Group
28
Ignition systems
Design and function
Co
mpensation funct
io
ns
B
c
D
Var
i
ants
T
he
three
different
t
ypes of
knock
sensor used are
above
.
Type
(
B
) is
used
on
EZ
-102K. and on EZ-117K and
E
Z-118K systems from 1985
t
o
1986
.
Type
(C) is
used on
EZ-116K
systems
from 1987
on,
as well
as on
EZ
-l17K
and
E
Z-118K, and
on Rex
-I
from 1989
on.
A
refinement
o
f
(
B
),
variant
fined
a sleeve
(5)
which ensures
that
th
e
mount
ing
for
ce is
less
easily
transmitted
to
th
e
piezoelectric
crys
ta
l, making
the unit
less sensitive
to the
effec
t
of
th
e
ti
gh
t
ening
torque
.
Type
(
0)
is
u
sed on
the
EZ
-
11
5K system on
the
B
280 eng
ine.
which
fitted with a knock
sensor
f
or each
bank
of
cylinde
r
s.
T
he
only
d
i
ff
erence between
th
is
var
ian
t
and type
(C)
that
the
connec
t
ion
lead
is
integ
r
a
l
w
i
th the
unit
.
Type
IC)
and
sensors are less sensitive
t
igh
ten
ing
torque than earlier
The design permits
the
torque
to
vary
from
15
to
25
Nm
'1
1
-
18
ft.lb)
w
it
hout
any adve
r
se
on
the performance
of
Ihe
Although production of type
was d
iscon-
t
inu
ed
in 1986
,
it is
interchangeab
l
e w
i
lh
type
Particular
care
muSI
be
taken when fining the older type
01
a
torq
ue
wrench
must
be
to l
i
ghten Ihe
in
pos
i
tion
.
•
Since the ignition may
be
retarded
i
n each
i
ndiv
i
dual
cylinde
r
in
the evenl
o
f
knock
.
the tIming
I
n
may vary by as much
as
ap
-
prox
.
10--15
·
,
from the
that knock
control
i
s
i
nherently
major
advantage
.
the facility of eliminating
i
t
an
individual
means
Ihat
fue
l
ut
i
lizat
i
on
can
be
in
relation to the knock
Ihre
shold in
each
.
ThIS
importanl
since
condi
tio
ns
in the various cylinders may differ somewhat in
terms
of combustion temperature
,
fuel
residue
deposits on cylinder
walls
. in-
jecto
r
design
,
and
so
on.
• R
e
lardat
ion of
t
he
ig
nition
in each
indivi
dual
cylinder is
a
f
eature
o
f
all systems equipped
w
ith
knock
senso
r
s
dealt with
in
th
is
manual.
•
S
h
ou
ld the
signals
f
rom
the kno
c
k
sensor be lost for any reason
.
most of
c
ontrol units
w
ill
retard the
ignition
by a
pre
-
programmed
'fa
i
l
-
safe' value 01 approx
.
31
