Vehicle Emission Control Information Label; Diagnosis And Testing; Pcv System Inspection - Chrysler 2000 LHS Owner's Manual

25 - 24 EMISSION CONTROL SYSTEMS
DESCRIPTION AND OPERATION (Continued)
Fig. 5 PCV Valve—3.2/3.5L Engine
1 – PCV VALVE
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. 6).
Fig. 6 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. 7). In
this position there is minimal vapor flow through the
valve.
Fig. 7 High Intake Manifold Vacuum—Minimal Vapor
Flow
Flow
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. 8).
Fig. 8 Moderate Intake Manifold Vacuum—Maximum
Vapor Flow
VEHICLE EMISSION CONTROL INFORMATION
LABEL
DESCRIPTION
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.

DIAGNOSIS AND TESTING

PCV SYSTEM INSPECTION

WARNING: APPLY PARKING
BLOCK WHEELS BEFORE PERFORMING ANY TEST
OR ADJUSTMENT WITH THE ENGINE OPERATING.
(1) With engine idling, remove the hose from the
PCV valve. If the valve is not plugged, a hissing
noise will be heard as air passes through the valve. A
strong vacuum should also be felt when a finger is
placed over the valve inlet.
(2) Install hose on PCV valve. Remove the
make-up air hose from the air plenum at the rear of
the engine. Hold a piece of stiff paper (parts tag)
loosely over the end of the make-up air hose.
(3) After allowing approximately one minute for
crankcase pressure to reduce, the paper should draw
up against the hose with noticeable force. If the
engine does not draw the paper against the grommet
after installing a new valve, replace the PCV valve
hose.
(4) Turn the engine off. Remove the PCV valve
from intake manifold. The valve should rattle when
shaken.
2000 LHS, 300M, CONCORDE and INTREPID
Publication No. 81-270-0040
TSB 26-10-99 October, 1999
BRAKE AND/OR
LH