Transmission Controlled; Fuel System - Datsun 1973 510 Repair Manual

EMISSION CONTROLS AND
FUEL SYSTEM
U5
3 Increase the
engme
speed
from
Idlmg
to
3 0003 500
rpm
The
plate of
the EGR control valve
diaphragm
and the
valve shaft should
move
upward
as
the
engIne
speed
IS
mcreased
4 Disconnect
the EGR solenOId valve
electrIcal leads and
connect
them di
rectly
to
the vehICle
s
12
volt electrIcal
supply battery
Race tlte engme agam
With the EGR solenOId valve connected
to
a
12
volt
power source
The
EGR
con
trol valve should
remaIn stationary
5 WIth the
engine runmng
at
Idle
push
up
on
the EGR control valve dia
phragm
WIth
your
finger
When
thiS
IS
done the
engme
Idle should become
rough
and
uneven
Inspect the
two
components
of the
EGR
system
as
necessary
m
the follow
mg
manner
EGR valve removal
a
Remove
the
EGR control valve
from the mtake mamfold
b
Apply
4 7 5 1
m
Hgofvacuum
to
the EGR control
valve
by
suckmg
on a
tube attached
to
the outlet
on
top of the
valve The valve should
move
to
the
full
up
pOSItIon The valve should
re
mam
open
for
more
than 30
seconds
after the
apphcatIon
of
vacuum IS
diS
continued and
the
vacuum
hose
IS
blocked
c
Inspect
the EGR valve for
any
signs
of
warpage
or
damage
d Clean the EGR valve
seat
With
a
brush and
compressed
au
to
prevent
cloggmg
e
Connect the EGR solenoid valve
to
a
12
volt DC
power
source
and
no
tice
If tlte valve clIcks when
mtenmt
tently
electrified If the valve clicks
It
IS
considered
to
be
workIng
properly
f Check
the EGR
temperature
sensmg
sWitch
by
removmg
It
from the
engine
and
placmg
It
m a
contamer
of
water
together With
a
thermometer
Connect
a
self
powered
test
hght
to
the
two
electrical leads
of
the sWitch
g
Heat the
con
tamer
of
water
h
The sWitch should conduct
cur
rent
when the
water
temperature
IS
below
770 F and stop
conducting
cur
rent
when the
water
reaches
a tempera
ture
somewhere between
880 1060 F
Replace
the SWItch If
It
functions other
wise
TRANSMISSION
CONTROLLED
SPARK SYSTEM
The
TransmissIOn
Controlled Spark
System
TCS
was
mtroduced
on
the
1972 A12 engIne
and
IS now
used
on
most
models
The
TCS
system
consists
of
a
thermal
vacuum
valve
a vacuum
sWltchmg
valve
a
high
gear
detectIng
SWitch
and
a
number
of
vacuum
hoses
BaSICally
the
system IS
deSigned
to
re
tard full
spark
advance except when the
car IS m
high
gear
and the
engme
IS
at
normal
operatIng temperature
At all
other
times
the spark advance
IS
retarded
to
one
degree
or
another
Inspection
and
Adjustments
Normally
the
TCS system should be
trouble free
However If
you
suspect a
problem
m
the
system
first check
to
make
sure
all
wlnng connections
are
clean and
tight
and that all the
vacuum
hoses
are
properly connected Also
check
to
make
sure
the
dlstnbutor
vacuum
ad
vance IS
workIng properly
If
everythmg
appears
all nght
connect
a
tImmg
hght
to
the
engme
and make
sure
InItial tImmg
IS
correct
Run the
engme
until
It
reaches
normal
operatmg temperature
and then
have
an
assistant Sit
m
the
car
and shift
the
transmiSSIOn through
all the
gears
slowly
If the
system
IS
functiOnIng
prop
erly
the timIng
Will be 10
to
15
degrees
advanced
m
high
gear
compared
to
the
other
gear
posItions
If the system
IS
still
not
operatmg
correctly
you
Will have
to
check for contInUIty
at
all the
connec
tions
With
a
test
lIght
AIR
INJECTION
REACTOR
SYSTEM
ThiS system
IS
used
on
1974
and
later
models
In
gasohne
engInes
It
IS
dIfficult