24
ELECTRONIC FUEL INJECTION - AFC
Troubleshooting:
Thermo switch:
Engine temperature under 10°C/
50°F. Remove
the plug
from
the
cold start
valve
and connect a
test lamp
.
Disconnect the wire
from contact 1
on the
ignition
coil.
Operate the
starter
motor
:
the test lamp must initially be
bright
and
then
visibly darker
within not less than 11 seconds.
Cold start valve
:
Connect
a
pressure gauge to
the
ring supply line
.
Operate the starter motor in
order
to reduce
the fuel
pressure.
Remove
the
plug from the
cold
start
valve
.
Conne
ct
the
cold
start
valve
by means of
extra
wi
res
to ground and contact
15
on
the
ignition coil.
Turn
on the
ignition
switch -
the fuel pressure
must fall.
Cold Starting Valve
The
co
ld starting valve
is
located in
intake
air distributor and is activated
by
a thermo time
switch
which is located
adjacent to the
intake
air distributor.
Her
e
are a few
tips concernig
trouble free operation
of engines equipped
with AFC injection
.
All
ai
r lines
and
hos
es
and
the intake
-ai
r
sensor
must b
e
absolutely air
tight
.
The
sensor flap
mu
st be
able
t
o move fr
e
ely over its entire range and not
stick
at
any
point.
All e
le
ctrical
connections
must
be
tight and free of corrosion
.
Plug and socket
color
code: Fuel injector
:
white
Cold
start
valve
:
blue
Thermo time switch
:
brown
Intake-air
sensor:
black
When the vacuum line is disconnected, the fuel pr
ess
ure must be about 36 psi.
Ignition timing and vaive adjustment must be correct
.
For
idle
and CO adjustment
:
I
dle
is
by adjusting the
screw
on
t
he throttl
e
hou
sing
.
Nom
in
al
v
al
u
e:
925 ±
50 rpm
T
he
CO
valu
e
is fa
cto
ry adjus
ted by
me
ans
of
the
bye-
p
ass
a
dj
ustm
e
nt screw in the in
t
ake-air sensor
hou
sing.
The posi
tion
of
this
screw
shou
ld
be
altered o
nly when the
no
m
ina
l value
of 0.
5
-
1
.2
%
CO
ca
n
no
t be o
btained
inspi
t
e
perfect
wo
rkin
g order of th
e
engine
.
T
h
e
CO-adjus
t
men
t
sc
r
e
w is
covere
d
by a
plug.
(
Part
No. 923.606
.
991
.
01)
Pl
u
g
c
o
l
or
c
od
e
:
Bl
ack
:
Bo
sc
h
setting
Blu
e
:
P
r
oduction
setting
Red:
Serv
ice
s
etti
ng
13
