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1977 PONTIAC SERVICE MANUAL
G. Surges
1. With engine running, remove air cleaner
cover and filter. Damper door in air cleaner
snorkel should be closed when engine is cold.
It may be necessary to place cold wet rag
over sensor to close if engine is too warm.
2. Visually check the following:
a. Vacuum hoses for plits, kinks and proper
connections. See hose routing charts,
Section 6E.
b. Air leaks at carburetor mounting and
intake manifold.
c. Ignition wires for cracking, hardness
and proper connections. Repair or replace
as necessary.
3. Check ignition timing per emission
control information label. Vacuum advance
hose should be disconnected and plugged.
NPTE: To check mechanical advance, observe
timing marks. It should advance as throttle
is opened and return to mark as throttle
is closed.
4. With engine off, remove vacuum hose from
distributor vacuum advance. Connect vacuum
pump and apply 15" vacuum. Vacuum should hold
steady for 15 seconds. If vacuum drops,
replace vacuum advance unit.
5. Check carburetor fuel inlet filter.
Replace if dirty or plugged.
6. Test fuel pump by connectning hose from
carburetor fuel feed line to a suitable
container.
Start engine and let idle for 15 seconds.
a. Mechanical pump should supply 1/2 pint
or more. If not, go to step 7. If OK,
go to step 9.
b. If electric pump supplies less than 1/2
pint, check fuel lines to tank for kinks
or dirt. If OK, go to step 9.
NOTE: Check electric supply to pump. If
less than 12.2 volts, check pump wiring
circuit. See Section 6C.
7. To check mechanical fuel pump, disconnect
inlet hose at pump and connect a vacuum gage.
Crank or run engine until maximum vacuum is
reached. If less than 12 inches, replace
pump. If vacuum reading is 12 inches or
more, go to step 8.
8.
Check fule lines and hoses for splits,
leaks or kinks by disconnecting each section
of line and connect vacuum gage. Crank or
run engine until vacuum gage peaks. Vacuum
should be at least 12 inches. If less,
repair or replace defective line or hose.
9. If fuel lines and pump check OK, remove
tank unit, replace strainer and clean fuel
tank, if necessary.
10. Remove spark plugs. Check for cracks,
wear, improper gap, burned electrodes,
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