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International Automotive Technicians Network
Re: Intake and valve cover
Posted to Technical Discussion Forum on 3/4/2021 6 Replies

My understanding is that the non-return valve in the intake manifold is there to prevent boost pressure from reaching the PCV regulator diaphragm (and damaging it). Under vacuum conditions the valve is open, air enters from the "breather hose" at the turbo, g... Login to read more.

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