Chrysler 1997 Stratus Convertible RHD Service Manual page 1182

PCV VALVE FRONT
25 - 16 EMISSION CONTROL SYSTEMS
DESCRIPTION AND OPERATION (Continued)
Fig. 6 PCV System—2.5L
PCV VALVE
The PCV valve contains a spring loaded plunger.
The plunger meters the amount of crankcase vapors
routed into the combustion chamber based on intake
manifold vacuum.
When the engine is not operating or during an
engine backfire, the spring forces the plunger back
against the seat. This prevents vapors from flowing
through the valve (Fig. 7).
Fig. 7 Engine Off or Engine Backfire—No Vapor
COVER VALVE
Flow
When the engine is at idle or cruising, high mani-
fold vacuum is present. At these times manifold vac-
uum is able to completely compress the spring and
pull the plunger to the top of the valve (Fig. 8). In
this position there is minimal vapor flow through the
valve.
Fig. 8 High Intake Manifold Vacuum—Minimal Vapor
During periods of moderate intake manifold vac-
uum the plunger is only pulled part way back from
the inlet. This results in maximum vapor flow
through the valve (Fig. 9).
Fig. 9 Moderate Intake Manifold Vacuum—Maximum
Vapor Flow
VEHICLE EMISSION CONTROL INFORMATION
LABEL
All models have a Vehicle Emission Control Infor-
mation (VECI) Label. Chrysler permanently attaches
the label in the engine compartment. It cannot be
removed without defacing information and destroying
the label.
The label contains the vehicle's emission specifica-
tions and vacuum hose routings. All hoses must be
connected and routed according to the label.
If any difference exists between the VECI label on
the vehicle and the vacuum schematic in the Service
Manual, refer to the label on the vehicle.
Flow
JX