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There's a sweet spot at tdc for each piston.
You need a leak down test gauge set to do the job and record results.
Remember 5 cylinder engines do not fire every 180 of crank so you need to do the test at bdc..which is safer.
Trying to get the piston to stay at tdc can be fustrating and dangerous.
Do not use a wrench or breaker bar on the crank bolt when applying air pressure...use a flywheel lock.
Good engine = 2% to 15%.
Fair engine = 15% to 25%.
Poor engine = Anything over 25%.
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