VEHICLE EMISSION CONTROL INFORMATION
(VECI) LABEL
DESCRIPTION
All vehicles are equipped with a combined VECI
label. This label is located in the engine compart-
ment (Fig. 14).
OPERATION
The VECI label contains the following:
• Engine family and displacement
• Evaporative family
• Emission control system schematic
• Certification application
• Engine timing specifications (if adjustable)
• Idle speeds (if adjustable)
• Spark plug and gap
The label also contains an engine vacuum sche-
matic. There are unique labels for vehicles built for
sale in the state of California and the country of
Canada. Canadian labels are written in both the
English and French languages. These labels are per-
manently attached and cannot be removed without
defacing information and destroying label.
DIAGNOSIS AND TESTING
PCV VALVE TEST—3.9/5.2/5.9L ENGINE
(1) With engine idling, remove the PCV valve from
cylinder head (valve) cover. If the valve is not
plugged, a hissing noise will be heard as air passes
through the valve. Also, a strong vacuum should be
felt at the valve inlet (Fig. 15).
(2) Return the PCV valve into the valve cover.
Remove the fitting and air hose at the opposite valve
cover. Loosely hold a piece of stiff paper, such as a
parts tag, over the opening (rubber grommet) at the
valve cover (Fig. 16).
(3) The paper should be drawn against the opening
in the valve cover with noticeable force. This will be
after allowing approximately one minute for crank-
case pressure to reduce.
(4) Turn engine off and remove PCV valve from
valve cover. The valve should rattle when shaken
(Fig. 17).
Fig. 12 High Intake Manifold Vacuum—Minimal
Vapor Flow
Fig. 13 Moderate Intake Manifold Vacuum—
Maximum Vapor Flow
Fig. 14 VECI Label Location
1 – VEHICLE EMISSION CONTROL INFORMATION (VECI)
LABEL
Fig. 15 Vacuum Check at PCV Valve—Typical
1 – PCV VALVE GROMMET
2 – PCV HOSE
3 – PCV VALVE
4 – VACUUM MUST BE FELT AGAINST FINGER
5 – ENGINE VALVE COVER
DN EMISSION CONTROL SYSTEMS 25 - 29
DESCRIPTION AND OPERATION (Continued)
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