Quote:
Originally Posted by A B Able Truck
Vacuum is what closes the diaphragms - once closed then it will pull more air from the filter. Because the valvetronics control engine speed (intake air to cylinder) - throttle body fully open - there is a fine line to accomplish vacuum within the intake and (un)restricted air thru the filter(s).
But all this is reliant on a closed crankcase system (no seal leaks).
And you'll always have blowby that may effect diaphragm operation.
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The crankace only has so much vacuum, once it creats a vacuum in the crankcase thats it, air isnt being created inside the engine so it just holds a vacuum in the crank and now the mass airflow sensor can work effectivly on the intaked air from the filter, thats what causes your engine to trip out with thr dipstick pulled
No seal leaks is the key