Pontiac FIREBIRD 1972 Service Manual page 513

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ENGINE-MECHANICAL
L-6
A N D V-8 ENGINES
CONTENTS OF THIS SECTION
..................................................
General Description
6-7
F Series Engines
.................................................
6-7
B Series Engines
..................................................
6-7
X
Series Engines
....................................................
6-7
....................................................
G Series Engines
6-7
Six Cylinder Engine
..................................................
6-9
A Series Engines
....................................................
6-7
V-8 Engine
..............................................................
6-47
TROUBLE DIAGNOSIS
ENGINE FAILS TO START
CAUSE
a. Corroded or loose battery terminal connections and/or
g. Carburetor flooded and/or fuel level in carburetor bowl
weak battery.
not correct.
b. Broken or loose ignition wires and/or faulty ignition
h. Dirt and water in gas line or carburetor.
switch.
i. Sticking choke.
c. Excessive moisture on plugs, caps or ignition system.
j. Faulty fuel pump.
d. Damaged distributor rotor, cracked distributor cap
and/or corroded d~stributor contact points.
k. Faulty solenoid or starting motor.
e. Fouled spark plugs and/or improper spark plug gap.
1. Park or neutral switch inoperative.
f. Weak or faulty coil.
ENGINE LOPES WHILE IDLING
CAUSE
a. Air leaks between intake manifold and heads.
e. Overheated engine.
b. Blown head gasket.
f. Plugged crankcase vent valve.
c. Worn timing chain or sprockets.
g. Faulty fuel pump.
d. Worn camshaft lobes.
ENGINE MISSES WHILE IDLING
CAUSE
a. Spark plugs damp or gap incorrectly set.
c. Leaks in ignition wiring.
b. Excessive moisture on ignition wires and caps.
d. Ignition wires making poor contact.

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