compression test

should you remove all the spark plugs do get an accurate result from a compression test, or is 1 at time ok?

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If you're doing a cranking compresion test, all of the sparkplugs would be removed, throttle wide open and fuel and spark delivery disabled. If you're doing a running compression test, only the sparkplug for the cylinder being tested would be removed. If you're doing it electronically, no sparkplugs need to be removed.
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It's best to test hot, one at a time. If plug access is tough, than test all cylinders cold, and realize readings could be bogus.
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