Yes, as weird as it may seem the air going into the car through the valve is only a little more than that which can flow through a 1/8 in hole.

When idling normally the engine gets some of its air through the throttle and some through valve. This means of testing just confirms how much is going through the valve.

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Steve Brotherton
Continental Imports
Gainesville FL
Bosch Master, ASE Master, L1
33 years MB technician