started turning the dial to let in air. When I reached 20psi on the gauge, the % cylinder leak was 5%. It had to show 100% because all the air was coming out.
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