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POSITIVE CRANKCASE
VENTILATION (PCV)
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BLOW BY GASES
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48
OPERATION: All General Motors gasoline engine
powered
vehicles
are equipped with Positive
Crank-
case Ventilation-a system which permits no crank-
case emissions to be discharged into the atmosphere.
To function properly, the system depends on the
PCV Valve which returns blow-by gases to the com-
bustion chamber where they are burned.
MAINTENANCE: This valve must be clean in
order to maintain efficient engine operation.
An inspection of the ventilation filter should
be made at the first oil change (4 months or
6,000 miles, whichever occurs first). At each
subsequent oil change, the ventilation filter
should be inspected and replaced if neces-
sary. Replace filter at least every 24,000 miles.
Under normal driving conditions, the PCV
Valve should be replaced every 24 months or
24,000 miles, whichever occurs first, and all
hoses and fittings should be inspected and
cleaned or replaced, as necessary. Replace the
PCV Valve and inspect related parts every 12
months or 12,000 miles when the vehicle is
used in a service requiring more frequent en-
gine oil change as covered on page 58.
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