Crankcase ventilation system (Honda Civic 3)

1. The crankcase ventilation system includes a positive pressure valve that reduces the emission of hydrocarbons with gases breaking through into the engine crankcase.

Fig. 9.1. Typical crankcase ventilation diagram

2. The main element of the crankcase ventilation system is the positive pressure valve (PPV), crankcase gas filter and connecting hoses.

3. At idle, when there is high vacuum in the intake manifold. The CD creates resistance to the flow of crankcase gases. With a large amount of crankcase gases (for example, due to problems with piston rings) the system passes them through the air filter to facilitate the normal combustion process.

4. Checking and replacing the crankcase pressure regulator and crankcase gas filter are described in Chapter 1.

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This information has been verified: Yaroslav Shiryaev

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Civic 3 and 4: Emission control system

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Air temperature sensor (models with injection) — control and replacement
Air Flow Control Valve (1988 and Later Models) — Inspection and Replacement
Throttle Position Sensor — Checking and Replacing
Crankshaft Position Sensor — Checking and Replacement
Absolute pressure sensor — inspection and replacement

Fuel vapor recovery system
Intake Air Temperature Control System (Carburetor Models)
Ignition Timing Control System
Throttle control system
Atmospheric pressure compensator