nsxd11151a.pdf

Positive Crankcase Ventilation (PCV) System
Description
The Positive Crankcase Ventilation (PCV) system is
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.
PCV HOSE
BREATHER PIPE
FRONT OF
VEHICLE
BLOW-BY VAPOR
FRESH AIR
PCV VALVE
If there is no clicking sound, check the PCV
valve grommet for cracks or damage. If the
grommet is OK, replace the PCV valve and
recheck.
Gently pinch here
2. 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 pliers.
BREATHER
PIPE
PCV VALVE PCV HOSE
Inspection
1. Check the PCV hoses and connections for leaks
and clogging.