Ford THUNDERBIRD 1960 - Page 8

PART
1 -1 - GENERAL ENGINE SERVICE
ENGINE TROUBLE DIAGNOSIS GUIDE Continued
1 -3
With the ignition
on and the engine
turning over,
check for a spark.
If the spark at the coil high
ten
sion lead is good, the cause
of the
trouble is probably in
the
distributor
cap,
rotor, or the spark plug wires.
If there is no spark or a weak
spark at the coil high tension
lead,
the cause of the trouble is probably
in the primary circuit, coil
to
dis
tributor high tension lead,
or
the
coil.
FUEL SUPPLY AT CARBURETOR
Work the throttle by hand several
times. Each time
the throttle is ac
tuated, fuel should
spurt from the
accelerating pump discharge nozzles.
If fuel is discharged by the ac
celeratingpump,
the engine is prob
ably flooded,
or there is water in
the fuel system, or an engine me
chanical item,
such as valves, is at
fault.
A GOOD SPARK AT
THE SPARK PLUGS
If the spark is
good at the spark
plugs, check
the spark plugs and the
ignition timing.
If the spark plugs
or the ignition timing
are not at
fault, check the following items:
AUTOMATIC
CHOKE
Check the position of
the
choke
plate. If the
engine is hot, the plate
should
be open. If the plate is not
open, the
engine will load up due to
the excessively rich mixture
and
will
not
start.
If the engine is cold, the
plate should be closed, if the plate is
not operating properly, check the fol
lowing items:
The choke linkage for binding.
The fast idle cam for binding.
Thermostatic spring housing ad
justment.
Fast idle speed screw for proper
adjustment.
If fuel is not discharged by the
accelerating pump, disconnect the
carburetor fuel inlet line at the
carburetor. Use a suitable container
to catch the fuel. Crank the en
gine to see if fuel is reaching 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 reachingthe carburetor,
check:
The fuel inlet system including
the
fuel inlet needle and seat assem
bly, and the float assembly.
Check for dirt in the carburetor,
not allowing fuel to enter or be dis
charged from
the idle system.
ENGINE CRANKS
NORMALLY, BUT WILL
NOT START Continued
ENGINE STARTS, BUT
FAILS TO KEEP RUNNING
FUEL SYSTEM
Carburetor icing.
Idle fuel
mixture needles not prop-
Fuel pump defective.
erly adjusted.
Engine idle
speed set too low.
IGNITION SYSTEM
The choke not operating properly.
Float
setting incorrect.
Breaker points
not properly ad-
Fuel inlet system not operating
justed.
properly.
Defective spark plugs.
Dirt
or water in fuel lines, fuel Leakage in the high tension
filter, or carburetor, wiring.
ENGINE RUNS, BUT
MISSES
Determine if the miss is steady or
MISSES STEADILY AT
erratic and at what speed the miss ALL
SPEEDS
occurs by operating the engine at
Isolate the miss by operating the
various speeds under load, engine with one cylinder not firing.
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