Ford 1962 Thunderbird Shop Manual page 13

PART 1-1
-ENGINE
1-7
ENGINE TROUBLE DIAGNOSIS
GUIDE
(Continued)
To determine if
the
cause of
the
The fast idle
cam
for binding.
trouble
is
in
the
primary
or
the
Thermostatic
spring
housing
ad
ENGINE CRANKS
secondary circuit, remove
the
coil
justment.
NORMALLY,
BUT WILL
high
tension
lead from
the
top of
the
NOT START
(Continued)
distributor
and
hold it approximately
FUEL SUPPLY AT THE CARBURETOR
3/io inch from
the
cylinder
head. With
Work
the throttle by
hand
several
the
ignition
on,
crank
the
engine and
times.
Each
time the throttle
is
ac
check
for
a spark. tuated,
fuel
should spurt
from
the
If
the
spark
at
the
coil
high
ten accelerating pump discharge
nozzles.
sion
lead is
good, the
cause of
the
If fuel is discharged
by the
ac
trouble
is probably in
the
distributor
celerating
pump, the
engine
is
prob
cap
or rotor.
ably
flooded,
or
there
is
water
in
If
there
is
no spark or a weak
the
fuel
system,
or an engine me
spark at
the
coil
high
tension
lead,
chanical
item is
at
fault.
the
cause of the trouble
is
probably
If fuel is
not
discharged
by the
in
the
primary circuit, coil
to
dis
accelerating pump,
disconnect
the
tributor
high
tension lead,
or
the
carburetor
fuel inlet line
at
the
coil.
carburetor.
Use
a suitable container
to
catch
the
fuel. Crank
the
en
IF THERE
IS A GOOD SPARK
gine
to
see
if fuel is
reaching
the
AT THE SPARK PLUGS
carburetor.
If fuel is
not
reaching the
carbu
Check
the
spark plugs.
If
the
spark retor,
check:
plugs are not at
fault,
check
the
fol
The fuel
filter.
lowing items:
The fuel
pump.
The
carburetor
fuel inlet line for
AUTOMATIC CHOKE
obstructions.
Check
the
position of
the
choke The fuel pump flexible inlet line
plate.
If
the
engine
is
hot, the
plate
for
a collapsed condition.
should
be
open.
If
the
plate
is
not The fuel
tank
line for
obstruc
open, the
engine will
load up due
to
tions.
the
excessively
rich mixture and
will The fuel
tank
vent.
not start.
If
the
engine
is
cold,
the
If fuel is reaching
the carburetor,
plate should
be
closed.
If
the
plate
is
check:
not
operating properly,
check
the
fol
The fuel inlet
system
including
lowing
items:
the
fuel inlet
needle and seat as
The
choke
linkage for binding.
sembly,
and
the
float
assembly.
FUEL SYSTEM
Carburetor
icing.
ENGINE
STARTS,
BUT
Idle fuel
mixture needles not
prop
Fuel pump defective.
FAILS TO KEEP RUNNING
erly adjusted.
Dirt in
the
carburetor,
not
allowing
Engine idle
speed set
too
low. fuel
to
enter or
be discharged from
The
choke not
operating
properly.
the
idle
system.
Float setting incorrect.
Fuel
inlet
system not
operating
IGNITION
SYSTEM
properly.
Dirt
or water
in fuel lines
or
in
the
Leakage in
the
high
tension
fuel filter.
wiring.
Determine if
the
miss
is steady
or
cylinders
have been
checked.
Ground
erratic and at what speed
the
miss
the
spark plug wire removed.
ENGINE RUNS, BUT
occurs
by
operating
the
engine at
If
the
engine speed changes when
MISSES
various speeds under
load.
a particular cylinder
is
shorted
out,
that
cylinder was
delivering
power
MISSES STEADILY AT
before
being
shorted out.
If
no change
ALL SPEEDS
in
the
engine operation
is
evident,
the
miss
was caused
by
that
cylinder not
Isolate
the
miss
by
operating
the delivering
power
before
being
shorted
engine with one cylinder not
firing.
out.
In
this case,
check
the:
This is done
by
operating
the
engine
with
the
ignition
wire removed
from
IGNITION SYSTEM
one
spark
plug
at a time, until all
If
the
miss
is isolated in
a particu-
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