Intake manifold side (No vacuum)
 Rocker
cover side
|
Intake manifold side (High vacuum)
 Rocker
cover side
|
Engine
condition
|
Not
running
|
Engine
condition
|
Idling or
decelerating
|
PCV
valve
|
Not
running
|
PCV
valve
|
Fully
operating
|
Vacuum
passage
|
Restricted
|
Vacuum
passage
|
Small
|
Intake manifold side (Moderate vacuum)
 Rocker
cover side
|
Intake manifold side (Low vacuum)
 Rocker
cover side
|
Engine
condition
|
Normal
operation
|
Engine
condition
|
Accelerating
and high load
|
PCV
valve
|
Properly
operating
|
PCV
valve
|
Slightly
operating
|
Vacuum
passage
|
Large
|
Vacuum
passage
|
Much
large
|