tow BMW M3 1998 E36 User Guide

116-2



CYLINDER
HEADAND
VALVETRAIN

3
.
Remove
timing
chain
sprockets
and
timing
chains
from



7
.
Slowly
release
pressure
oncamshaft
bearing
capsby
camshafts
.
Remove
upper
timing
chain
guidefrom
cyl-



turningeccentric
shaft
.
Remove
bearing
caps
and

inder
head
.
See117
Camshaft
Timing
Chain
.



camshaft
.
Repeat
procedureon
remaining
camshaft
.

NOTE-

It
is
not
necessary
lo
remove
the
lower
timing
chain
cover
.

4
.
Remove
spark
plugs
and
instaf
BMW
special
tool
11
3

260
to
cylinder
head
.
Tighten
tool
retaining
bolts
in

spark
plug
holes
.
Do
not
over-tighten
bolts
.
See
Fig
.
1
.

6
.
Remove
bearing
cap
mounting
nuts
.

0013033

5
.
Turn
eccentric
shaft
on
special
tool
until
pressure
is
ap-

plied
to
camshaft
bearing
caps
.
See
Fig
.
2
.

Fig
.
2
.



Special
tool
(eccentric
shaft)
being
turned
to
apply
pressure
to
camshaft
bearing
caps
.

CYLINDER
HEAD,
DISASSEMBLYAND
ASSEMBLY

CAUTION-

Camshaft
bearing
caps
mustbe
reinstalled
intheir
original
locations
.

NOTE-

"
The
camshaft
bearing
caps
are
coded
wíth
a
letter
anda
number
.
Forexample,
"Al
"ís
the
exhaust
cam-

shaft
bearing
cap
at
the
front
of
the
engíne,
and
"El"
is
the
intake
camshaft
bearing
cap
at
the
front
of
the
engine
.

"
Camshafts
are
stamped
with
a
code
letter-`E"
for
the
intakeside
and
`A"forthe
exhaust
side
.

"
"E"
isforEinlal3,
(German
for
íntake)
and
A"
isfor
Auspuff,
(German
for
exhaust)
.

"
The
front
of
the
engine
is
at
the
front
of
thecar
.

8
.
Camshaft
installation
is
reverse
of
removal,noting
the

following
:

"
Prior
to
installation,
check
al¡
components
for
wear
as

described
below
underCylinder
Head
and
Va¡-

Fig
.1
.



Special
BMW
tool
no
.
11
3
260
.
Tool
mounting
bolts
(arrows)



vetrain,
Reconditioning
.

thread
into
spark
plug
holes
.



"
Crankshaft
must
be
at
least
45°
away
from
TDC
before

installing
camshafts
to
cylinder
head
.

"
Lubricate
camshafts
prior
to
installation
.

Tightening
Torque



"
Install
camshafts
into
cylinder
head
with
lobes
for
cyl-

"
BMW
special
tool
11
1
260



inder
no
.
1
pointing
up
and
towards
each
other
.

to
cylinder
head
.
...
.
.
...........
23
Nm
(17
ft-Ib)



"
After
installing
camshafts),observe
specified
waiting

time
for
hydraulic
cam
followers
to
fully
compress
be-
fore
bringing
crankshaft
back
to
TDC
.

116-
6



CYLINDER
HEAD
AND
VALVETRAIN

9
.
Camshaft
installation
is
reverse
of
removal,noting
the

following
:

"
Prior
to
installation,
check
al¡
components
for
wear
as
described
below
under
Cylinder
Head
and
Val-

vetrain
Reconditioning
.

"
Crankshaft
must
be
at
least
45°
away
from
MC
before

installing
camshafts
to
cylinder
head
.

"
Lubricate
camshafts
prior
to
installation
.
"
Insta¡¡
camshafts
into
cylinder
head
with
lobes
for
cyl-
inder
no
.
1
pointing
up
and
towards
each
other
.
See
Fig
.
8
.

"
After
installing
camshaft(s),
observe
specified
waiting

time
for
hydraulic
cam
followers
to
fully
compress
be-

fore
bringing
crankshaft
back
to
TDC
.

Fig
.
8
.



Camshaft
correctly
positioned
for
reassembly
so
thatcylinder
no
.
1
lobes
(arrows)
face
each
other
.

Tightening
Torques

"
Camshaft
bearing
caps
to
cylinder
head
(M7)
.
..
...
..
.
....
15
Nm
(11
ft-Ib)
"
Cylinder
head
cover
to
cylinder
head
(M6)
..
.
..........
10
Nm
(89
in-lb)

"
Primary
timing
chaintensioner
to
cylinder
head-see
117
Camshaft
Timing
Chain
"
Spark
plugs
(M12)
.............
.
.
23
Nm
(17
ft-Ib)

"
Timing
chain
sprocket
to
camshaft
flange
(M6)-see
117
Camshaft
Timing
Chain

CYLINDER
HEAD,
DISASSEMBLYAND
ASSEMBLY

Valves,
removing
and
installing

1
.
Remove
cylinder
head
as
described
in
113
Cylinder

HeadRemoval
and
Installation
.
Remove
exhaust

manifold(s)
.

2
.
Remove
camshafts
using
special
tools
as
descríbed

earlier
.

3
.
On
M42
and
al¡
6-cylinder
engines
:
Remove
camshaft

carriers
by
pulling
them
straight
up
off
mounting
studs
.

CAUTION-

"
Do
not
let
the
hydraulic
cam
followers
fa¡¡
out
as
the
camshaft
carrier
is
removed
.
Special
suction
cupsare
available
from
BMW
to
hold
the
hydrau-
lic
cam
followers
in
place
during
carrier
removal
.
Camshaft
installation
waiting
times

"
at
or
above
68°F
(20
0
C)
....
..
.
..
......
10
minutes

"
50-68°F
(10-20°C)
...
.
..
....
.
..
......
30
minutes

"
32-50°F
(0-10°C)
....
.
..
....
.
..
......
75
minutes
4
.
On
M44
engines
:
Remove
all
hydraulic
valve
adjusters
.
See
Hydraulicvalve
adjusters,
checking
and
re-
"
Reinstall
timing
chainsprockets
and
tensioner
as
spe-



placing
(M44
engine),
later
in
this
section
.
cifically
described
in
117
Camshaft
Timing
Chain
.
"
Waít
at
least
10
minutes
before
cranking
engine
over



CAUTION-
withstarter
motor
for
the
first
time
.



Hydraulic
valve
adjusters
should
be
stored
in
an
upright
position
.
lf
necessary,
use
amagnetic
tool
to
aid
in
removal
of
the
adjusters
.

"
Hydraulic
cam
followers
shouldbe
stored
in
an
upright
position
.

5
.
Remove
valves
using
a
valve
spring
compressor
.

NOTE-

"
The
M44
cylinder
head
has
recessed
valve
stems
.
This
requires
the
use
of
a
special
valve
spring
com-
pressor
tool
.

"
Label
each
valve
assembly
as
it
is
removed
so
it
can
be
installed
in
its
original
position
.

6
.
Remove
and
discard
valve
stem
oil
seals
from
valve
guides
.
See
Valve
stem
oil
seals
later
in
this
section
.

7
.
Valve
installation
is
reverse
of
removal
.

"
Reinstall
exhaust
manifold(s)
with
new
gaskets
.
Use
Molycote
HSC'
5
or
equivalent
anti-seize
thread
com-
pound
on
fasteners
.

Tightening
Torque

"
Exhaust
manifold
to
cylinder
head
M7
............
..
...
....
.
...
..
20
Nm
(15
ft-Ib)

117-2



CAMSHAFT
TIMING
CHAIN

CAMSHAFT
TIMING
CHAIN,

4-CYLINDER

Special
BMW
service
tools
are
needed
for
timing
chain
re-
moval
and
installation
procedures
.
The
special
tools
assure

proper
timing
of
the
valvetrain
.
Precíse
marks
to
setthe
timing

on
the
camshafts
are
not
provided
for
reassembly
.
Read
the

procedures
through
before
beginning
the
job
.

CAUTION-

lf
the
camshaftsare
not
properly
timed,
the
pis-
tons
can
contact
thevalves
.

Camshaft
timing
chain,
removing

(4-cylinder
engines)
U0119-

Fig
.
3
.



Upper
timing
chain
covermounting
bolts(arrows)
.
Thermo-
1
.
Disconnect
negative
(-)cablefrom
battery
.



stat
housing
shown
removed
.
Cylinder
ídentification
sensor
(A)
also
shown
.

CAUTION-

Prior
to
disconnecting
the
battery,
read
the
battery
disconnection
cautions
given
at
the
front
of
this
manual
on
page
viii
.

2
.
Drain
engine
coolant
.
Drain
engine
block
byremoving
block
drain
.
Remove
radiator
cooling
fan
shroud
and
cooling
fan
.
See
170
Radiator
and
Cooling
System
..

WARNING
-

Allow
the
engine
to
cool
before
openingor
draining
the
cooling
system
.

CA
UTION-

On
cars
with
viscous-type
fan
clutch,
fan
has
left
hand
threads
.

NOTE-

The
block
drain
plug
is
located
on
the
exhaust
sideof
the
engine,
below
cylinder
no
.
4
.

3
.
Remove
cylinder
head
cover
.
See
113
Cylinder
HeadRemoval
and
Installation
.

NOTE-

Make
note
of
the
arrangement
of
the
rubber
insulators
when
removing
the
cylinder
head
cover
mounting
belts
.

4
.
Loosen
sparkplugs
.
See
120
Ignition
System
.

5
.
Disconnect
coolant
hoses
from
thermostat
housingon
front
of
cylinder
head
.
Unbolt
thermostat
housing
from
cylinder
head
.

6
.
Remove
cylinder
identification
sensor
from
upper
tim-
ing
chain
cover
.
Remove
upper
timing
chain
cover
.
See
Fig
.
3
.

CAMSHAFT
TIMING
CHAIN,
4-CYLINDER

7
.
Set
engine
to
approximate
TDC
by
rotating
in
normal
operating
direction
until
camshaft
lobes
at
cylinder
no
.

1
are
facing
up
and
toward
each
other
.
See
Fig
.
4
.

0011998
Fig
.
4
.



Engine
set
to
approximate
TDC
.
Cylinder
no
.
1
camshaft
lobes
face
in
and
sprocket
arrows
point
up
(arrows)
.

8
.
Remove
air
conditioning
drive
belt
.
Loosenand
push
aside
air
conditioning
compressor
.
Remove
air
condi-
tioning
compressor
mounting
bracket
.
See
640
Heat-
ing
and
Air
Conditioning
.

9
.
Remove
engine
drive
belts
and
coolant
pump
pulley
.
See
020
Maintenance
Program
.

10
.
Secure
crankshaft
vibration
damper
to
prevent
crank-
shaft
from
turning
.
Using
a
socket,
loosen
vibration
damper
hub
center
bolt
.

117-
1
0



CAMSHAFT
TIMING
CHAIN

21
.
On
1993
and
lates
engines
:
Remove
access
plugs
from



24
.
On
1993
and
later
engines
:

VANOS
control
unit
in
front
of
exhaust
camshaft



"
Remove
VANOS
control
unit
as
described
laterinthis
sprocket
.
Remove
4
bolts
from
exhaust
camshaft



repair
group
.
sprocket
(useTono
El0
socket)
.
See
Fig
.
26
.



"
Remove
intake
camshaft
sprocket
mounting
nuts
.

"
Remove
intake
and
exhaust
sprockets
together
with

secondary
chain
.
Note
location
of
thrust
washers
and

spring
plate
(where
applicable)
on
intake
sprocket
.

Fig
.
26
.
Exhaust
camshaftmounting
bolts
(arrows)
.

CAMSHAFT
TIMING
CHAINS,
6-CYLINDER

0013056

22
.
Depress
secondary
timing
chain
tensiones
and
lock

down
by
inserting
stiff
wire
into
the
openings
in
rear
of
tensioner
.
See
Fig
.
27
.

Fig
.
27
.
Secondary
timing
chaintensioner
being
locked
down
on
M50
engine
.
Press
tensioner
downand
insert
locking
wire
through
holes(arrows)
.
Tensioner
on
M52/S52
US
engines
vary
slight-

23
.
Remove
secondary
chain
tensioner
and
lift
out
primary
chain
guide
.

NOTE-

Hold
the
camshaft
stationary
(at
hex
on
camshaft)
when
loosening
ortightening
sprocket
mounting
boits
.

CAUTION-

The
crankshaft
must
not
be
allowed
to
rotate
once
the
timing
chain
is
removed
.
The
pistons
can
con-
tact
the
valves
.

25
.
On
1992
engines
:

"
Remove
from
intake
and
exhaust
sprocket
mounting

bolts
.
"
Remove
sprockets
together
with
secondary
chain
.

26
.
Remove
bolts
holding
lower
timing
chain
cover
to
cylin-

der
head
(use
Torx
E8
socket)
.
See
Fig
.
28
.

MR111:
R

Fig
.
28
.
Cylinderhead-to-timingchain
covermounting
bolts
(arrows)
.

27
.
Using
a
drift,
drive
two
locatiog
dowels
in
left
and
right

sides
of
lower
timing
chaincover
toward
rear
of
car
.
Re-
move
covermounting
boits
and
carefully
lift
cover
off
.
See
Fig
.
29
.

CA
UTION-

Use
care
when
removing
the
cover
from
the
cylin-
der
head
gasket
.
If
the
cover
is
stuck,
useasharp
knife
to
separate
it
from
the
head
gasket
.

117-
1
8



CAMSHAFT
TIMING
CHAIN

CAUTION-

It
is
crítical
that
the
exhaustcamshaft
sprocket
be

turned
only
the
mínimum
amount
necessary
to

engage
the
gear
cup
.
If
this
procedure
is
done
ín-
correctly,
the
VANOS
system
may
not
function

throughout
íts
full
range
.

NOTE-

As
the
control
unit
isinstalled,
the
secondary
sprockets
will
rotate
in
the
counterclockwise
direction
.
It
may
be

necessary
to
guide
sprockets
counterclockwise
as
the

control
unit
is
installed
.

8
.
On
cars
built
from3/95
:
Use
a
spanner
tool
(See
Fig
.

39
.),
turn
exhaust
sprocket
counterclockwise
(as

víewed
from
front
of
engine)
only
enough
to
mesh

gear
cup
splines
with
camshaftgear
.
Slowly
push

VANOS
control
unit
towards
camshaft
until
it
is
fully

seated,guiding
chains
in
counterclockwise
direction
.

CA
UTION-

Ensure
that
the
first
available
tooth
engages
.

9
.
Install
and
tightencontrol
unit
nuts
and
bolt
.

10
.
Connect
harness
connector
to
VANOS
solenoid
.
Using

new
seals,
insta¡¡
oil
line
fitting
.

Tightening
Torques

"
VANOS
control
unitto
cylinder
head

M6
nut
.....
..
..
.
.
.............
10
Nm
(89
in-lb)

M8
bolt
.....
.
.
.
.
..
.............
22
Nm
(17
ft-Ib)

"
VANOS
oil
supply
line
to
control
unit
.
32
Nm
(24
ft-Ib)

11
.
Slowlyunlock
and
release
secondary
chain
tensioner
.

12
.
Preloadprimary
chain
by
tightening
BMW
special
tool

no
.
112
240
(dummy
chain
tensioner)
to
1
.3
Nm
(11
in-
lb)
.
Then
tighten
exhaust
camshaft
sprocket
mounting

bolts
alternately
in
two
stages
.

Tightening
Torque

"
Secondarytiming
chain
sprockets
to
camshafts

(Tora
boits)

Stage
1
..
...............
...
.
.
...
5
Nm
(44
in-lb)

Stage
2
..
...............
...
.
.
..
22
Nm
(17
ft-Ib)

VANOS
(VARIABLE
VALVE
TIMING)

13
.
Remove
flywheel
locking
tool
from
transmission
bell-

housing
.
Remove
camshaft
locking
tool
from
rear
of

cylinder
head
.

14
.
Turn
engine
over
by
hand
at
least
two
fui¡
crankshaft
ro-

tations
.
Reinstall
camshaft
locking
tool
and
flywheel

locking
toolto
make
sure
all
adjustments
are
correct
.
If

settings
are
correct,
remove
locking
tools
.

15
.
Remove
BMW
special
tool
112
420
(dummy
chain
ten-
sioner)
from
side
of
cylinder
head
.
Install
primary
chain

tensioner
so
that
cutout
in
tensioner
piston
engages

chain
rail
.
See
Fig
.
34
.
Using
new
seals,
install
and

tighten
access
plugs
in
VANOS
control
unit
.

Tightening
Torque

"
Access
plugs
to

VANOS
control
unit
.
..
.
.....
.
..
...
50
Nm
(37
ft-lb)

"
Primary
timing
chain
tensioner
plug
to
tensioner
sleeve

M50/S50USengine
.
.
..
.
.
...
.
...
..
50
Nm
(37
ft-Ib)

M52/S52US
engine
...
..
...
...
...
40
Nm
(30
ft-Ib)

16
.
Install
oil
baffle
cover
above
intake
camshaft
.
Install

three
cylinder
head
covermounting
studs
to
rear
of

head
.
Instali
cylinder
head
cover
.

Tightening
Torque

"
Cylinder
head
cover

to
cylinder
head
(M6
screws)
......



10
Nm
(89
in-Ib)

17
.
Installationof
remaining
parts
is
reverse
of
removal
.

NOTE-

Be
sure
to
install
the
ground
wíres
at
the
cylinder
head
cover
mounting
studs
and
at
the
front
of
the
cylinder
head,
if
applicable
.

119-
6



LUBRICATION
SYSTEM

17
.
Raise
engine
as
much
as
possible
.
Check
carefully
for



22
.
Installation
is
reverse
of
removal
.

obstructions,
wiring
harness
clearance
and
pinched

hoses
or
lines
as
engine
is
raised
.



"
When
installing
oil
pan,
apply
a
b



d
of
non-hardening

sealing
compound
(3-Bond
1209
0
or
equivalent)
to

18
.
Remove
oil
pan
mounting
bolts
and
lower
oil
pan
to



front
and
rear
end
cover
seam
areas
on
block
.

subframe
crossmember
.



"
Position
oil
pump
pickup
tube
and
oil
pan
onto
block

and
install
pickup
tube
using
a
new
gasket
.

"
Be
sure
tab
on
gasket
faces
down
towards
intake
of

NOTE-



pickup
tube
.
If
the
oil
pan
does
not
separate
easily
from
the
engine



"
Tightenforward
oil
pan
screws
first,
then
tighten
rear
.

cylinder
block,
afew
taps
with
arubber
mallet
should



"
Fill
engine
with
oil
as
described
in
020
Maintenance
break
it
free
.
Do
not
pry
the
oil
pan
loose
.



Program
.

"
After
adding
engine
oil,
start
and
run
engine
.
Raise
en-

19
.
Remove
oil
pump
sprocket
mounting
nut
.
See
Fig
.
9
.



gine
speed
to
2,500
rpm
until
oil
pressure
warning

Lift
sprocket
off
together
with
drive
chain
.



lampgoes
out(about
5seconds)
.

Fig
.
9
.
Oil
pump
sprocket
mounting
nut
(left-hand
thread)
on
6-cylin-



OII
pan,
removing
and
installing

derengine(arrow)
.



(6-cylinder
engine,
1993
and
later
modeis)

NOTE-

The
oíl
pump
sprocket
nut
has
left
hand
threads
.

20
.
Unbolt
oil
pump
pickup
tubefrom
oil
pump
.
Unbolt
oil

pump
from
engine
block
.
See
Oil
pump,
removing

and
installing
(6-cylinder
engine)
.

21
.
Remove
oil
pan
from
rear
.

Tightening
Torques

"
Engine
mount
to

suspension
crossmember(M10
nut)
..
42
Nm
(31
ft-Ib)

"
Oil
pan
to
engine
block
(M6
bolt)

8
.8
grade
....
..
.
...
...
.
........
10
Nm
(89
in-lb)

10
.9
grade
.
.
..
.
..
...
.
.
.
.
.
.....
12
Nm
(106
in-lb)

"
Oil
pump
to
engine
block
.
...
...
.
..
22
Nm
(16
ft-Ib)

"
Oil
pump
sprocket
to
oil
pump
shaft

(M1
0x1
left-hand
thread)
...
..
.
.
..
.
25
Nm
(18
ft-Ib)

"
Power
steering
pump
to
bracket

(self-locking
nuts)
.....
.
....
..
.
...
22
Nm
(16
ft-lb)

"
Power
steering
pump
bracket
to
engine

block
or
oil
pan
(self-locking
nuts)
.
..
22
Nm
(16
ft-Ib)

NOTE-

Cars
built
after
9/92
use
a
different
suspension
cross-

member
¡han
earfier
productíon
cars
.
Oil
pan
removal

procedure
on
the
later
cars
requíres
that
the
engine
be

supported
from
aboye
and
the
front
suspension
cross-

member
be
unbolted
and
loweredfrom
the
chassis
.

1
.
Raisecar
and
place
securely
on
jackstands
.

2
.
Remove
splash
shield
fromunder
engine,
if
applicable
.

3
.
Drain
engine
oil
as
descríbed
in
020
Maintenance
Pro-

gram
.

4
.
Remove
alternator
cooling
duct
from
alternator
and
ra-

diator
support
.

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

120-8



IGNITION
SYSTEM

1



1
.0
GN



1
.0
Gl
.0
GN
I



Ign
coil



1
.0
GN
.

Tti



%ti



r,



_%ti
_



_
ice_
I



25



52
5524



51



54



56
I



Power
input



power
input

t



U



Engine
Control
Module
(Bosch
DME
Ml
.7)



II



Powerinput
Mainrelaycontrol
I
15
42



43



16442868
67



34
6
26



27
1
-----



__
V



_



--



_

~
8K



.35
BK
.35
13,1
1



.35
YE



1



.35
BK35
VE
.35

3



cyl
.1

1

11

E

S
2

1
.0
BR

2
.5
BR

Ign
.
coil
cyl
.
3



II

Ign
.
coil



Ign
.
coil
3



cyI
.
2



1
Y
_
Y
2



k
3



cyl
.
4

IGNITION
SYSTEM
SCHEMATICS

Battery
voltage
in
run
or
start
(
vía
ignition
switchterminal
15)



WIRING
COLOR
CODE
4
.0
GN

1
.0
BR'V
.

Camshaft
Knock
Sensor
Knock
Sensor



Position
(cyl
.1-2)
(cyl
.3-4)



Sensor

Fig
.
13
.
Bosch
DME
M1
.7
ignition
system
circuit
for
M42
engine
.

Ground
(RH
rearof
engine
compartment,
rear
of
shock
tower)

N[INS

Crankshaftlrpm
Position
Sensor

Battery
voltage
in
run
or
start
(vía
main
relay
terminal
87)

Ground
(RH
rearof
engine
compartment,
rearof
shock
tower)

5GN

BK
-
BLACK
BR
"
BROWN
RD
-
RED
YL-
YELLOW
GN
-
GREEN
BL
-
BLUE
VI
-
VIOLET
GY
-
GREY
WT
-
WHITE
PK
-
PINK

Warning
:
Lethal
voltagepresent

Battery
voltage
at
all
times
to
Main
relay
(terminal
85)

'Y
Y

---------------------

0013087

^1
.5WT
^1
.5RD
^1
.5YL
^1
.5BL
r



--__



____-



__-_



___-_



-___-_____--__--



-____-___



____-
i
26
g
5022
23



54



5

I



Power
input



power
input
I



Engine
Control
Module
(Bosch
DME
M5
.2)



I
I



grounds



I
P
owerinput



Main
relay
control



I
70
40



71



21



2078



34
55
626



27
----------------------
-
---------
-
--
-
------------
-
-----------
.,



v
1
1
.1



v
`
1
35BK



35BK

2
(



1Y



¡3



194

Knock
Sensor
Knock
Sensor
(cyl
.1-2)
(cyl
.3-4)

Frommain
relay
terminal
87
(battery
voltage
in
run
or
start

Battery
voltage
in
run
or
start
(
via
ignition
switch



Warnin
terminal
15)



Lethal
óltage



WIRING
present



COLOR
CODE
2
.5
GN



'

1
.0
YL



/
1
.0
BL



/
1
.0
RDNJT

.35
BK
/



/
.35
BK

Camshaft
Position
Sensor
-_

Fig
.
14
.
Bosch
DME
M5
.2
ignition
system
circuit
for
M44
engine
.

Ground
(RH
rear
of
engine
compartment,
rearof
shock
tower)

Crankshaftirpm
Position
Sensor

IGNITION
SYSTEM



120-9

Batteryvoltage



Battery
voltage
in
run
or
start



in
run
or
start
(via
main
relay



(
via
ignition
switch
terminal
87)



terminal
15)

BK
-
BLACX
BR
-
BROWN
RD
-
RED
YL
-
YELLOW
GN
-
GREEN
BL
-
BLUE
VI
-
VIOLET
GY
-
GREY
WT
-
WHITE
PK
-
PINK

Battery
voltage
at
all
times
to
Main
relay
(terminal
85)

Ground
(RH
rear
of
engine
compartment,
rearof
shock
tower)



0012721

lGNITION
SYSTEM
SCHEMATlCS

120-10



IGNITION
SYSTEM

Ground
(rear
of
engine
compartment,
rear
of
passenger
side
shock
tower)

.!
BK

Camshaft
Position
Sensor

IGNITION
SYSTEM
SCHEMATICS

Batteryvoltage
in
run
or
start
(
via
ignition
switch
terminal
15)

---------------------------------------------------------
55



S5154
i

power
input



Power
input



1
DME
Control
Module(Bosch
DME
M3
.1)

Ground
-
(RHrear
of
enginecompartment,
rearof
passenger
side
shock
tower)

Fig
.
15
.
Bosch
DME
M3
.1
usedon1992
M50
engines(without
VANOS)
.

.EBK

Crankshaftlrpm
Position
Sensor

5GN

1.0
RD

Ground
(RH
rearof
enginecompartment,
rear
of
passenger
side
shock
tower)

WIRING
COLOR
CODE

BK
-
BLACK
BR
-
BROWN
RD
-
RED
YL
-
YELLOWGN
-
GREEN
BL
-
BLUE
VI-
VIOLET
GY
"
GREY
WT
"
WHITE
PK
-
PINK

Batteryvoltage
in
run
or
start
(
via
main
relay
Battery
voltage



terminal
87)
in
run
or
start
(via
ignition
switch
terminal
15)

11508

1
grounds



Main
rela
control
P
ower
Input



Y



I
-
34
---"--
6
26
27
1

Battery
voltage
at
all
times
to
Main
relay
(terminal
85)