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60-34
1977 PONTIAC SERVICE MANUAL
,
To install, reverse removal procedure.
Integral Ignition Coil (Refer to Fig. 60-32)
REMOVAL
1. Remove wiring connector from distributor cap by
lifting two retaining tabs.
2. Remove three coil cover attaching screws, and lift off
cover.
3. Remove four coil attaching screws and lift ignition coil
and leads from cap.
4. Remove coil arc seal.
INSTALLATION
To install, reverse removal procedure.
Capacitor (Refer to Fig. 60-42)
REMOVAL
1. Remove distributor cap and rotor.
2. Remove capacitor attaching screw, and unplug
capacitor.
INSTALLATION
1. Plug in capacitor.
2. Install hold down screw making sure ground lead is
under screw.
DISTRIBUTOR SPARK SWITCHES
(REFER TO FIG. 6D-37)
Distributor spark vacuum hoses are to be checked for
proper connection, cracking, abrasion or deterioration at
regularly scheduled maintenance intervals. Refer to owner
maintenance schedule in Section 0 for applicable intervals.
Refer to Section 6E for vacuum hose schematics. The
following procedures are to be followed when checking
operation of vacuum advance system at regular maintenance
intervals.
All L4-140 Engines
1. Allow engine to cool off to a temperature below 80°F.
This may require not starting the engine for a period of 12
hours. If this is not possible, refer to off-car functional checks
of individual components in this section.
2. Disconnect vacuum hose at distributor and connect
a hand vacuum pump to the distributor spark vacuum unit
and apply 15 inches of mercury vacuum. Observe vacuum
reading for 20 seconds. If vacuum drops more than one inch,
replace vacuum unit.
3. "TEE" a vacuum gage into the vacuum hose at the
distributor spark vacuum unit.
4. Start engine and observe vacuum reading. Vacuum
should be within one inch of manifold vacuum. If not, trace
back along the vacuum hose from the vacuum unit to the
vacuum source until the vacuum leak or plugged condition
is located. Correct as necessary.
5. Start engine and allow vacuum reading to stabilize.
Turn off the ignition and observe the vacuum gage.
Vacuum reading should not drop immediately,
but should drop slowly (taking about 20 to 30
seconds to go from 15 to 5 inches).
6. If the vacuum drops too fast, the VDV is defective or
there is a leak in the distributor vacuum advance unit. If the
vacuum drops too slowly, the VDV is defective.
7. Allow engine to warm up until coolant temperature
is above 1 15°F. Turn ignition off and observe vacuum reading.
Vacuum should drop immediately. If vacuum does not drop
immediately, either the vacuum hoses between the DS-TVS
and VDV are plugged or the DS-TVS is defective; repair as
required.
8. Disconnect vacuum hose at distributor and note
decrease in idle RPM or retarding of igntion timing. If idle
RPM and timing do not change, correct binding condition
in vacuum unit by repair or replacement.
9. Re-connect vacuum hoses per vacuum hose
schematics.
L4-151 Engine
1. Allow engine to cool off to a temperature below 80°F.
This may require not starting the engine for a period of 12
hours. If this is not possible, refer to off-car functional checks
of individual components in this section.
2. Disconnect vacuum hose at distributor and connect
a hand vacuum pump to the distributor spark vacuum unit
and apply 15 inches of mercury vacuum. Observe vacuum
reading for 20 seconds. If vacuum drops more than one inch,
replace vacuum unit.
3. "TEE" a vacuum gage into the vacuum hose at the
distributor spark vacuum unit.
4. Start engine and observe vacuum reading. Vacuum
should be within one inch of manifold vacuum. If not, trace
back along the vacuum hose from the vacuum unit to the
vacuum source until the vacuum leak or plugged condition
is located. Correct as necessary.
5. Start engine and allow vacuum reading to stabilize.
Turn off the ignition and observe the vacuum gage.
Vacuum reading should not drop immediately,
but should drop slowly (taking about 7 seconds on
automatic transmission vehicles or 3 seconds on
manual transmission vehicles.
6. If the vacuum drops too fast, the VDV is defective or
there is a leak in the distributor vacuum advance unit. If the
vacuum drops too slowly, the VDV is defective.
7. Allow engine to warm up until coolant temperature
is above 1 15°F. Turn igntion off and observe vacuum reading.
Vacuum should drop immediately. If vacuum does not drop
immediately, either the vacuum hoses between the DS-TVS
and VDV are plugged or the DS-TVS is defective; repair as
required.
8. Disconnect vacuum hose at distributor and note
decrease in idle RPM or retarding of ignition timing. If idle
RPM and timing do not change, correct binding condition
in vacuum unit by repair or replacement.
9. Re-connect vacuum hoses per vacuum hose
schematics.
V6-231 Engine Except California
1. Disconnect vacuum hose at distributor and connect
a hand vacuum pump to the distributor spark vacuum unit
and apply 15 inches of mercury vacuum. Observe vacuum
reading for 20 seconds. If vacuum drops more than one inch,
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