coil pack BMW M3 1995 E36 Workshop Manual
Page 68 of 759
113-2
CYLINDER
HEAD
REMOVAL
AND
INSTALLATION
0011s6i
-
0Fig
.
1
.
Front
exhaust
pipe
to
exhaust
manifold
mountíng
nuts
(arrows)
.
-1
~~
0013023
4
.
Remove
air
filter
housing
complete
with
mass
air
flow
Fig
.
3
.
Coolant
hose
connection
beneath
intake
manifold
on
M42
sensor
and
attached
hoses
and
ducting
.
See
Fig
.
2
.
engine
(arrow)
.
0011969
Fig
.
2
.
Air
filter
housing/air
intake
connections
on
M44
engine
with
traction
control
.
Clamp
atthrottle
housing
(A)
;
mass
air
flow
sensor
connector
(B)
;
and
clips
at
upper
air
filter
housing
(C)
.
Coolingsystem,
draining
5
.
Draincoolant
from
engine
block
and
radiator
.
See
170
Radiator
and
Cooling
System
.
NOTE-
"
The
block
drain
is
on
the
exhaust
sideof
the
engine,
near
cylinder
no
.
4
.
6
.
Disconnect
hoses
from
coolant
flange/thermostat
hous-
ing
on
frontof
cylinder
head
.
Unbolt
thermostat
housing
from
cylinder
head
.
CYLINDER
HEAD,
4-CYLINDER
7
.
On
M42
engines,
disconnect
hose
from
coolant
pipe
on
left
side
of
engine
.
See
Fig
.
3
.
8
.
Disconnect
heater
hoses
from
coolant
flange
on
rear
of
cylinder
head
.
Cylinder
head
cover,
removing
9
.
Remove
ignition
coil
pack
from
rightstrut
tower
.
See
Fig
.
4
.
0011995
"
The
radiator
drain
plug
is
on
the
bottomof
the
radiator
Fig
.
4
.
Cylinder
head
cover
showing
location
of
engine
breather
hose
on
the
driver's
side
.
Remove
small
plastic
lock
clipto
(A),
wiring
harness
duct
(B),
and
ignition
coil
pack
(C)
.
M44
pull
radiator
drain
plug
out
completely
.
engine
shown
.
Cover
on
M42
engine
is
similar
.
10
.
Disconnect
engine
breather
hose
from
cylinder
head
cover
.
Page 127 of 759
IGNITION
SYSTEM
DIAGNOSTICS
IGNITION
SYSTEM
SERVICE
Poor
driveability
may
have
a
variety
of
causes
.
The
fault
On
4-cylinder
engines,
an
ignition
coil
pack
is
mounted
to
may
lie
with
the
ignition
system,
the
fuel
system,
parts
of
the
the
passenger
side
strut
tower
in
the
engine
compartment
.
emission
control
system,
or
a
combination
of
the
three
.
Be-
The
coil
pack
integrates
4
individual
coils
.
cause
of
these
interrelated
functions
and
their
effects
oneach
other,
it
is
often
difficult
to
know
where
to
begin
looking
for
On
6-cylinder
engines,
an
ignition
coil
is
located
directly
problems
.
above
each
spark
plug
.
For
this
reason,
effective
troubleshooting
should
alwaysbe-
gin
with
an
interrogation
of
the
On-Board
Diagnostic
(OBD)
system
.
The
OBD
system
detects
certain
emissions-related
engine
management
malfunctions
.
When
faults
are
detected,
the
OBD
system
stores
a
Diagnostic
Trouble
Code
(DTC)
in
the
system
ECM
.
In
addition,
the
Check
Enginewarning
light
will
come
on
if
an
emissions-related
fault
is
detected
.
Two
generations
of
OBD
areusedon
the
cars
coveredby
this
manual
.
See
100
Engine-General
for
OBD
information
.
On-Board
Diagnostics
"
1992-1995
models
............
...
.
..
...
OBD
I
"
1996
and
later
models
.........
.......
..
OBD
II
NOTE-
"
On
carswith
OBD
ti,
specialized
OBD
11
scan
tool
equipment
mustbeused
to
access
DTCs,
either
using
the
BMW
special
tool
or
a
`generic"
OBD
11
scan
tool
.
"
The
OBD
11
fault
memory
(including
an
illuminated
Check
Engine
light)
can
only
be
reset
using
the
spe-
cial
scan
tool
.
Removing
the
connector
from
the
ECM
or
dísconnecting
the
battery
will
not
erase
the
fault
memory
.
Basic
Troubleshooting
Principies
An
engine
that
starts
and
runs
indicates
the
ignition
system
is
fundamentally
working-delivering
voltage
toat
least
some
of
the
sparkplugs
.
A
hard-starting
or
poor-running
engine,
however,
may
indicate
ignition
coil
problems,
cracked
or
dete-
riorated
spark
plug
wires
(4-cylinder
engines
only),
and
worn
or
fouled
spark
plugs
.
WARNING
-
Inefficient
combustion
(richair/fuel
mixture)
can
cause
the
catalytic
converter
to
overheat
and
plug
.
An
overheated
catalytic
converter
can
also
bea
tire
hazard
.
Checking
for
Spark
IGNITION
SYSTEM
120-
3
WARNING
-
If
a
spark
test
is
done
incorrectly,
damage
to
theen-
gine
control
module
(ECM)
or
the
ignitioncoil(s)
may
result
.
Checking
for
spark
is
difficult
onengines
with
distributorless
ignition
systems
.
Try
Rmovng
the
plugs
and
inspecting
for
differences
be-
tween
them
.
A
poor-firing
plug
may
be
wet
with
fuel
and/or
black
and
sooty,
butnot
always
.
If
a
coil
is
not
operating,
the
engine
management
system
will
electrically
disable
the
fuel
injectorto
that
cylinder
.
The
key
is
to
look
for
differences
be-
tween
cylinders
.
Ignition
coil,
testing
and
replacing
(4-cylinder
engine)
1.
Disconnect
mainharness
connector
from
coils
:
"
On
M42
engine,
remove
plastic
covering
from
coils
and
disconnect
individual
harness
connectors
.
"
On
M44
engine,
disconnect
main
harness
connectorat
end
of
coil
pack
.
See
Fig
.
3
.
Fig
.
3
.
Ignition
coil
pack
for
M44
engine
(arrow)
.
Coil
harness
con-
nector
shown
at1
.
IGNITION
SYSTEM
SERVICE
Page 128 of 759
120-
4
IGNITION
SYSTEM
2
.
Check
for
battery
voltage
o
cofs
.
If
voltage
is
not
Table
b
.
Ignition
Coil
Resistance
present,
check
wire
between
terminal
15
and
ignition
(M42
Engine)
switch
.
See
Electrical
Wiring
Diagrams
.
"
On
M42
engine,
connect
digital
multimeter
between
ter-
minal
15(+)
in
each
harness
connector
and
ground
.
See
Fig
.
4
.
"
On
M44
engine,
connect
voltmeter
between
terminal
2
(15+)
in
connector
and
ground
.
Turn
ignition
on
and
check
for
voltage
.
See
Fig
.
5
.
3
.
Turn
ignition
off
.
0
4a15
Fig
.
4
.
Ignition
coil
harness
connector
terminal
identification
for
M42
engine
.
Fig
.
5
.
Ignition
coil
harness
connector
terminal
identification
for
M44
engine
.
CAUTION-
The
wiring
to
the
coil(via
the
ignition
switch
15+)
is
not
fuse
protected
.
Use
care
when
testing
thiscircuit
.
4
.
Use
a
digital
multimeter
totest
coil
primary
resistance
.
"
On
M42
engine,
use
Table
b
asa
guide
to
check
coil
resistance
.
Make
checks
at
each
harness
connector
.
"
On
M44
engine,
use
Table,c
as
a
guide
to
check
coil
primary
resistance
.
5
.
Inspect
coil
housing
for
hairline
cracks
or
leaking
cast-
ing
material
.
See
Fig
.
7
.
A
leaky
ignition
coil
may
indi-
11502
cate
a
faulty
ECM
(engine
control
module)
.
Check
the
ECM
before
installing
a
new
coil
.
Fig
.
6
.
Ignition
coil
harnessconnector
terminal
identification
for
6-
cylinder
engine
.
IGNITION
SYSTEM
SERVICE
11502
Terminals
Resistance
(refer
to
Fig
.
4
.)
Coil
primary
1
(-)
and
15
(+)
10
.4-0
.8
ohms
Coil
secondary
N
.A
.
N
.A
.
Table
c
.
Ignition
Coil
Resistance
(M44
Engine)
Terminais
Resistance
(referto
Fig
.
5
.)
Coil
#1
primary
1
(-)
and
2
(+)
0
.4-0
.8
ohms
Coil
#2
primary
6
(-)
and2
(+)
0
.4-0
.8
ohms
Coil
#3
primary
7
(-)
and
2
(+)
0
.4-0
.8
ohms
Coil
#4
primary
5
(-)
and2
(+)
0
.4-0
.8
ohms
Coil
secondary
N
.A
.
N
.A
.
NOTE-
If
a
single
coilís
faulty
on
M44
engines,
the
complete
coil
pack
will
have
to
be
replaced
.
Ignition
coil,
testing
and
replacing
(6-cylinder
engine)
CAUTION-
Use
a
digital
multimeter
for
the
following
tests
.
1.
Remove
plastic
enginecovers
from
top
of
engine
by
prying
off
nut
covers
and
removingcover
mounting
nuts
.
See
113
Cylinder
HeadRemoval
and
Installa-
tion
.
2
.
Disconnect
harnessconnectorfromcof
.
Connect
mul-
timeter
between
terminal
15
(+)
in
connector
and
ground
.
See
Fig
.
6
.
3
.
Turn
ignition
on
and
check
for
batteryvoltage
.
"
If
batteryvoltage
is
not
present,
check
wire
between
terminal
15
and
ignition
switch
.
See
Electrical
Wiring
Diagrams
.
"mozo
Page 401 of 759
Component
Model
Year
Location
Refer
to
Heater
Recirculation
Flap
Actuator
1992-1998
Below
left
dash
right
side
of
steering
column
HeaterBlowerMotor
Resistor
Pack
1992-1998
Behind
center
of
dashboard
Heater
Regulator
FlapActuator
1997-1998
Right
side
of
heater
box
HeaterValve
Assembly
1992-1998
Left
rear
engine
compartment
HeatingNentilation
Relay
Box
1992-1993
Below
left
side
of
dash
HeatingNentilation
Relay
1994-1998
Left
front
footwell
High
Speed
Cooling
Fan
Relay
1992-1998
Power
distribution
box
Fig
.
2
.
Homs,
Right/Left
1993-1998
Front
of
engine
compartment
Horn
Relay
1992-1998
Power
distribution
box
Fig
.
2
.
Horn
Relay
(Alpine)
1994-1998
Behind
glove
compartment
Fig
.
8
.
Board
Computer/Anti-Theft
Fig
.
9
.
Idle
Speed
Control
Valve
1992-1995
Top
rearof
enginebehind
intake
manifold
(M42
engine)
Fig
.
11
.
Idle
Speed
Control
Valve
1992-1995
Top
left
side
of
engine
(M50
engine)
Idle
Speed
Control
Valve
1993-1996
Below
intake
manifold
(M50/S50US
engine)
Idle
Speed
Control
Valve
1996-1998
On
throttle
housing
(M44
engine)
Fig
.
15
.
Idle
Speed
Control
Valve
1997-1998
Left
front
of
engine
below
intake
manifold
(M52/S52US
engine)
Ignition
Coils
1992-1998
Right
of
engineunder
plastic
cover
(four-cylinder)
Fig
.
7
.
Ignition
Cofs
1992-1998
Top
of
engine
undercover
(six-cylinder)
Fig
.
17
.
Ignition
Switch
1992-1998
Right
sídeofsteering
column
Intake
Air
Resonance
Changeover
1992-1998
Leftrear
of
engine
compartment
Valve(DISA)
Intake
Air
Temperature
Sensor
1992-1995
In
mass
air
flow
sensor
(M42
engine)
Intake
Air
TemperatureSensor
1996-1998
In
top
ofair
filter
housing
(M44
engine)
Fig
.
12
.
Intake
Air
Temperature
Sensor
1992-1998
I
Left
sídeof
engine
in
intake
manifold
(six-cylinder)
-
-
I
Fig
.
13
.
Fig
.
14
.
Kick-Down
Switch
(A/T)
1
1992-1998
1
Left
footwell
Mixing
Actuators
1
1992-1998
1
Heater
box
ELECTRICAL
COMPONENT
LOCATIONS
610-15
Table
a
.
E36
Component
Locations
Knock
Sensors
1
1992-1998
1
Left
side
of
engine
block
Left
Front
Power
Window
Motor
11992-1998
/
Left
front
door
Left
Front
Window
Monitoring
Switch
1
1997-1998
1
Left
front
door
trim
panel
Left
Front
Window
Retraction
Switch
1
1992
-
1993
1
Left
front
door
handle
lock
assembly
Left
Splice
Panel
1
1992-1998
1
Under
left
side
of
dash
at
kick-panel
1
Fig
.
5
.
Main
Fuse
and
Relay
Box
(Power
1992-1998
I
Left
sideof
engine
compartment
Fig
.
2
.
Distribution
Box)
1
I
Mass
Air
Flow
Sensor
1992-1998
I
Left
side
of
engine,
intake
air
duct
Fig
.
7
.1
I
Fig
.
15
.
Continued
COMPONENT
LOCATIONS