The differential tester mentioned in another message is also known as a
leakdown tester.
Testing is generally supposed to be done with the engine warm. Some
conditions, like cracked blocks, may only be evident when the engine is
warm.
But, I never compression test a hot engine. I just don't like being
burned, and I generally learn what I need to know (usually, that the
problem is elsewhere) from the cold test.
Lee
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