fuel tank BMW 318i 1996 E36 Workshop Manual
[x] Cancel search | Manufacturer: BMW, Model Year: 1996, Model line: 318i, Model: BMW 318i 1996 E36Pages: 759
Page 3 of 759
General
Data
and
010
FundamentalsfortheDo-lt-YourselfOwner
Maintenance
020
Maintenance
Program
Engine
Transmission
Suspension,
Steering
and
Brakes
4
Body
100
Engine-General
110
Engine
Removal
and
Installation
113
Cylinder
Head
Removal
and
Installation
116
Cylinder
Head
and
Valvetrain
117
Camshaft
Timing
Chain
119
Lubrication
System
200
Transmission-General
210
Clutch
230
Manual
Transmission
510
Exterior
Trim,
Bumpers
520
Seats
Bo
y
Equipment
512
DoorWTdws
540
nr
t
513
InteriorTrim
541
Convertible
Top
515
Central
Locking
and
Anti-Theft
600
Electrical
System-General
620
Instruments
Electrical
S
stem
610
Electrical
Component
Locations
630
Exterior
Lighting
611
Wipers
and
Washers
640
Heating
and
Air
Conditioning
6
612
Switches
and
Electrical
Accessories
650
Radio
Equipment
and
720
SeatBelts
Accessories
721
Airbag
System
(SRS)
Electrical
Wiring
Diagrams
Foreword
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v
Warnings
and
Cautions
.....
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.vii
Index
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..
back
of
book
300
Suspension,
Steering
and
330
RearSuspension
Brakes-General
331
Final
Drive
310
Front
Suspension
340
Brakes
320
Steering
and
Wheel
Alignment
400
Body-General
411
Doors
410
Fenders,
Engine
Hood
412
Trunk
Lid
120
Ignition
System
121
Battery,Starter,
Alternator
130
Fue¡
Injection
160
Fuel
Tank
and
Fuel
Pump
170
Radiator
and
Cooling
System180
Exhaust
System
240
Automatic
Transmission
250
Gearshift
Linkage
260
Driveshaft
Page 19 of 759
Fig
.
16
.
Multimeter
or
Digital
Volt/Ohmmeter
(DVOM)
.
BMW
Special
Tools
FUNDAMENTALS
FOR
THE
DO-ITYOURSELF
OWNER
010-11
0012223
Some
of
the
more
challenging
repairs
covered
in
this
manual
cal¡
for
the
use
of
BMW
special
tools
.
This,
however,
does
not
automatically
mean
that
thejob
is
too
complicated
or
out
of
reach
of
thenovice
.
Many
of
the
BMW
special
tools
mentioned
in
this
manual
are
simplythe
best
thing
to
use
to
do
thejob
correctly
.
In
these
cas-
es,
the
tool
is
identified
with
a
BMW
part
number
.
See
your
au-
thorized
BMW
dealer
parts
department
for
information
on
how
to
order
special
tools
.
There
are
some
jobs
for
which
expensive
special
tools
are
essential,
and
not
a
cost-effective
purchase
for
one-time
repair
by
the
do-it-yourself
owner
.
This
manual
includes
such
repairs
for
the
benefit
of
these
with
the
necessary
experience
and
ac-
cess
to
tools
.
For
the
do-it-yourselfer,
the
need
for
special
tools
is
noted
in
the
text,
and
whether
or
not
BMW
dealer
service
is
recommended
.
EMERGENCIES
Changing
a
Tire
Stop
thecar
onas
flat
a
surface
as
possible,
in
a
place
where
you
canbe
easily
seen
by
other
drivers
.
Avoid
stopping
just
over
the
crest
of
a
hill
.
Turnon
the
emergency
flashers,
and
set
out
(lares
or
emergency
markers
well
behindthecar
.
Chock
the
wheel
(wheel
chock
located
in
trunk)
diagonally
opposite
to
the
one
being
changed
.
Passengers
shouldgetout
of
thecar
and
stand
well
away
from
the
road
.
Remove
the
spare
tire
from
the
spare
tire
storage
tray,
as
described
later
.
WARNING
-
If
a
tire
goes
fíat
while
drtving,
pull
well
off
the
road
.
Changing
a
tire
ona
busy
street
or
highway
is
very
dangerous
.
If
necessary,
drive
a
short
distance
on
the
fíat
tire
to
get
to
a
sale
place
.
tt
is
much
better
to
ruin
a
tire
or
rim
than
to
risk
being
hit
.
Take
the
jack
and
tools
from
the
tool
area
beneath
the
trunk
mat
.
Remove
the
spare
tire
from
the
tire
storage
tray
.
Loosen
the
wheel
bolts
while
the
car
is
on
the
ground,
but
leave
them
a
little
snug
.
Placethe
jack
in
the
lifting
point
nearest
the
wheel
beingchanged,
lifting
points
are
shown
in
Fig
.
1
and
Fig
.
2)
.
Use
a
board
to
provide
a
firm
footing
for
the
jack
if
the
ground
is
soft
.
Raise
the
car
only
lar
enough
so
that
the
wheel
is
fully
off
the
ground
and
then
remove
the
wheel
nuts
and
the
wheel
.
Insta¡¡
the
spare
wheel
.
Install
the
wheel
nuts
and
tighten
them
by
hand,
then
lower
the
car
.
With
all
wheelson
the
ground,
fully
tighten
the
nuts
in
a
crisscross
pattern
.
Torque
the
wheel
nuts
when
installing
the
wheel
.
Check
the
inflation
pres-
sure
of
the
spare
tire
.
Tightening
torques
"
Wheel
to
wheel
hub
.....
100
t
10
Nm
(74
t
7
ft-Ib)
Car
Will
Not
Start
If
the
engine
tucos
over
slowly
or
not
at
all,
especially
on
cold
mornings,
the
battery
may
not
be
sufficiently
charged
.
Jump-
starting
the
battery
from
another
car
may
help
.
WARNING
-
On
carswith
manual
transmisston,
push
starting
(or
tow
starting)
acar
ts
not
recommended
by
BMW
.
NOTE-
Be
sure
to
read
the
cautions
underJump
Starting
Car
prior
boosting
a
low
battery
.
Fatlure
to
followthe
cau-
tions
may
result
in
damage
to
the
electronic
compo-
nents
in
the
car
.
If
the
engine
is
turning
over
at
normal
speed
with
the
starter
motor,
the
battery
and
starter
are
fine
.
Check
to
make
sure
that
there
is
fuel
in
the
tank
.
Do
not
rely
on
the
fuel
gauge,
it
may
be
faulty
.
Instead,
remove
the
gas
filler
cap
and
rock
thecar
.
If
there
is
gas
in
the
tank,
you
should
hear
a
sloshing
sound
at
the
filler
neck
.
lf
there
is
plenty
offuel
in
the
tank,
see100
Engine-
General
for
in-depth
diagnostics
and
troubleshootingproce-
dures
.
EMERGENCIES
Page 23 of 759
020
Maintenance
Program
GENERAL
.
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020-2
BMW
Service
Indicator
......
..
....
..
...
..
.
020-2
Oil
Service
.....
.
..........
..
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...
...
..
.
020-2
Inspection
I
and
Inspection
II
.
..
....
..
...
..
.
020-2
Resetting
Service
Indicator
....
.
....
..
...
..
.
020-3
MAINTENANCE
TABLES
..
.
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........
020-3
FLUID
AND
LUBRICANT
SPECIFICATIONS
.
.
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...
020-8
Manual
Transmission
Fluid
..
.
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.
.
.
....
.
.
.
.
020-8
Automatic
Transmission
Fluid
.
.
.
.
.
....
.
.
.
.
020-8
Final
Drive
Gear
Oil
................
.
.
.
.
020-9
Brake
Fluid
.
.
.
.
.
................
.
.
.
.
020-9
Engine
Coolant
(Anti-freeze)
.
.
...
.
....
.
.
.
.
020-9
Power
Steering
Fluid
........
..
......
.
.
.
.
020-9
ENGINE
OIL
SERVICE
.
.
...
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.
...
.
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.
.
.
.
020-9
Engine
oil,
checking
leve¡
..
...
...
..
........
020-9
Engine
oil
and
filter,
changing
....
.
......
.
..
020-9
ENGINE
COMPARTMENT
MAINTENANCE
...
.
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.
.
.
.
......
020-10
Air
filter,
replacing
.
...
...
.
.....
.
.....
.
...
020-11
Spark
plugs,
replacing
...
.
......
.
...
..
...
020-11
¡dle
Speed
.
..
...
...
....
.
......
.
...
..
...
020-12
Battery,
checking
and
cleaning
.......
..
...
020-12
Battery,
replacing
.
.....
.
.....
.
.....
..
...
020-12
Accelerator
and
Throttle
Linkage
.
.....
..
...
020-13
Engine
DriveBelts
.....
.
....
..
...
...
...
.
020-13
V-belt,
replacing
(4-cylinder
engines
built
up
to
1/94)
..
....
.
020-13
Poly-ribbed
belt,
replacing
(4-cylinder
engines
built
from
1194
and
all
6-cylinder
engines)
.
.
....
..
......
020-13
Cooling
System
Service
.
...
..
....
..
....
..
020-14
Power
steering
fluid,
checking
leve¡
.
..
....
.
.
020-14
Oxygen
Sensors
....
...
..
..
....
.
.....
.
.
020-15
MAINTENANCE
PROGRAM
020-1
UNDER-CAR
MAINTENANCE
.
..
.
...
.
.
.020-16
'
Fuel
filter,
replacing
...
.
.....
..
.....
..
..
.020-16
Tires,
checking
inflation
pressure
.
.....
.
....
020-17
Tires,
rotating
...
..
.....
..
....
..
....
.
....
020-17
Wheels,
aligning
..
.....
.
...........
.
....
'020-17
Brake
system,
inspecting
.
.
....
.
.....
..
...
020-17
Brake
pad/rotor
wear,checking
.
......
.
....
020-17
Brake
fluid,
replacing
.........
..
.
..
..
.
020-17
Parking
brake,
checking
......
.
.....
..
....
020-17
Exhaust
system,
inspecting
....
..
.....
.
...
.020-18
Manual
Transmission
Senrice
..
..
.....
.
....
020-18
Manual
transmission
fluida
checking
and
filling
..
.
....
..
.
.
..
..
....
020-18
AutomaticTransmission
Service
.
....
...
....
020-18
Front
suspension
and
steeringlinkages,
inspecting
..
.
:.....
.
....
..
.....
..
...
.
.020-18
Rear
suspension,
inspecting
.
..
...
...
....
..
020-18
Final
drive
oil
leve¡,
checking
.
.
.
...
....
...
..
020-18
Fuel
tank
and
fuel
lines,
inspecting
.
.....
....
020-19
Clutch
fluid,
checking
...
...
...
...
....
.....
020-19
Drive
axle
joint
boots,
inspecting
...
..
.....
..
020-19
BODY
AND
INTERIOR
MAINTENANCE
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
...
.
.020-19
Windshield
Wiper
Blade
Maintenance
....
.
.
020-19
Body
and
hinges,
lubricating
.
.....
..
......
.
020-19
Seat
Belts
...
..
...
...
...
..
.....
..
.....
.
.
020-20
Exterior
Washing
..
...
...
..
.
.
...
..
......
.020-20
Waxing
.....
..
...
...
...
..
.....
..
.......
020-20
Polishing
..
...
...
...
....
..
..........
..
.
.'020-20
Washing
Chassis
.
...
....
.
....
..
.....
.
...
020-20
Special
Cleaning
.
.
.....
..
...
.
.....
..
..
.020-20
Interior
Care
.
....
..
....
..
..
.
.
......
.
...
020-20
Leather
Upholstery
and
Trim
...
..
....
...
...
020-20
TABLES
a
.
Oil
Service
......
...
.
..
.............
...
---
020-4
b
.
Inspection
1
Service
..
.
.
.............
....
...
020-5
c
.
Inspection
11
Service
.
.
...
...........
..
.
..
..
020-6
d
.
Scheduled
Maintenance-Time/Mileage
Intervals
..
020-7
e
.
Fluids
and
Lubricants
..
...
...........
.....
..
020-8
Page 27 of 759
Table
b
.
Inspection
I
Service
MAINTENANCE
PROGRAM
020-5
ad
d
d
ID
a
r
c
d
a~
;v
a
:
Q~
wE
y
a
r
E
R
:
L-
0
Maintenance
ítem
1
z
3
~
c
d
Engine
compartment
maintenance
Change
oil
and
oil
filter
.
Check
brake/clutch
fluid
leve¡
Check
battery
acid
leve¡
and
correct
asnecessary
.
Repair
Group
121
Check
engine
coolant
level
and
anti-freeze
protection
and
addasnecessary
.
Inspect
for
cooling
system
leaks
.
Repair
Group
170
Lubricate
throttie
linkage
Under
car
maintenance
Check
transmission
for
externa¡
leaks
.
Check
manual
transmission
oil
leve¡
andadd
asnecessary
.
Repair
Group
230
Check
final
drive
lubricant
and
addasnecessary
.
Check
fue¡
tank,
fuel
lines,
and
all
connections
for
leaks
.
Inspect
exhaust
system
.
Repair
Group
180
Check
steeringrack
and
steeringlinkages
.
Check
power
steering
system
for
leaks
.
Check
(luid
leve¡
.
Repair
Group
320
Inspect
brake
system
for
damaged
hoses
and
fines,
leaks
or
damage
.
Remove
calipers
and
check
brake
pad
wear
.
Check
brake
rotors
for
scoring
damage
.
Repair
Group
340
Check
parking
brake
operation,
adjust
cable
if
necessary
Repair
Group
340
Inspect
front
and
rear
suspension,
including
wheel
bearings,
for
play
.
Repair
Group
320/330
Inspect
wheelsand
tires,
including
spare,
check
tire
pressure
and
condition
Body
and
Interior
Maintenance
Lubricate
door
hinges
and
hood
latch,
hood
hinges
Check
headlight
and
driving
light
aiming
and
adjust
as
necessary
.
Check
operation
of
headlights,
parking
lights,
back-up
fights,
licenseplate
lights,
interior
lights,
glove
box
light,
engine
compartment
light,
trunk
light,
instrument
panel
lights,
turnsignals,
emer-gency
flashers,
stop
fights,
horas,
headlight
flasher
and
dimmer
switch
Replace
ventilation/A/C
micro-filter
.
Check
functionof
air
conditioning
.
Repair
Group
640
Check
function
of
seat
belts
.
Repair
Group
720
Check
tightness
of
mountfng
screws
on
airbag
front
crash
sensors
(Airbag
I)
.
Repair
Group
721
Check
windshield
washer
fluid
leve¡
and
concentration,
add
as
necessary
Check
operation
of
washer
system
.
Check
condition
of
wiperblades
.
Repair
Group
611
Tighten
nuts
and
bolts
for
door
locks
and
striker
plates
Replace
batteries
for
alarm/remote
control
in
masterkey(where
applicable)
.
Road
Test
Check
braking
performance,
steering,
HVAC,
manual
or
automatic
transmission,
and
mirrors
Service
Interval
Reset
Reset
service
indicator
using
specialreset
tool
.
MAINTENANCE
TALES
Page 28 of 759
020-6
MAINTENANCE
PROGRAM
Group
310/330
Table
c
.
Inspection
II
Service
a
d
d
a
a>
0
d
a
r
.c
mm
L
m
y
L
E
ó
3
E
ó
Maintenance
ítem
l
o-
z
~
c
Engine
compartment
maintenance
Inspect
V-belt
/Poly-ribbeddrive
condition
.
Check
V-belt
tension,
if
applicable
.
Lubricate
throttle
linkage
.
Replace
air
filter
.
Change
oil
and
oil
filter
.
Replacespark
plugs
.
Repair
Group
120
Check
brake/clutch
fluid
leve¡
.
Check
battery
acid
leve¡
and
correct
asnecessary
.
Repair
Group
121
Check
engine
coolant
leve¡
and
anti-freeze
protection
and
add
asnecessary
.
Inspect
for
cooling
system
leaks
.
Repair
Group
170
Under
car
maintenance
Change
automatic
transmission
fluid
.
Repair
Group
240
Change
manual
transmission
oil
.
Repair
Group
230
Check
clutch
plate
for
wear
.
Repair
Group
210
Check
drive
axle
boots
for
leaks
.
Repair
Group
330
Change
final
drive
fluid
(1995
and
later
models
:
change
synthetic
oil
every
2nd
Inspection
II)
.
Replace
fuel
filter
.
Check
fuel
tank,
fuel
lines,
and
af
connections
for
leaks
.
Inspect
exhaust
system
.
Repair
Group
180
Check
steering
gear
and
steering
¡inkages
.
Check
power
steering
system
for
leaks
.
Check
fluidleve¡
.
Repair
Group
320
Inspect
brake
system
for
damaged
hoses
and
lines,
leaks
or
damage
.
Remove
calipers
and
check
brake
pad
wear
.
Check
brake
rotors
for
scoring
damage
.
Repair
Group
340
Check
parking
brake
operation,
adjust
cable
if
necessary
.
Check
thickness
of
parking
brake
lin-
ings
.
Repair
Group
340
Inspect
front
and
rear
suspension,
including
front
and
rear
wheel
bearings,
for
play
.
Repair
Inspect
wheels
and
tires,
including
spare,
check
tire
pressure
and
condition
.
Body
and
Interior
Maintenance
Lubricate
door
hinges
and
hood
latch,
hood
hinges
.
Check
headlight
and
driving
light
aiming
and
adjust
asnecessary
.
Check
operation
of
headlights,
parking
lights,
back-up
lights,
licenseplate
lights,
interior
lights,
glove
box
light,
engine
compartment
light,
trunk
light,
instrument
panel
lights,
turn
signals,
emer-gency
flashers,
stop
lights,
horns,
headlight
flasher
anddimmer
switch
.
Check
active
check
control
panel
forfauits
(where
applicable)
.
6
Electrical
System
MAINTENANCE
TABLES
Continued
on
next
page
Page 37 of 759
Fig
.
18
.
Fill
mark
on
coolant
expansion
tank
.
Coolant
level
should
be
at
mark
when
engine
ís
cold
.
.
..
e
..
.-
..
~
..
.-
.
Ozone
Damaged
Hose
0012476
Fig
.
19
.
Examples
of
damage
to
coolant
hoses
.
Any
of
conditions
shown
is
cause
for
replacement
.
Courtesy
of
Gates
Rubber
Company,
Inc
.
Specification
"
Power
steering
fluid
..........
.
...
Dexron
III®ATF
Oxygen
Sensors
1996
and
later
engines
are
equipped
withmultiple
oxygen
sensors
.
See
Fig
.
21
.
A
regulating
sensor
is
mounted
before
each
catalytic
converter
and
amonitoring
sensor
downstream
of
each
converter
.
The
regulating
sensor
monitors
engine
com-
bustion
efficiency
and
helps
to
control
the
fuel
injection
system
and
exhaust
emissions
.
The
monitoring
sensor
is
usedby
the
On-board
diagnostic
system
to
monitor
the
function
of
the
cata-
lytic
converter
.
MAINTENANCE
PROGRAM
020-
1
5
NOTE-
5pecialsockets
for
replacingthe
oxygen
sensor
are
available
from
most
automotive
parts
stores
.
The
sock-
et
has
agroove
cut
down
one
side
to
allow
the
sensor
to
be
installed
without
damaging
the
wire
hamess
.
Fig
.
20
.
Power
steering
fluid
dipstick
showing
MIN
and
MAX
marks
.
OBD
II
enhanced
emission
standards
require
the
engine
control
module
(ECM)
to
monitor
the
oxygen
content
in
theex-
haust
bothbefore
and
after
the
catalytic
converter
.
This
allows
for
tightercontrol
of
the
tail
pipe
emissions
and
also
allowsthe
ECM
to
diagnose
converter
problems
.
lf
the
DME
detects
that
catalytic
converter
or
oxygen
sensor
efficiency
has
degraded
past
a
certain
pre-programmed
limit,
it
will
turn
on
the
Check
Engine
light,
and
store
a
diagnostic
trouble
code
(DTC)
in
the
ECM
.
Replacement
of
oxygen
sensors
at
the
specified
intervals
en-
sures
that
the
engine
and
emission
control
system
wíll
continue
to
operate
as
designed
.
Extending
the
replacement
interval
may
void
the
emission
control
warranty
coverage
.
See
180
Ex-
haust
System
for
information
on
replacing
the
oxygen
sen-
sors
.
Tightening
Torque
"
Oxygen
sensor
to
exhaust
system
........
.
.
.
..
55±5
Nm
(40±4
ft-Ib)
ENGINE
COMPARTMENT
MAINTENANCE
Page 41 of 759
NOTE-
Use
a14
mm
or17
mm
alíen
bit
socket
to
remove
the
drain
plug
.
"
If
thecar
is
raised
in
the
air,
it
shouldbe
leve¡
.
Fuel
tank
and
fuel
fines,
inspecting
0012474
Inspect
the
fuel
tank,
fuel
lines,
and
fuel
system
for
damage
or
leaks
.
Check
for
fuel
leaks
in
the
engine
compartment
or
fuel
odors
in
the
passenger
compartment
.
Check
for
faultyfuel
lines
bybending
them
.
If
any
leaks
are
present,
fuel
should
be
expelled
.
Check
for
any
evaporative
emissions
hoses
that
may
have
become
disconnected,
checking
carefully
at
the
charcoal
canister
and
evaporative
emissionspurge
system
.
See130
Fuel
Injection
and
160
Fuel
Tank
and
Fuel
Pump
for
component
locations
and
additional
information
.
WARNING
-
When
checking
for
fuel
leaks,
the
engine
must
be
cold
.
A
hot
exhaust
manifold
or
exhaust
system
could
cause
the
fuel
to
ignite
or
explode
causing
se-
rious
personal
injury
.
Uentilate
the
workarea
and
clean
up
spilled
fuel
immediately
.
Clutch
fluid,
checking
The
hydraulic
clutch
and
the
brake
system
share
the
same
reservoir
and
the
same
brake
fluid
.
Clutch
fluid
leve¡
and
brake
fluid
level
are
checked
at
the
same
time
.
See340
Brakes
for
more
information
.
See210
Clutch
for
information
on
the
clutch
and
the
hydraulic
clutch
operating
system
.
MAINTENANCE
PROGRAM
020-19
Drive
axie
joint
boots,
inspecting
100
Engine-General
The
protective
boots
must
be
closely
inspected
for
cracks
andany
other
damage
that
will
allow
contaminants
to
get
ínto
the
joint
.
If
the
rubber
boots
faf
,
the
water
and
dirt
that
enter
the
joint
will
quickly
damage
¡t
.
Replacement
of
the
drive
axle
joint
boots
and
inspection
of
the
joints
are
described
in
330
Rear
Suspension
.
BODY
AND
INTERIOR
MAINTENANCE
Windshield
Wiper
Biade
Maintenance
Common
problems
with
the
windshield
wipers
include
streaking
or
sheeting,
water
drops
after
wiping,
and
blade
chat-
ter
.
Streaking
is
usually
caused
when
wiper
blades
are
coated
with
road
film
or
car
wash
wax
.
Clean
the
blades
using
soapy
water
.
If
cleaning
theblades
does
not
cure
the
problem
then
they
should
be
replaced
.
BMW
recommends
replacing
the
wip-
er
blades
twice
a
year,
before
and
after
the
cold
season
.
Onold-
er
cars,
check
the
tension
spring
that
holds
the
wiper
to
the
glass
.
Replace
the
wiper
arm
if
the
springs
are
weak
.
Drops
that
remainbehind
after
wipingare
caused
by
oil,
road
film,
or
diesel
exhaust
coating
the
windshield
.
Use
an
alcohol
or
ammonia
solution,
or
a
non-abrasive
cleanser
to
clean
the
windshield
.
Wiper
blade
chatter
may
be
caused
by
dirty
or
worn
blades,
bya
dirty
windshield,
or
by
bentor
twisted
wiper
arms
.
Clean
the
blades
and
windshield
as
described
above
.
Adjust
the
wiper
arm
so
that
there
is
even
pressure
along
the
blade,
and
so
that
the
blade
is
perpendicular
to
the
windshield
atrest
.
Lubricate
the
wiper
linkage
with
a
light
oil
.
The
linkage
is
located
under
the
hood
on
the
drivers
side
.
If
the
problem
persists,
theblades
are
excessively
aged
or
worn
and
should
be
replaced
.
See
611
Wipers
and
Washers
.
Body
and
hinges,
lubricating
The
door
locks
and
lock
cylinders
canbe
lubricated
with
an
oil
that
contains
graphite
.
The
body
and
door
hinges,
the
hood
latch,
and
the
door
check
rods
should
be
lubricated
with
SAE
30
or
SAE
40
engine
oil
.
Lubricate
the
seat
runners
with
multipurpose
grease
.
Do
not
apply
any
oil
to
rubber
parts
.
If
door
weatherstrips
are
sticking,
lubricate
them
with
silicone
spray
or
talcum
powder
.
The
hood
release
cable
should
be
lubricated
as
well
.
The
use
of
winter
lock
de-icer
spraysshould
be
kept
to
an
ab-
solute
minimum,
as
the
alcohol
in
the
de-icer
will
wash
the
grease
out
of
the
lock
assemblies,
and
may
cause
the
locks
to
corrode
internally,
or
become
difficult
to
operate
.
ENGINE-GENERAL
100-1
Page 46 of 759
100-4
ENGINE-GENERAL
'
TEMP
PRECAT
POST
CAT
OXYGENSENSOR
HEATING
#
.
THROTTLE
POSITION
FUEL
INJECTOR
CONTROL
(SEQUENTIAL)
OPERATING
POWER
00
CAMSHAFT
POSITION
SENSOR
ECM
I
MAIN
GROUND
RELAY
J_
-
AC
COMPRESSOR
RELAY
CONTROL
TERMINAL
15
MEMORY
POWER
FUEL
PUMP
RELAY
CONTROL
AUX
GROUND
P
CRANKSHAFT
POSITION
dESENSOR
INTAKE
AIR
ENGINE
COOLANT
TEMP
FUEL
TANK
PRESSURE
SENSOR
S-EML
S-MSR
ASC
S-ASC
VEHICLE
SPEED
LOW
FUEL
LEVEL
A/C
SWITCH
ON
(AC)
E36
IHKA
COMPRESSOR"ON"
SIGNAL
(KO)
INDIVIDUAL
SERIAL
NUMBER
MS41
.1
SECONDARY
AIR
1NJECTION
AIR
PUMP®
RELAY
CONTROL
IDLE
CONTROL
VALVE
'M
FUEL
INJECTION
(TI)
ENGINE
SPEED
(TD)
Fig
.
5
.
Siemens
MS
41
.1
OBD
II
engine
management
systemusedon
1996
and
later
M52
engines
.
GENERAL
IGNITION
COILS
CONTROL
L
r"Q
if~
CIYVFIYC
CHE
AMP
CONTROL
ENGINE
THROTTLE
POSITION
6
ECM
RELAY
CONTROL
ASC
THROTTLE
..
:
.
.
..
-11
1Q\\\
POTENTIOMETER
POWER
CAN
TCM
II
SCAN
(DES
;
ER
DIAGNOSIS
OBD
II
I
II
GENERIC
SCANTOOL
0012596
Page 47 of 759
ignition
Table
b
.
Engine
Management
Systems
engine
has
high
mileage
.
Engine
1
System
4-cylinder
engines
M42
(1992-1995)
Bosch
DME
Ml
.7
M44
(1996-1998)
Bosch
DME
M5
.2
(OBD
II)
6-cylinder
engines
M50
(1992)
Bosch
DME
M3
.1
M50
VANOS
(1993-1995)
Bosch
DME
M3
.3
.1
M52
(1996-1998)
Siemens
MS41
.1
(OBD
II)
S50US
(1995)
Bosch
DME
M3
.3
.1
S52US
(1996-1998)
Siemens
MS41
.1
(OBD
II)
Both
the
4-cylinder
and
6-cylinder
engines
use
a
distributor-
less
ignition
system
with
individual
ignition
coils
for
each
cylin-
der
.
FuelDelivery
Pressurized
fuel
from
the
in-tank
fuel
pump
is
injected
via
solenoid-type
fuel
injectors
.
The
ECM
controls
the
opening
and
closing
of
the
injectors
by
switchingthe
ground
side
of
each
injector
circuit
.
The
exact
amount
of
fuel
injected
is
de-
termined
by
the
amount
of
timethe
injectors
are
open
.
Cooling
System
Whenever
the
engine
is
running,
acoolant
pump
circulates
coolant
through
the
engine
and,
if
either
heater
control
valves
are
open,
through
the
heater
core
in
the
passenger
compart-
ment
.
The
coolant
absorbs
excess
heat
and
carries
it
to
the
ra-
diator
where
it
is
transferred
into
the
passing
airstream
.
A
thermostat
controls
the
flow
of
coolant
through
the
radiator
based
on
engine
temperature
.
Lubrication
System
The
lubrication
system
is
pressurized
whenever
theengine
is
running
.
The
oil
pump
draws
oil
through
a
pickup
in
the
bot-
tom
of
the
oil
pan,thenforces
it
through
a
replaceable
oil
filter
and
finto
the
engine
oíi
passages
.
On
4-cylinder
engines,
the
oil
pump
is
mounted
to
the
front
engine
cover
.
On
6-cylinder
engines,thechain-driven
oil
pump
is
bolted
to
the
bottom
of
the
cylinder
block
.
A
pressure
relief
valve
limits
the
maximum
system
pres-
sure
.
A
bypass
valve
prevents
the
oil
filter
from
bursting
and
insures
engine
lubrication
should
the
filter
become
plugged
.
See
119
Lubrication
System
for
additional
information
.
ENGINE-GENERAL
100-
5
Various
versions
of
DME
systems
are
usedon
thecars
cov-
MECHANICAL
TROUBLESHOOTING
ered
by
this
manual
.
See
Table
b
.
Each
system
is
highly
adaptive
to
compensate
for
things
suchasengine
wear
and
When
troubleshooting
an
engine
that
fails
to
start
or
runs
vacuum
leaks
.
poorly,
first
check
its
mechanical
condition-particularly
if
the
Warnings
and
Cautions
For
personal
safety,
as
well
asthe
protection
of
sensitive
electronic
components,
the
following
warnings
and
cautions
must
be
adhered
to
during
all
troubleshooting,
maintenance,
and
repairwork
.
WARNING
-
"
The
ignition
system
produces
high
voltages
that
can
be
fatal
.
Avoid
contact
with
exposed
termi-
nals
anduse
extreme
caution
when
working
on
a
car
with
the
ignition
switched
on
or
the
engine
running
.
"
Do
not
touch
or
disconnect
any
high
voltage
ca-
bles
from
the
coil,
distributor,
orspark
plugs
while
the
engine
is
running
or
being
cranked
by
the
starter
"
Connect
and
disconnect
the
engine
manage-
ment
system
wiring
and
test
equipment
leads
only
when
the
ignition
is
switched
off
.
"
Gasoline
is
highly
flammable
and
its
vapors
are
explosive
.
Do
not
smoke
or
work
on
a
car
near
heaters
or
other
fire
hazards
when
diagnosing
and
repairing
fuel
system
problems
.
Have
a
fire
extínguisher
available
in
case
of
an
emergency
.
"
Disconnecting
the
battery
may
erase
fault
code(s)
stored
in
control
module
memory
.
Using
special
BMW
diagnosnnc
equipment,
check
for
fault
codes
prior
to
disconnecting
the
battery
cables
.
If
the
Check
Engine
lightis
illuminated,
see
On-
Board
Diagnostics
(OBD)
forfault
code
infor-
mation
.
If
any
other
system
faults
havebeen
de-tected
(indicated
byan
illuminated
warning
light),
see
an
authorized
BMW
dealer
.
CAUTION-
"
Prior
to
disconnecting
the
battery,
read
the
bat-
tery
disconnection
cautions
gíven
at
the
front
of
this
manual
on
page
viii
.
"
Do
notconnect
any
test
equipment
that
delivers
a
12-volt
power
supply
to
terminal15
(+)
of
the
ignition
coil
.
The
current
flow
may
damage
the
ECM
.
In
general,
connect
test
equipment
only
as
specified
by
BMW,
this
manual,
or
the
equip-
ment
maker
.
"
Do
not
disconnect
the
battery
with
the
engine
running
.
Do
notrunthe
engine
with
any
of
the
sparkplug
wires
disconnected
.
MECHANICAL
TROUBLESHOOTING
Page 50 of 759
100-8
ENGINE-GENERAL
Symptom
1
Probable
cause
and
correctiveaction
1
.
Engine
will
not
start
or
run
.
Starter
cranks
a
.
No
fuel
reaching
engine
.
Check
forfuelin
tank
.
engine
at
normal
speed
.
Fuel
pump
notoperating
.
Repair
Group
160
b
.
No
spark
.
Check
ignition
system
.
Repair
Group
120
c
.
Incorrect
valve
timing
.
Check
timing
chain
.
Repair
Group
117
2
.
Check
Engine
warning
light
illuminated
.
a
.
DME
engine
management
system
self-diagnostic
fault
detected
.
Sea
an
authorized
BMW
dealer
or
other
qualified
shop
for
OBD
II
fault
code
diagnosis
.
See
also
On-
board
Diagnostics(OBD),
given
later
inthis
repair
group
.
3
.
White
exhaust
smoke
(steam)
.
a
.
Failed
cylinder
head
gasket
(probably
accompanied
bylowcompression
readings)
.
Replace
gasket
and
resurface
cylinder
head
if
necessary
.
Repair
Group
113
4
.
Blue-gray
exhaust
smoke
and
oily
spark
a
.
Contaminated
or
gasoline-diluted
engine
oil
.
Change
engine
oil
and
replace
oil
filter
.
plugs
.
Indicates
oii
burning
in
combustion
.
Repair
Group
020
b
.
Faulty
valve
guide
seals
or
valve
guides
.
Replace
valve
guide
oil
seals
or
overhaul
cylinder
head
.
Repair
Group
116
5
.
Pinging
or
rattling
when
under
load,
a
.
Ignition
timing
too
advanced
.
Ignition
knocksensors
faulty
(CheckEngine
light
traveling
uphill,
or
accelerating,
especially
illuminated)
.
Repair
Group
120fromlow
speeds
.
Indicates
pre-ignition
or
b
.
Fuel
octane
leve¡
toolow
.
detonation
.
c
.
Engine
running
too
hot
or
overheating
.
Check
cooling
system
.
Repair
Group
170
6
.
Light
metallic
tapping
that
varies
directly
with
engine
speed
.
Oil
pressure
warning
light
not
illuminated
.
7
.
Light
metallic
knock
that
varies
directly
with
enginespeed
.
Oil
pressure
warning
light
blinking
or
fully
illuminated
;
may
be
most
noticeable
during
hard
stops
or
cornering
.
8
.
Screeching
or
squealing
under
load
that
a
.
Loose,worn,
or
damaged
drive
belt
.
Inspect
belt(s)
.
Repair
Group
020
goesaway
when
coasting
.
9
.
Growling
or
rumbling
that
varieswith
engine
a
.
Remove
drive
belt(s)toidentifyfaulty
component
.
Check
for
play,
bearing
roughness,
rpm
.
Indicates
abad
bearing
or
bushing
in
and
loose
mountings
.
Refer
to
appropriate
repair
group
for
repair
procedures
.
an
engine-driven
accessory
.
DRIVEABILITY
TROUBLESHOOTING
On-Board
Diagnostics
(OBD)
On-Board
Diagnostics
is
incorporated
into
al¡
engine
man-
Two
generations
of
OBD
are
usedon
thecars
covered
by
agement
systems
used
on
the
cars
covered
by
this
manual
.
this
manual
:
Therefore,
checking
for
fault
codes
should
be
the
first
step
in
troubleshootinga
driveability
problem
.
For
additional
informa-
On-Board
Diagnostics
tion
on
engine
management
and
repair
see130
Fuel
Injec-
tion
.
"
1992-1995models
....
.
..
....
.
..
.......
OBD
I
"
1996-1998models
.
....
..
.
.
.
..
.
........
OBD
II
DRIVEABILITY
TROUBLESHOOTING
Tablec
.
Engine
Mechanical
Troubleshooting
b
.
Warped
or
cracked
cylinder
head
.
Resurface
or
replace
cylinder
head
.
Repair
Group
113
c
.
Cracked
cylinder
block
.
Replace
engine
or
short
block
.
c
.
Worn
piston
rings
.
Overhaul
or
replace
engine
.
d
.
Failed
cylinder
head
gasket
.
Replace
gasket
.
Repair
Group
113
d
.
Air/fuel
mixture
too
lean
(Check
Engine
light
illuminated)
.
Repair
Group
130
a
.
Valveclearances
excessive
.
Check
hydraulic
valve
adjusters
.
Repair
Group
116
b
.
Low
oil
pressure
orpossibly
defective
warning
light
circuit
.
Check
oil
pressure
andwarning
light
circuit
.
Repair
Group
119
c
.
Dirty
oil
.
Change
oil
.
Repair
Group
020
.
a
.
Low
oil
leve¡
.
Check
and
correct
oil
leve¡
.
b
.
Low
oil
pressure/worn
or
faulty
oil
pump
.
Oil
pump
pickup
restricted/clogged
.
Check
oil
pressure
.
Repair
Group
119
The
OBD
system
detects
emissions-related
engine
manage-
ment
malfunctions
and
tucos
on
the
Check
Engíne
lightin
the
in-
strument
cluster
.
TheCheck
Engine
light
will
stay
on
until
the
code(s)are
called
up
and
the
memory
is
erased
.
When
faulty
are
detected,
the
OBD
system
stores
a
Diagnostic
Trouble
Code
(DTC)
in
the
system
ECM
.
In
addition,
the
Check
Engine
warn-
ing
light
will
come
on
if
an
emissions-related
fault
is
detected
.