24
EL
ECTRONIC
F
UEL INJECTION - AFC
The
P
orsc
he
912
E
is
equipped
with a motor that has a air flow controlled electronic fuel injection
.
Before we describe this unit
in
detail, a few words about the accelerator cable
.
Th
e
accel
era
tor cable is in two parts
.
The connector (arrow) is located within the engine compart
men
t
b
ehin
d the rear panel and is accessible when the cover to the guide channel is removed.
Construction and funct
i
o
n
o
f the ATC inj
e
ction
The component parts
1 Fuel Tank
2 Fuel Pump
3 Fuel Filter
4 Cold Start Valve
6
5 Fuel Injector
6 Pressure Regulator
7 Auxiliary Air Regulator
8 Throttle Switch
9 Air Filter
10 Temperature Sensor II
11
Battery
12 Ignition Switch
A Int
ak
e-air Sensor
B
Throttle valve
C
Air
Sensor Flap
o
Co
ntrol Unit
Principles of Operation
The amount of fuel that is to
be used
is
determined by
the
vo
l
ume
of
intake
air and the speed of the
motor.
The
injector sequence is determi
ne
d by th
e
i
gni
tion dis
tr
i
bu
tor
breaker
points
.
The fue
l
required for
c
old startin
g
is
injected b
y
t
h
e elect
r
o
-
magnetic cold start valve.
Warm-up
en
r
ichment of t
he
fuel mixture
is
via t
h
e
au
x
iliary
air regulator in conjunction with the
te
mpe
r
ature
s
ens
or
I in the in
t
ake-air
Se
n
so
r
housing and
t
he
temperature
sensor II in the cylinder
head.
Fuel m
i
xture enrichm
e
nt
for full load condi
t
io
ns i
s
by
me
a
ns
of a throttle switch
.
6
2
