Positive Crankcase Ventilation System - Mitsubishi Eclipse Technical Information Manual

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ENGINE <NON-TURBO> - Emission Control Svstem

POSITIVE CRANKCASE VENTILATION SYSTEM

The positive crankcase ventilation system is a sys-
tern for preventing the escape of blow-by gases
from inside the crankcase into the atmosphere.
Fresh air is sent from the air cleaner into the crank-
case through the breather hose to be mixed with
the blow-by gases inside the crankcase.
The blow-by gas inside the crankcase is drawn into
the intake manifold through the positive crankcase
ventilation valve.
Positive crankcase
ventilation valve
The positive crankcase ventilation valve is designed
to lift the plunger according to the intake manifold
vacuum so as to regulate the flow of blow-by gas
properly.
In other words, the blow-by gas flow is regulated
during low load engine operation to maintain engine
stability, while the flow is increased during high load
operation to improve the ventilation performance.
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