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compression test, manofold off or on?

1817 Views 11 Replies 4 Participants Last post by  mopar56
dose any one know if performing a compression test results will vary on a la block weather or not the intake manifold is off or on?, the engine is out of the vehicle some what stripped down with the intake off
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2017 Ram 1500 3.6 Crew
3,266 Posts
Always done with throttle open so no vacuum in the intake. All plugs should be out for maximum rotation speed and low load on the starter/battery. If the manifold is off, make extra sure that nothing can drop into the valves. Warm or cold should not matter that much (battery power drops quite a bit when cold). Evenness is the most important factor unless engine is just totally worn out.
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