Hyundai Sonata 1991 Shop Manual page 215

PCV Valve Operating
CRANKCASE EMISSION CONTROL SYSTEM
,.-,
Intake manifold side
•
Intake manifold side
(No vacuum)
(High vacuum)
~
n
~
t
I
f------'
lr \
' - -
Ir
Rocker cover side Rocker cover side
29Y019 29Y020
Engine condition Not running Engine condition Idling or decelerating
PCV valve
Not operating
PCV valve
Fully operating
Vacuum passage
Clogged Vacuum
pass~ge
Small
rtf
Intake manifold side
mr
Intake manifold side
(Moderate vacuuml
(Low vacuum)
~
I
n
\
ff If
\
~
Ir
Rocker cover side
Rocker cover side
29V021
29Y022
Engine condition Normal operation Engine condition
Accelerating and high load
PCV valve
Properly operating
PCV valve
Slightly operating
Vacuum passage
Large Vacuum passage Much larger
29-10