Hyundai Sonata 1991 Shop Manual page 25

MAINTENANCE SERVICE
CRANKCASE EMISSION CONTROL SYSTEM
(PCV valve)
Y'OELOA
The crankcase ventilation system must be kept clean to maintain
good engine performance.
Periodic servicing is required to remove combustion products
from the PCV valve.
Air cleaner
Air intake hose
Throttle body
Surge tank
Ventilation hose
PCVvalve
Blow-by gas _
Fresh air --~
-
_
..
~
Injector
4 - -
Intake manifold
1. DisConnect the ventilation hose from the positive crankcase
ventilation (PCV) valve. Then, remove PCV valve from the
rocker cover and reconnect it to the ventilation hose.
2. Idle the engine and put a finger to the open end of PCV valve
to make sure that intake manifold vacuum is felt on the
finger.
NOTE
At this time, the plunger inside the PCV valve moves back
and forth.
3. If no vacuum is felt replace the PCV valve and ventilation
hose in cleaning solvent or replace if necessary.
10-13