Pontiac FIREBIRD 1972 Service Manual page 514

6-2 1972 PONTIAC SERVICE MANUAL
e. Uneven compression. k. Air feak at carburetor mounting gasket.
f. Burned, pitted or incorrectly set contact points.
1. Choke inoperative.
g. Faulty coil or condenser. m. Faulty spark advance mechanism.
h. Worn distributor cam or cracked distributor cap.
n. Burned, warped, pitted, or sticking valves.
i. Incorrect carburetor idle adjustment and/or dirty jets or
o. Incorrect valve lifter clearance.
plugged passages in carburetor.
p. Low compression.
j. Foreign matter, such as dirt or water, in gas line or
carburetor.
ENGINE MISSES AT VARIOUS SPEEDS
CAUSE
a. Dirt and water in gas line or carburetor. i. Spark plugs dirty or damp and/or gaps set too wide.
b. Fouled carburetor jets.
j. Insufficient point dwell.
c. Incorrect ignition timing.
k. Detonation or pre-ignition.
d. Points dirty, pitted or incorrectly spaced. 1. Excessively worn fuel pump diaphragm.
e. Excessive play in distributor shaft.
f. Insufficient spring tension on points.
g. Distributor cam lobe worn.
h. Weak coil or condenser.
m. Weak valve spring.
n. Worn camshaft lobes.
o. Engine overheating.
p. Sub-standard fuel.
ENGINE STALLS
CAUSE
a. Carburetor idle speed set too low and/or idle mixture
too rich or too lean.
j. Distributor advance inoperative.
k. Exhaust system restricted.
b. Carburetor needle valve and seat inoperative.
1. Leaks in carburetor mounting gasket or intake manifold.
c. Incorrect carburetor float level and/or carburetor
flooding.
d. Dirt or water in gasoline or carburetor.
e. Choke improperly adjusted or sticking.
f. Faulty ignition system.
g. Spark plugs damp or dirty and/or gaps incorrectly set.
h. Faulty coil or condenser
m. Incorrect valve lifter clearance.
n. Burned, warped, or sticking valves.
o. Low compression.
p. Engine overheating.
,
q. Loose, corroded, or leaking wiring connections (bulk-
head connector, etc.).
i. Distributor points burned, pitted, dirty, or incorrectly
set.