In addition, the low - level vacuum draws in fresh air to the crankcase from
the crankcase breather.
Not exact matches
Problems with the
crankcase ventilation system,
breather (PCV) valve and intake manifold are common.
Turbocharged engines also experience periods of high intake manifold pressure during which the PCV valve is closed and the
crankcase fumes are admitted to the engine via the
breather and air cleaner.