Mazda RX-8 2004 - Evaporative Emissions (Evap) Control System Outline; Features; Positive Crankcase Ventilation (Pcv) System Structure; Positive Crankcase Ventilation (Pcv) Valve Operation

EMISSION SYSTEM
01–16–7
01–16
POSITIVE CRANKCASE VENTILATION (PCV) SYSTEM STRUCTURE
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• A ventilation hose to the oil filler pipe is provided to send blowby gas to the extension manifold (upper). The gas
is then introduced into the intake port together with intake air and recombusted.
System Diagram
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POSITIVE CRANKCASE VENTILATION (PCV) VALVE OPERATION
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• Forces blowby gas (unburnt gas) that contains CO, HC, and other noxious gas from the rotor housing into the
intake-air system for combustion in the combustion chamber in order to prevent discharge of blowby gas into
the atmosphere.
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EVAPORATIVE EMISSIONS (EVAP) CONTROL SYSTEM OUTLINE
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Features
• A canister design has been adopted to prevent discharge of evaporative gas into the atmosphere.
• A duty solenoid (purge solenoid valve) has been adopted to provide optimum control according to engine
conditions.
• For evaporative purge control, refer to ENGINE CONTROL SYSTEM, EVAPORATIVE PURGE CONTROL.
(See 01–40–30 EVAPORATIVE PURGE CONTROL OUTLINE, 01–40–30 EVAPORATIVE PURGE CONTROL
BLOCK DIAGRAM, 01–40–31 EVAPORATIVE PURGE CONTROL OPERATION.)
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VENTILATION
HOSE
OIL FILLER CAP
OIL FILLER PIPE
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