Positive Crankcase Ventilation System - Honda Civic 1998 Service Manual

Positive Crankcase Ventilation (PCV) System
D€scription
T h e P o s i t i v e C r a n k c a s e V e n t i l a t i o n ( P C V ) s y s t e m i s
designed to prevent blow-by gas trom escaping to the
atmosphere. The PCV valve contains a spring-loaded
plunger. When the engine starts, the plunger in the PCV
valve is lifted in proportion to intake manifold vacuum
and the blow-by gas is drawn directly into the intake
manifold.
O16Y5, D16Y8 engine:
D16Y7 engine:
:: ELOW-BY VAPOR
e: FRESH AIR
Inspgqtion
1 . Check the PCV hoses and connections for leaks and
clogging.
At idle, make sure there is a clicking sound from the
PCV valve when the hose between PCV valve and
intake manifold in lightly pinched with your fingers
or olters.
D16Y5, D16Y8 ongine:
Gently pinch here.
PCV VALVE
D16Y7 engine:
G e n t l y p i n c h h e r e .
l f t h e r e i s n o c l i c k i n g s o u n d , c h e c k t h e P C V v a l v e
grommet for cracks and damage. lf the grommet is
OK, replace the PCV valve and recheck.
VALVE
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