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6 E-4
1977 PONTIAC SERVICE MANUAL
F U L L VACUUM
SOURCE
A I R CLEANER
VACUUM MOTOR
I
(VALVE SHOWN OPEN)
Fig.
6E-4
Thermostatic Air Cleaner
Diagnosis and service procedures for air injection
reaction systems are in this section.
VACUUM CONTROLS
Various types of vacuum controls are used in the
emission control system to modify or control the operation
of the various emission control components to optimize
emission control effectiveness, while minimizing any negative
effect on driveability. The types of vacuum control valves
used are:
Thermal Vacuum Switches
-
W S
Vacuum Delay Valves
-
VDV
Check Valves
-
CV
Vacuum Modulator Valves
-
VMV
Vacuum Reducer Valve
-
VRV
Fig.
6E-5
Pulse Air Injection Reaction Systems
VACUUM HOSE SCHEMATICS
Refer to the vacuum hose schematics shown in Figures
Diagnosis and service procedures for vacuum control
6E-6 through 6E-24 for location and connection of the
valves are with the component being controlled. For example,
various vacuum control valves.
vacuum advance control valves are in Section 6D with the
distributor.
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