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Re: Will a GDI engine run without vacuum?
Posted to Technical Theory Forum on 6/26/2013

Hello Robert,

It's late, and I haven't read the whole thread, but...

BMW Valvetronic engines run with the butterfly throttle closed just enough to get about 1.5" Hg vacuum in the manifold. (Just enough to clear crankcase and carbon cannister vapors.) Valve... Login to read more.