Honda Prelude 1993 Service Manual page 399

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Positive Crankcase Ventilation (PCVI System

The Positive Crankcase Ventilation (PCV) system is

designed to prevent blow-by gas from escaping to the

atmosphere. The PCV valve contains a springjoaded

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

: BLOW-BY VAPOR

Cf I FRESH AIR

1. Check the PCV hoses and connections for leaks and

At idle, make sure there is a clicking sound from the

PCV valve when the hose between PCV valve and

intake manifold in lightty pincfied wirh your fingers

lf there is no clicking sound. check the pCV valve

grommet for cracks or damage. ll the grommet

is OK, replace the PCV valve and recheck.

Gently pinch here

Troubleshooting