Service Manuals, User Guides, Schematic Diagrams or docs for : . Car Manuals Subaru Impreza 2001-2002.2004-2007 Approved Subaru Impreza 2004 WRX STi 08. MECHANISM AND FUNCTION 03. EMISSION CONTROL (Aux. Emission Control Devices) 03. Crankcase Emission Control System
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W1860BE.book Page 6 Tuesday, January 28, 2003 11:01 PM
CRANKCASE EMISSION CONTROL SYSTEM
EMISSION CONTROL (AUX. EMISSION CONTROL DEVICES)
3. Crankcase Emission Control System
The positive crankcase ventilation (PCV) system prevents air pollution which will be caused by
blow-by gas being emitted from the crankcase. The system consists of a sealed oil filler cap, rocker
covers with fresh air inlet, connecting hoses, a PCV valve and an air intake duct.
In a part-throttle condition, the blow-by gas in the crankcase flows into the intake manifold through
the connecting hose of crankcase and PCV valve by the strong vacuum created in the intake man-
ifold. Under this condition, fresh air is introduced into the crankcase through the connecting hose of
the rocker cover.
In a wide-open-throttle condition, a part of blow-by gas flows into the air intake duct through the
connecting hose and is drawn into the throttle chamber, because under this is condition, the intake
manifold vacuum is not strong enough to introduce through the PCV valve all blow-by gases that
increase in the amount with engine speed.
EC(H4SO)-6
W1860BE.book Page 7 Tuesday, January 28, 2003 11:01 PM
CRANKCASE EMISSION CONTROL SYSTEM
EMISSION CONTROL (AUX. EMISSION CONTROL DEVICES)
(A) (1)
: (C)
: (D)
: (E)
(3)
(4)
(2) (5)
(10)
(7) (9)
(6) (8) (9)
(B)
(1)
: (C)
: (D)
: (E)
(3)
(4) (5)
(2)
(6)
EC-00018
(1) Air cleaner case (6) Crankcase (A) Part-throttle condition
(2) PCV valve (7) Case (B) Wide-open-throttle condition
(3) Throttle body (8) Valve (C) Outside air
(4) Intake manifold (9) Spring (D) Mixture of air and blow-by gas
(5) Oil filler cap (10) PCV valve (E) Blow-by gas
EC(H4SO)-7
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