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Old 05-03-2021, 09:05 AM   #3
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Join Date: Feb 2004
Location: Stop paddling, I hear banjos.

Originally Posted by esmth View Post
i recently did a compression test in my 240 and opening the throttle vs leaving it closed made zero difference in the reading
Thanks. I'm starting to see it now: the cylinder being tested will pull in air from the intake manifold into which air can enter from the other cylinders as their valves open and close.
2013 XC60 T6
2006 330i
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