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Indeed, I suspect I saw the same Youtube video. I did use a helper. I found that the best way to get the "burp" was to find TDC, rotate backwards 1/4 turn, then turn on the air. At that position the intake valve is open, so no pressure builds at that point. Then I moved the prop toward TDC...

I'm waiting on ACS to send me new intake gaskets, but I'm highly confident that stopping the leaking intake will have my engine purring at idle once again! The source of the leak wasn't a bad gasket, it was a loosened bolt holding the intake pipe on the cylinder. The existing gasket was...

Thanks very much for your helpful responses. I found a significant intake leak at the #3 cylinder (sprayed soapy water, used the compression tester to pressurize the cylinder, and backed the propellor off from TDC by 1/4 turn to open the intake valve and ‘burp’ the intake pipe)

Have an IO-360, at 1715 hours in my Glasair IIsFT. This weekend, after startup, developed rough running at idle, with a low temp on CHT #3 On run up, the #3 cylinder temp rose to equal the others. Cruise flight was smooth, with equal CHT on all cylinders. Then on power back, and at idle, the...