Honda Civic Service Manual page 536

Emission Control System
Positive Crankcase Ventilation IPCVI System
Descripiion
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 from 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.
D15Y5, D16Y8, 816A2 ongins:
BREATHER
HOSE
Dl6'|11 6ngin6:
-: aLOW-BY VAPOR
-: FnESH AIF
11-266
tJ
lrcpection
1. Check the PCV hoses and connections for leaks and
clogging.
2. At idle, make sure there is a clicking sound from the
PCV valve when the hose between the PCV valve
and the intake manifold is lightly pinched with your
fingers or pliers,
D16Y5, D16Y8 ongins:
BREATHER
HOSE
PCV VALVE
Gently pinch here.
Bl6A2 engins: VALVE
lf there is no clicking sound, check the PCV valve
grommet for cracks and damage. If the grommet is
OK, replace the PCV valve and recheck.
PCV