Pcv Valve - Dodge Intrepid Service Manual

LH
PCV HOSE (Continued)
Fig. 9 PCV - 3.2/3.5L
(4) Fill coolant system, refer to the Cooling system
for more information.

PCV VALVE

DESCRIPTION
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 (Fig. 10) or (Fig. 11).
Fig. 10 PCV Valve -2.7L
1 - PCV VALVE
2 - THROTTLE BODY
3 - EGR TUBE
EVAPORATIVE EMISSIONS 25 - 17
Fig. 11 PCV Valve—3.2/3.5L
1 - THROTTLE BODY
2 - PCV VALVE
OPERATION
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. 12).
Fig. 12 Engine Off or Engine Backfire No Vapor
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. 13). In
this position there is minimal vapor flow through the
valve.
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. 14).
Flow