Chevrolet Light Duty Truck 1973, Service Manual

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E NGINE 6-69
ENGINE STALLS
CAUSE
a. Carburetor idle speed set too low and/or idle
j- Distributor advance inoperative.
mixture too rich or too lean.
k. Exhaust system restricted.
b. Carburetor needle valve and seat inoperative.
1
.
Leaks in carburetor mounting gasket or intake
c. Incorrect carburetor float level and/or carburetor
manifold.
flooding.
m. Incorrect valve lifter clearance.
d. Dirt or water in gasoline or carburetor.
n. Burned, warped, or sticking valves.
e. Choke improperly adjusted or sticking.
0
.
Low compression.
f. Faulty ignition system.
P- Engine overheating.
g- Spark plugs damp or dirty and/or gaps incorrectly
set.
q-
Loose, corroded, or leaking wiring connections
(bulkhead connector, etc.)
h. Faulty coil or condenser.
r. Leak in exhaust gas recirculation valve.
i. Distributor points burned, pitted, dirty, or incor­
rectly set.
ENGINE HAS NO POWER
CAUSE
a. Weak coil or condenser.
l. Valve timing incorrect.
b. Incorrect ignition timing.
m. Incorrect valve lifter clearance.
c. Excessive play in distributor shaft or distributor
n. Worn camshaft lobes.
cam worn.
0
.
Pistons incorrectly fitted in block.
d. Insufficient point dwell.
P- Blown cylinder head gasket.
e. Spark plugs dirty or gaps incorrectly set.
q-
Low compression.
f. Carburetor not functioning properly.
r. Flow control valve inoperative (Power Steering).
g- Improper carburetor float level. s. Clutch slipping.
h. Carburetor fuel mixture too rich or too lean.
t. Brakes dragging.
i. Foreign matter, such as dirt or water, in gas line or
carburetor.
u. Engine overheating.
V .
Transmission regulator valve sticking (Hydra-
J- Faulty fuel pump. Matic).
k. Valve spring weak and/or valves sticking when hot.
w. Sub-standard fuel.
EXTERNAL ENGINE OIL LEAKAGE
CAUSE
a. Improperly seated or broken fuel pump gasket.
b. Improperly seated or broken push rod cover gasket.
c. Improperly seated or broken oil filter gasket.
d. Broken or improperly seated oil pan gasket.
e. Gasket surface of oil pan bent or distorted.
f. Improperly seated or broken timing chain cover
gasket.
Worn timing chain cover oil seal.
Worn or improperly seated rear main bearing oil
seal.
Loose oil line plugs.
Engine oil pan drain plug improperly seated.
Rear camshaft bearing drain hole plugged.
Loose rocker arm cover, gasket broken, or cover
distorted or bent.
g-
h.
j-
k.
LIGHT DUTY TRUCK SERVICE MANUAL