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Re: pcv system theory and operation gm 1.4 and 1.8
Posted to Technical Theory Forum on 7/2/2021 1 Reply

Although I am not familiar with the GM engines you cite, not all PCV systems induct fresh air to purge the crankcase. Some European marques use a system that maintains a slight vacuum on the crankcase during non-boost conditions. The only air inflow is via sea... Login to read more.

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