Ford FALCON 1960 Shop Manual page 12

1-6 GROUP 1- ENGINES AND EXHAUST SYSTEM
ENGINE TROUBLE DIAGNOSIS GUIDE (Continued)
ENGINE CRANKS
NORMALLY, BUT WILL
NOT START
(Continued)
ENGINE STARTS, BUT FAILS
TO KEEP RUNNING
choke plate closes when the choke
knob on the instrument panel is pulled
out and that the plate completely
opens when the knob is pushed in.
fUEl SUPPLY AT CARBURETOR
Work the throttle by hand several
tim es. Each time the throttle is actu-
ated, fuel should spurt from the accel-
erating. pump discharge nozzle or
po rt.
If fuel is discharged by the accel-
erating pump, the engine is probably
flooded, or there is water in the fuel
system, or an engine mechanical item,
such as valves, is at fault.
If fuel is not discharged by the
accelerating pump, disconnect the
carburetor fuel inlet line at the car-
FUEL SYSTEM
Idle fuel mixture needle not prop-
erly adjusted.
Engine idle speed set too low.
The choke not operating properly.
Float setting incorrect.
Fuel inlet system not operating
properly.
Determine if the miss is steady or
erratic and at what speed the miss
ENGINE RUNS, BUT MISSES occurs by ope rating the engine at
various speeds under load.
MISSES STEADILY AT
ALL SPEEDS
Isolate the miss by operating the
engine with one cylinder not firing.
This is done by operating the engine
with the ignition wire removed (:" Jm
one spark plug at a time, until all
cylinders have been checked. Ground
the spark plug wire removed.
If the engine speed changes when a
particular cylinder is shorted out, that
cylinder was delivering power before
being shorted out. If no change in the
engine operation is evident, the miss
was caused by that cylinder not de-
livering power before being shorted
out. In this case, check the:
IGNITION SYSTEM
If the miss is isolated in a particu-
lar cylinder, perform a spark plug
test on the ignition lead of that cyl-
inder.
bUTelor. Use a suitable container to
catch the fuel. Crank the engine to
see if fuel is reach ing the carburetor.
If fuel is
not reaching the carbu-
retor, check:
The fuel filter.
The fuel pump.
The carburetor fuel inlet line for
obstructions.
The fuel pump flexible inlet line
for a collapsed condition.
The fuel tank line for obstructions.
The fuel tank vent.
If fuel is reaching th e carburetor,
check:
The fuel inlet system induding the
fuel inlet needle and seat assembly,
and the float assembly.
Dirt or water in the fuel lines or
fuel lilter.
Carburetor icing.
Fuel pump defecti ve.
Check for dirt in the carburetor
not allowing fuel to enter or be dis-
charged from the idle system.
IGNITION SYSTEM
Leakage in the high tension wiring.
If a good spark does not occur, the
trouble is in the seco ndary circuit of
the system. Check the spark plug
wire and distributor cap.
If
a good spark occurs, check the
spark plug.
If the
spark plug is not at
fault, a mechanical component of the
engine is probably at fault.
ENGINE
Perform a compression test to de-
termine which mechanical compo-
nent of the engine is at fault.
MISSES ERRATICALLY
AT ALL SPEEDS
EXHAUST SYSTEM
Exhaust system restricted.
IGNITION SYSTEM
Defective breaker points, conden-
ser, secondary wiring, coil, or spark
plugs.
High tension leakage across the
coil, rotor, or distributor cap.
CONTINUED ON NEXT PAGE