REMOVAL & INSTALLATION
The Positive Crankcase Ventilation (PCV) valve should be replaced every 24 months or 24,000 miles on cars built up to 1974, every 30,000 miles on 1975-77 cars, or every 15,000 miles or 12 months on 1978-79 cars. Symptoms of a defective PCV valve are: rough idle, oil in air cleaner, oil leaks, or excessive oil sludging or dilution.
Inspect the valve at every oil change by pulling the valve from the rubber grommet in the valve cover. Shake the valve, if a rattling sound is heard, the valve is in good condition.