Pontiac FIREBIRD 1972 Service Manual page 515

ENGINE-MECHANICAL
6- 3
ENGINE HAS NO POWER
CAUSE
a. Weak coil or condenser.
b. Incorrect ignition timing.
c. Excessive play in distributor shaft or distributor cam
worn.
d. Insufficient point dwell.
e. Spark plugs dirty or gaps incorrectly set.
f. Carburetor not functioning properly.
g. Improper carburetor float level.
h. Carburetor fuel mixture too rich or too lean.
i. Foreign matter, such as dirt or water, in gas line or
carburetor.
j. Faulty fuel pump.
k. Valve spring weak and/or valves sticking when hot.
1. Valve timing incorrect.
m. Incorrect valve lifter clearance.
n. Worn camshaft lobes.
o. Pistons incorrectly fitted in block.
p. Blown cylinder head gasket.
q. Low compression.
r. Flow control valve inoperative (Power Steering).
s. Clutch slipping.
t. Brakes dragging.
u. Engine overheating.
v. Transmission regulator valve sticking (Hydra-Matic).
w. Sub-standard fuel.
EXTERNAL ENGINE OIL LEAKAGE
CAUSE
a. Improperly seated or broken fuel pump gasket.
h. Worn or improperly seated rear main bearing oil seal.
b. Improperly seated or broken push rod cover gasket. i. Loose oil line plugs.
c. Improperly seated or broken oil filter gasket.
d. Broken or improperly seated oil pan gasket.
j. Engine oil pan drain plug improperly seated.
k. Rear camshaft bearing drain hole plugged.
e. Gasket surface of oil pan bent or distorted.
1. Loose rocker arm cover, gasket broken, or cover dis-
torted or bent.
f. Improperly seated or broken timing chain cover gasket.
g. Worn timing chain cover oil seal.
EXCESSIVE OIL CONSUMPTION DUE TO
014
ENTERING
COMBUSTION CHAMBER THROUGH HEAD AREA
CAUSE
a. Intake valve seals damaged o'r missing.
b. Worn valve stems or guides.
c. Plugged drain back holes in head.
d. Intake manifold gasket leak in conjunction with rocker
cover gasket leak.