TROUBLESHOOTING
15
5
Stumbling
when
acceleratmg
from
Idle
Check
accelerator
pump
diaphragm
and
Idle
speed
adjustment
6
Engine
mISses
at
hIgh
speed
or
lacks
power
This
mdlcates
pOSSible
fuel
starvatIon
Check
fuel
pump
pressure
and
capacIty
Clean
main
Jet
and
float
needle
valve
7
Black
exhaust
smoke
Black
exhaust
smoke
means
a
badly
ovemch
nuxture
Check
Idle
mIXture
and
Idle
speed
ad
Justment
Check
for
excessive
fuel
pump
pres
sure
or
blocked
return
hne
from
carburetor
to
fuel
tank
Check
for
leaky
float
or
worn
needle
valve
8
ExceSSIve
fuel
consumptIOn
ThIS
may
be
another
mdIcatIon
of
an
ovemch
fuel
mixture
Check
that
automatIc
choke
oper
ates
If
so
eqUIpped
or
that
the
manual
choke
contraIlS
not
being
left
out
Check
Idle
mIXture
and
Idle
speed
Check
for
excessIve
fuel
pump
pressure
leaky
float
or
worn
needle
valve
Make
certam
that
jets
are
the
proper
SIZe
Fuel
Pump
Pressure
Testing
1
Install
a
T
fittmg
m
the
fuel
hue
close
to
the
carburetor
2
Connect
a
fuel
pressure
gauge
to
the
fittmg
WIth
a
short
tube
3
Check
fuel
pump
pressure
as
described
in
the
Fuel
System
chapter
EXHAUST
EMISSION
CONTROL
The
followmg
symptoms
as
ume
you
have
ad
justed
the
Ignition
and
carburetor
to
specdicatIon
and
that
you
have
checked
the
results
on
an
accurate
exhaust
gas
anajyzer
1
CO
content
too
low
Make
sure
Idle
speed
IS
not
too
low
Check
Idle
mIXture
adjustment
too
lean
Check
carbu
retor
Jets
and
channels
Clean
and
or
replace
as
necessary
Check
engme
condition
With
a
com
pressIOn
and
vacuum
test
2
CO
content
too
hIgh
Check
Idle
mixture
adjustment
too
nch
Check
for
dIrty
air
cleaner
and
defectIve
automatIc
choke
If
so
equipped
Check
carburetor
Jets
and
channels
Clean
and
or
replace
as
necessary
Check
engme
condItIon
WIth
compression
and
vacuum
test
3
Hydrocarbon
level
too
hIgh
Check
that
Idle
speed
and
mIXture
adjustments
are
to
specIfication
Check
spark
plug
condItIon
and
gap
Check
breaker
pomts
Check
IgnItIon
tnumg
too
early
Check
mtake
mamfold
for
leaks
Check
valve
clearance
too
small
Check
condItIon
of
valves
With
compressIOn
test
MANUAL
CLUTCH
1
SlIppage
ThiS
is
most
noticeable
when
acceleratIng
m
a
hIgh
gear
at
relatIvely
slow
speed
To
check
slip
page
park
the
car
on
a
level
surface
WIth
the
handbrake
set
ShIft
to
2nd
gear
and
release
the
clutch
as
If
drlVing
off
If
the
clutch
is
good
the
engme
will
slow
and
stall
If
the
clutch
shps
con
tInued
engme
speed
will
gIve
It
away
CAUTION
ThIS
IS
a
severe
test
Perform
only
when
slippage
IS
suspected
not
penodlcally
Shppage
results
from
IDSufliclent
clutch
pedal
free
play
all
or
grease
on
the
clutch
disc
worn
pressure
plate
or
weak
sprmgs
Also
check
for
bIndIng
m
the
clutch
cable
and
lever
arm
which
may
prevent
full
engagement
2
Drag
or
failure
to
release
ThIS
problem
usually
causes
dIfficult
shIftIng
and
gear
clash
espeCially
when
downshIftmg
The
causes
may
be
excessive
clutch
pedal
free
play
warped
or
bent
pressure
plate
or
clutch
dISC
ex
cessive
clutch
cable
guide
sag
and
broken
or
loose
clutch
lmings
Check
conditIOn
of
mam
shaft
splines
3
Chatter
or
grabbing
A
number
of
thmgs
can
cause
tIns
Check
cable
gUIde
sag
and
tIghtness
of
transnusslOn
to
frame
and
engme
to
transmlSslon
mountIng
bolts
Check
for
worn
or
mISaligned
pressure
plate
and
misalIgned
release
plate
4
Other
nOIses
NOISe
usually
mdlcates
a
dry
or
defective
release
bearIng
Check
the
beanng
and
replace
If
neces
