See Figures 1 and 2
The Civics are equipped with a Positive Crankcase Ventilation (PCV) system. This system prevents blow-by gas from escaping to the atmosphere by recycling the gases to the combustion chamber through the intake manifold and/or the air cleaner.
The maintenance interval for replacing the PCV valve is 60,000 miles (96,500 km) under normal use. Under severe operating conditions, the PCV valve may need to be changed sooner.
- Check the PCV valve hoses. They should not leak or be clogged.
- At idle, make sure the PCV valve clicks when the hose between the PCV valve and intake manifold is lightly pinched with your fingers or pliers.
- If there is no clicking sound, check the PCV valve grommet for damage or cracks. If the grommet is intact, replace the PCV valve and recheck.
REMOVAL & INSTALLATION
- The PCV valve is mounted in the intake manifold and has a hose connected to it from the crankcase breather chamber. The valve is removed by pulling it from the manifold and hose.
- Check for loose, disconnected, clogged or deteriorated tubes and replace as necessary. Make sure the hoses are clean inside, cleaning them with a safe solvent, if necessary.
- If the system has a condensation chamber attached to the bottom of the air cleaner, unscrew and remove the chamber, clean and replace it; when removing the top gasket from the chamber, note the angle of installation. Reinstall it in the same position to provide proper airflow.
- Check the valve by pulling it out of the manifold with the engine idling. Cover the open end of the valve with your finger so airflow is stopped. If the valve clicks, it is OK; if not, replace it.
For PCV valve testing refer to Emission Controls of this information.