Check Fuel Lines And Service Fuel Filter; Inspect And Service Cooling System; Test Dwell And Dwell Variation; Test Ignition Timing And Advance - Pontiac Grand Prix Service Manual

6C -4
1959
PONTIAC SERVICE M ~ J A L
Fig.
6C-1
Schematic o f Tune-up Instrumentation
CHECK FUEL LINES AND SERVICE FUEL FILTER
1. Inspect fuel lines for kinks, bends or leaks and
correct any defects found. If necessary to replace fuel
line, use only steel double flared end lines.
2.
Replace filter in carburetor inlet.
NOTE:
If
a complaint of poor high speed perfor-
mance exists on the vehicle, fuel pump tests should
be performed.
INSPECT AND SERVICE COOLING SYSTEM
Inspect cooling system for leaks, weak hoses, loose
hose clamps and correct coolant level, and service as
required.
NOTE: A cooling system pressure test may be
performed to detect internal or external leaks
within the cooling system.
CHECK LUBRICANT LEVEL AND INSPECT FOR OIL
LEAKS
Check level of lubricant in crankcase and inspect
engine for oil leaks.
CHECK CARBURETOR CHOKE AND UNLOADER
OPERATION AND ADJUSTMENT
The specified choke setting provides ideal choke
operation in all climates. No seasonal changes are
necessary. For setting, see ENGINE FUEL, section 6B.
Choke linkage and fast idle cam must operate freely. Do
not lubricate linkage since this will collect dust and
cause sticking.
Check unloader adjustment, see section 6B.
IDLE STOP SOLENOID
-
6-CYL. AND RAM AIR
ENGINES
Adjust idle stop solenoid to obtain correct idle speed
(solenoid active speed). Observe operation of idle stop
solenoid by disconnecting lead, with engine running at
specified hot idle speed, the plunger should drop back
allowing the idle screw to contact the carburetor idle
cam. In this position the engine speed should drop to
the specified lower solenoid inactive idle speed. (See
Section 6D for proper idle setting and procedures.)
CONNECT TUNE-UP EQUIPMENT
Follow manufacturer's recommendations for the use of
testing equipment. Fig. 6C-I shows a basic schematic
for instrumentation which will apply to many types of
test equipment and may be used as a rough guide if
equipment manufacturer's instructions are not availa-
ble.
Connections shown in Fig. 6C-1 are made as follows:
1. Timing light
2. Tachometer
3. Dwell Meter
TEST DWELL AND DWELL VARIATION
Two methods are offered for dwell or point gap
adjustment on the vehicle.
when eve^
possible, a dwell
meter should be used for better accuracy.
1. With engine running at idle, raise the adjusting
screw window and insert an Allen wrench in the socket
of the adjusting screw.
2. With dwell meter connected, adjust dwell angle to
30 degrees for all V-8 engines. A 2-degree variation is
allowable for wear. If a dwell meter is not available,
turn adjusting screw clockwise until engine starts to
misfire, .then turn screw one-half turn in the opposite
direction to complete adjustment.
3. Close access cover fully to prevent the entry of dirt
into the distributor.
6 CYL
On 6 cyl., adjust point gap with a flat feeler gauge to
. O 19" (new) or . O 16" (used).
TEST IGNITION TIMING AND ADVANCE
1. Attach a timing light and tachometer as shown in
Fig. 6C- 1.
NOTE: Disconnect hose from distributor vacuum
control unit.
2.
Set parking brake, start engine and run at idle speed
(solenoid inactive where fitted).
3. Aim timing light at marks on lower timing chain
cover and harmonic balancer.
4. Adjust timing as required by loosening clamp bolt
and rotating distributor until correct timing is indi-
cated, then tighten clamp bolt.