Quote:
Originally Posted by san rensho
Oil fill cap comes off easily and the vacuum is very mild, i can hardly feel it when i put my hand over then oil filler tube but I have been getting more smoke at start up lately. Today it was a pretty thick, whitish blue smoke.
So a failing AOS will create a vacuum leak?
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Yes in a way, a working AOS has a low vacuum signal (~5 inches of water) in the engine case, a blown AOS can sometimes be as high as 25 inches of water, which is why it pulls oil into the intake system, which can operate at 25 inches of mercury.
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