1995 BMW M3 cylinder head tighten
[x] Cancel search: cylinder head tightenPage 131 of 759
Camshaft
position
(CMP)
sensor,
replacing
(6-cylinder
engine)
1
.
Remove
plastic
cover
from
above
fuel
injectors
.
2
.
Disconnect
harness
connector
from
VANOS
solenoid
and
unscrew
solenoid
from
VANOS
control
unit
.
Re-
"
Clean
contactsurface
on
engine
block
before
fnstall
move
oil
supply
line
from
VANOS
control
unit
.
See
117
ing
knock
sensors
.
Camshaft
Timing
Chain
.
3
.
Remove
camshaft
position
(CMP)
sensor
from
left
frontof
cylinder
head,
next
to
top
of
oil
filter
housing
.
"
Knock
sensor
to
cylinder
block
....
20
Nm
(15
ft
.
lbs
.)
4
.
Disconnect
CMP
sensor
harnessfrom
under
intake
manifold
.
5
.
Installation
is
reverse
of
removal
.
Use
a
new
O-ring
when
installing
sensor
.
Be
sure
wiring
is
rerouted
in
same
orientation
.
Tightening
Torques
"
CMP
sensor
to
cylinder
head
....
.
.
..
5
Nm
(3
.5
ft-Ib)
"
VANOS
oil
supply
pipe
to
VANOS
control
unit
...........
.
..
32
Nm
(24
ft-Ib)
"
VANOS
solenoid
to
VANOS
control
unit
...
.
.................
30
Nm
(22
ft-Ib)
Knock
sensors,
replacing
Knock
sensors
are
usedon
engines
with
Bosch
DME
M1
.7,
Bosch
DME
M3
.3
.1,
Bosch
DME
M5
.2,
and
Siemens
MS
41
.1
engine
management
systems
.
The
knocksensors
are
bolted
to
the
left
sideof
the
cylinder
block
and
monitor
the
combus-
tion
chamber
for
engine-damaging
knock
.
If
engine
knock
is
detected,
the
ignition
point
is
retarded
accordingly
via
the
en-
gine
control
module
.
CA
UTION-
"
Label
knock
sensorharness
connectors
before
disconnecting
them
.
The
connectors
must
not
be
interchanged
.
Engine
damage
may
result
if
the
sensors
are
monitoring
the
wrong
cytinders
.
"
Note
the
installed
angle
of
the
knock
sensoron
the
block
before
removing
it
.
Reinstall
the
sensor
in
the
same
position
.
Be
sure
to
usea
torque
wrench
when
tightening
the
sensormounting
bola
NOTE
-
"
On
M52
engines,
a
single
harness
connects
the
twosensors
to
the
main
harness
connector
.
The
shorter
cable
lead
fs
for
the
knock
sensor
for
cytinders
4,
5,
and
6
.
Tightening
Torque
IGNITION
SYSTEM
120-
7
0012730
Fig
.
12
.
Knock
sensor
mounting
bolt
on
front
left
side
of
cylinder
block
.
NOTE-
Knock
sensor
function
Is
monitoredby
the
On-Board
Diagnostic
system
.
If
a
knock
sensor
is
detected
to
be
faulty,
an
appropriatediagnostic
trouble
code
(DTC)
may
be
stored
in
memory
.
See
100
Engine-General
for
information
on
retrieving
DTCs
.
On
6-cylinder
engines,
the
knock
sensors
are
accessible
af-
ter
removing
the
intake
manifold
.
On
4-cylinder
engines,
the
upper
section
of
the
intake
manifold
should
be
removed
to
ac-
cess
the
sensors
.
See
Fig
.
12
.
NOTE-
Intakemanifold
removal
and
installation
procedures
are
"
Cylinder
no
.
1is
at
the
front
of
the
engine
.
covered
in
113
Cylinder
HeadRemoval
and
Installation
.
Ignition
Firing
Order
Ignition
Firing
Order
"
4-cylinder
engines
.....
..
...
.
..........
.1-3-4-2
"
6-cylinder
engines
...........
..
.
.
..
..
1-5-3-6-2-4
IGNITION
SYSTEM
SCHEMATICS
Fig
.
13
through
Fig
.
17
show
ignition
system
schematics
usedon
the
enginescoveredby
this
manual
.
IGNITION
SYSTEM
SCHEMATICS
Page 146 of 759
121-1
O
BATTERY,
STARTER,
ALTERNATOR
9
.
Remove
starter
from
above
.
10
.
Check
starter
pinion
gear
and
flywheel
teeth
for
dam-
age
.
11
.
Installation
is
reverse
of
removal
.
Tightening
Torques
"
tntakemanifold
to
cylinder
head
M7
nut
...
.
................
...
.
15
Nm
(11
ft-Ib)
M8
nut/bolt
.............
.
.
..
...
22
Nm
(16
ft-Ib)
"
Starter
to
engine
block
(M10
bolt)
...
50
Nm
(37
ft-Ib)
"
Support
bracket
to
starter
(M5
nut)
...
5
Nm
(44
in-lb)
"
Support
bracket
to
engine
block
(M10
bolt)
.
.
..
..
...
47
Nm
(35
ft-Ib)
"
Wire
toterminal
50
(M6
nut)
.
..
.....
6
Nm
(53
in-lb)
"
Wire
toterminal
30
(M8
nut)
...
.....
12
Nm
(9
ft-Ib)
Solenoid
switch,
removing
and
installing
1
.
Remove
starter
as
described
above
.
Tightening
Torque
2
.
Remove
cover
from
solenoid
switch
.
"
Field
winding
strap
to
starter
(M8)
...
.
12
Nm
(9
ft-Ib)
3
.
Disconnect
fieid
winding
strap
between
starter
motor
and
solenoid
switch
.
NOTE-
The
condition
of
the
field
winding
strap
is
critical
.
If
it
is
damaged,
bumed
or
partially
melted
through,
a
new
or
rebuilt
starter
motor
is
needed
.
4
.
Remove
solenoidswitch
mounting
screws,
and
sepa-
,
rate
solenoid
from
starter
.
See
Fig
.
12
.
CAUTION-
When
installing
fieid
winding
strap
to
starter,
posi-
tion
it
so
that
it
does
not
contact
the
starter
body
.
STARTER
SERVICE
131~184
Fig
.
12
.
Starter
solenoid
mounting
screws
(arrows)
are
tight
.
Use
en
impact
screwdriver
to
loosen
the
screws
.
5
.
Installation
is
reverse
of
removal
.
Lubricate
solenoid
pistos
with
light
grease
.
Page 159 of 759
6
.
Remove
fuel
rail
mounting
bolts
.
See
Fig
.
17
.
0012504
Fig
.
17
.
Location
of
fuel
rail
mounting
bolts
(A)
and
fuel
inlet
and
return
lines
(B)
on
M44
engine
.
Upper
manifold
has
been
removed
.
7
.
Pull
upon
fuel
rail
and
remove
injector
rail
with
injec-tors
.
Remove
individualinjectors
by
removing
injector
retaining
clip
and
pullinginjector
from
rail
.
See
Fig
.
18
.
Fig
.
18
.
Pry
retaining
clip
from
injector
(1),
then
pull
injector
from
rail
(2)
.
8
.
Installation
is
reverse
of
removal
.
Tightening
Torque
"
Fuel
rail
to
cylinder
head
..
.
..
..
...
10
Nm
(89
in-lb)
FUEL
INJECTION
130-
1
3
Fuel
Pressure
Regulator
The
fuel
pressure
regulator
location
on
E36
models
is
mounted
in
one
of
two
locations
:
Fuel
Pressure
Regulator
Location
"
4-cylinder
engines
1992-
January
1997
............
...
..
on
fuel
rail
January
1997-
on
...............
..
...
under
car
"
6-cylinderengines
1992-1995
.
.
...
...
.
...........
...
..
on
fuel
rail
1996-on
..
.
..
................
...
...
undercar
Fuel
pressure
regulator,
replacing
(fuel
rail
mount)
WARNING
-
Fuel
will
be
discharged
.
Do
not
disconnect
any
wires
that
could
cause
electrícal
sparks
.
Do
not
smoke
or
work
near
heaters
or
other
fire
hazards
.
Keepan
approved
fire
extinguisher
handy
.
9
.
On
6-cylinder
engines,
remove
top
engine
covers
.
Re-
move
fuel
rail
mounting
bolts
and
lift
up
fuel
rail
.
1
.
Disconnect
vacuum
hose
from
fuel
pressure
regulator
.
See
Fig
.
19
.
"
Fit
new
O-rings
when
installing
injectors
.
For
ease
of
installation,
lightly
lubricate
O-rings
with
SAE
90
or
0012732
equivalent
lubricant
.
Fig
.
19
.
Fuel
pressure
regulator
(arrow)
on
M42
engine
.
Vacuum
hose
"
Check
that
injector
electrical
connections
are
correctly
shown
at
A
.
fitted
and
that
injectors
are
fully
seated
prior
to
install-
ing
fuel
rail
mounting
bolts
.
2
.
Remove
bolt
from
regulator
clamp
.
Remove
clamp
.
Note
"
Replace
wire
ties
.
installed
direction
of
regulator
to
fuel
rail
.
3
.
Wrap
a
shop
rag
around
regulator,
then
remove
regula-
tor
from
fuel
rail
by
pulling
straight
out
.
FUELDELIVERYTESTS
Page 161 of 759
u0
I
.[
Ia
Fig
.
21
.
Air
flow
sensor
harness
connector
terminal
identification
.
4
.
Replacing
air
flow
sensor
:
"
Remove
large
band
clamp
attaching
air
boot
to
sensor
.
"
Remove
airfiltertop
cover,
then
remove
airflow
sensor
mounting
nuts
inside
cover
.
"
Reconnect
air
boot
and
harness
connector
.
Engine
coolant
temperature
(ECT)
sensor,
testing
and
replacing
The
engine
coolant
temperature
(ECT)
sensor
sends
con-
tinuous
engine
coolant
temperature
information
to
the
ECM
.
As
temperature
increases,
sensor
resistance
decreases
.
"
With
harness
connector
disconnected,
check
resis-
tance
across
sensor
terminals
.
"
Compare
tests
results
to
values
in
Table
d
.
FUEL
INJECTION
130-
1
5
0011984
Fig
.
22
.
M42
engine
coolant
temperature
(ECG
sensor
(arrow)
.
Table
d
.
Engine
Coolant
Temperature
Sensoror
Intake
Air
TemperatureSensor
Test
Values
(DME
1
.7)
Test
temperatures
Resistance
(k
ohms)
',
14±2°F(-10t1°C)
7-11
.6
68±2°F
(20
t
1
°C)
2
.1
-2
.9
176
±
2°F
(80
t
V
C)
0
.27-0
.40
The
ECT
sensor
is
located
under
number
one
intake
run-
'
ner
.
See
Fig
.
22
.
NOTE-
1
.
Check
ECM
referente
voltage
to
sensor
:
The
test
values
listed
represent
only
three
test
points
from
a
continuous
resistance
NTC
sensor
.
Check
the
"
Disconnect
harness
connectorfrom
ECT
sensor
.
full
linear
response
to
increasing
temperature
as
the
"
Turn
ignition
key
on
.
engine
warms
up
.
"
Check
for
5
volts
between
supply
voltage
(brown/red)
wire
of
harness
connector
and
ground
.
3
.
If
ECT
sensor
fails
these
tests,
it
is
faulty
and
should
be
"
Turn
ignition
key
off
.
replaced
.
If
no
faults
are
found,
reconnect
electrical
"
If
voltage
is
not
present
or
incorrect,
check
wring
from
harness
.
ECM
and
check
ECT
sensor
reference
voltage
output
at
ECM
.
See
Table
h
.
NOTE-
2
.
Check
ECT
sensor
resistance
:
Use
a
new
copper
sealing
washer
when
installing
sen-
sor
.
Reptace
any
lost
coolant
.
WARNING
-
Do
not
replace
the
ECT
sensor
unlessthe
engine
is
cold
.
Hot
coolant
can
scald
.
Tightening
Torque
"
ECT
sensor
to
cylinder
head
.....
..
13
Nm
(10
ft-Ib)
BOSCH
DME
M1
.7
COMPONENT
TESTS
AND
REPAIRS
Page 165 of 759
Table
f
.
Engine
Coolant
TemperatureSensor
or
Intake
Air
TemperatureSensor
Test
Values
(DME
3
.113
.3
.1)
Test
temperatures
Resistance
(k
ohms)
14±
2°F
(-10
±
1'C)
7-11
.6
68±
2°F
(20
±
1'C)
2
.1
-2
.9
17612°F
(80
t
V
C)
0
.27-0
.40
NOTE
The
test
values
listed
represent
only
three
test
points
from
a
continuous
resistance
NTC
sensor
.
Check
the
full
linear
response
to
increasing
temperatures
as
the
engine
warms
up
.
3
.
If
ECT
sensor
fails
these
tests,
it
is
faulty
and
should
be
replaced
.
If
no
faults
are
found,
reconnect
electrical
harness
.
WARNING
-
Do
not
replace
the
ECT
sensor
unless
the
engine
is
cold
.
Hot
coolant
can
scald
.
NOTE-
Use
"
a
new
copper
sealing
washer
when
installing
sensor
.
Replace
any
lost
coolant
.
Tightening
Torque
"
Engine
coolant
temperature
sensor
to
cylinder
head
.........
..
.
..
...
13
Nm
(10
ft-lb)
Intake
air
temperature
(IAT)
sensor,
testing
and
replacing
The
intake
air
temperature
(IAT)
sensor
signal
is
usedasa
correction
factor
for
fuel
injection
and
ignition
timing
.
Thissen-
sor
is
mounted
in
the
intake
manifold
behind
the
throttle
posi-
tion
switch
.
See
Fig
.
28
.
Check
TPS
function
by
disconnecting
theharnessconnec-
1
.
Check
that
ECM
reference
voltage
is
reaching
IAT
sen-
tor
and
testing
continuity
across
the
terminalswhile
changing
sor
:
the
throttle
position
.
Resistance
test
values
are
listed
below
.
If
"
Disconnect
IAT
sensor
harness
connector
.
the
resuits
are
incorrect,
replace
the
throttle
position
sensor
.
"
Turn
ignition
keyon
.
See
Fig
.
29
.
"
Check
for
5
volts
between
supply
voltage
wire
of
har-
ness
connector
and
ground
.
NOTE-
"
Turn
ignition
key
off
.
The
throttle
position
sensor
is
not
adjustable
.
If
test
re-
sults
are
incorrect,
the
sensor
should
be
replaced
.
IAT
Sensor
Supply
Voltage
"
M50/S50US
engines
.
........
grey
wire
and
ground
FUEL
INJECTION
130-19
Fig
.
28
.
Intake
air
temperature
sensor
location
on
M50/S50US
engine
(arrow)
.
If
voltage
is
not
present
or
incorrect,
check
wiring
from
ECM
and
check
reference
voltage
signal
at
ECM
(pin
77)
.
See
Ta-
ble
i
or
Table
j
.
2
.
Check
IAT
sensor
resistance
:
"
With
harness
connector
disconnected,
check
resis-
tance
acrosssensor
terminals
.
Compare
tests
resuits
to
values
in
Table
f
given
earlier
.
"
If
IAT
sensor
fafs
thistest
it
is
faulty
and
should
be
re-
placed
.
3
.
If
no
faults
are
found,
reconnect
electrical
harness
.
Throttle
position
sensor
(TPS),
testing
and
replacing
The
throttle
position
sensor
(TPS)
is
mounted
on
the
side
of
the
throttle
housing
and
is
directly
connected
to
the
throttle
valve
shaft
.
The
ECM
sends
a
voltage
signal
to
the
potentiom-
eter-type
sensor
and
monitors
the
voltage
that
comes
back
.
BOSCH
DME
M3
.
1
AND
M32
.1
COMPONENT
TESTS
AND
REPAIRS
Page 167 of 759
NOTE-
NOTE-
"
The
Ole
speed
control
valve
signal
can
be
checked
The
intake
manifold
is
held
in
place
with
7
nuts
from
using
a
duty
cycle
meter
(or
dwellmeter)
.
Connect
the
above
and
2
support
bracket
bolts
from
undemeath
.
On
meter
to
the
valve
following
the
manufacturer's
in-
DME
3
.1
cars,
carefully
disconnect
the
idleair
hose
from
structions
.
Turn
on
the
WC
or
create
a
larga
air
leak
theintake
manifold
when
lifting
the
manifold
off
.
For
more
and
check
that
the
meter
reading
reacts
while
the
idle
information,
sea
113
Cylinder
HeadRemovaland
In-
speed
remainssteady
.
stallation
.
"
There
are
some
additional
inputs
to
the
control
mod-
ule
that
affect
idle
speed
(Le
.
throttle
position,
AIC-on
5
.
Disconnect
al¡
necessary
hoses
andremove
idle
speed
signals,
andAIT
Drive
position)
.
Check
these
signals
control
valve
.
if
idle
problems
persist
.
See
Tabla
i
orTable
j
.
Idle
speed
control
valva,
replacing
The
idle
speed
control
valve
is
mounted
beneath
the
intake
manifold
.
Accessing
the
valva
is
best
accomplishedby
first
re-
moving
the
intake
manifold
.
NOTE-
¡tis
recommended
that
the
intake
manifold
gaskets
be
replaced
whenever
the
intake
manifold
is
removed
.
1
.
Remove
top
enginecovers
from
engine
.
See
Fig
.
31
.
FUEL
INJECTION
130-21
6
.
Installation
is
reverse
of
Removal
.
Use
new
gaskets
when
installing
intake
manifold
.
NOTE-
Poor
driveability
may
be
noticed
afterinstalling
a
re-
placement
idle
speed
control
valve
.
After
about
10
min-
utes
of
driving,
the
system
will
adapt
the
base
setting
of
the
valva
and
the
idle
speed
should
retum
to
normal
.
Tightening
Torque
"
Intakemanifold
to
cylinder
head
(M7)
........
..
.
15±2
Nm
(11
ti
ft-Ib)
BOSCH
DME
M5
.2
COMPONENT
REPLACEMENT
On-Board
Diagnostics
11
(OBD
II)
is
incorporated
into
the
Bosch
DME
M5
.2
engine
management
systems
used
on
the
M44
engine
.
OBD
II
is
capable
of
detecting
a
full
range
of
faults
.
When
faults
are
detected,
a
Diagnostic
Trouble
Code
(DTC)
is
stored
in
the
system
ECM
.
The
Check
Engine
warn-
ing
light
will
also
come
on
if
an
emissions-relatad
fault
is
de-
tected
.
The
most
efficient
way
to
diagnose
the
Bosch
OBD
II
sys-
tem
is
by
using
a
specialized
scan
tool
.
The
OBD
II
system
is
capable
of
storing
hundreds
of
faults,
making
diagnostics
with
a
scan
tool
the
only
viable
method
.
Therefore,
system
diag-
nostics
is
not
covered
here
.
Fi
31
.
Remove
to
en
ine
covers
b
in
out
caPs
and
removin
NOTE-
nuts
(A)
9
.
P
g
y
Pry
g
g
"
The
OBD
11
fault
memory
(including
an
iiluminated
Note
14
L-te
at
cover
edge
(arrows)
.
Check
Engine
light)
can
only
be
reset
using
the
spe-
cial
scan
tool
.
Removing
the
connector
from
the
ECM
2
.
Remove
two
hold
down
nuts
from
fuel
injector
wiring
or
disconnecting
the
battery
will
not
arase
the
fault
duct
.
Pry
back
injector
connector
retainers
and
lift
off
memory
.
wiring
duct
.
"
The
16-pin
OBD
Il
diagnostic
connector
is
located
on
the
lower
left
dash
panel
.
Refer
to
Fig
.
1
.
3
.
Disconnect
intake
air
bootfrom
throttle
housing
.
Where
applicable
disconnect
accelerator
cable
and
cruise
"
BMW
special
scan
tool
ora
`generic"OBD
II
scan
tool
control
cable
from
their
brackets
.
must
be
used
to
access
DTCs
.
4
.
Unbolt
intake
manifold
and
move
it
out
of
way
enough
to
access
idle
speed
control
valva
.
"
Tablak
lists
engine
control
module
(ECM)
pinouts
for
the
DMEM5
.2
system
BOSCH
DME
M5
.
2
COMPONENT
REPLACEMENT
Page 168 of 759
130-
2
2
FUEL
INJECTION
Mass
air
flow
sensor,
replacing
1
.
Disconnect
harness
connector
and
intake
air
bootfrom
air
flow
sensor
.
See
Fig
.
32
.
Fig
.
32
.
To
detach
air
flow
sensor,
disconnect
harness
connector
(A)
;
3
.
Installation
is
reverse
of
removal
.
unclip
retainíng
clips
to
aír
filter
housing
(B)
;
andremove
large
hose
clamp
at
air
intake
bellows
(C)
.
M44
engine
with
traction
"
Use
a
new
copper
sealing
washer
when
installing
sen-
control
shown
.
sor
.
"
Replace
any
lost
coolant
.
2
.
Detachtwo
large
clipsat
air
filter
housing
and
work
air
flow
sensor
out
of
rubber
seal
in
filter
housing
.
Tightening
Torque
3
.
Installation
is
reverse
of
removal
.
"
Engine
coolant
temperature
"
For
ease
of
installation,
lubricate
large
rubber
seal
in
to
cylinder
head
.............
.
..
.
13
Nm
(10
ft-Ib)
air
filter
housing
with
silicone
lubricant
or
equivalent
.
"
No
adjustment
to
air
flow
sensor
is
possible
.
"
Carefully
check
that
all
hoses
and
seals
are
seated
Intake
air
temperature
(IAT)
sensor,
properly
.
replacing
Engine
coolant
temperature
(ECT)
sensor,
replacing
The
engine
coolant
temperature
(ECT)sensor
is
a
dual
temperature
sensor
.
One
circuít
provides
coolant
temperature
information
to
the
ECM
while
the
other
circuít
provides
coolant
temperature
information
to
the
instrument
cluster
.
WARNING
-
Do
not
replace
the
ECT
sensor
unless
the
engine
is
cold
.
Hot
coolant
can
scald
.
1
.
Disconnect
harness
connector
from
ECT
sensor
.
See
Fig
.
33
.
2
.
Unscrew
temperature
sensorfrom
cylinder
head
and
remove
BOSCH
DME
M5
.2
COMPONENT
REPLACEMENT
U1111
bis4a
Fig
.
33
.
M44
engine
coolant
temperature
(ECT)
sensor
located
above
oil
filter
(arrow)
.
The
intake
air
temperature
(IAT)
sensoron
cars
with
M44
engine
is
mounted
in
thetop
section
of
the
intake
air
filter
housing
.
See
Fig
.
34
.
1
.
Remove
electrical
harness
connector
from
IAT
sensor
.
2
.
Unclip
temperature
sensor
and
remove
from
air
filter
housing
.
3
.
Installation
is
reverse
of
removal
.
Throttle
position
sensor
(TPS),
replacing
The
throttle
position
sensor
is
located
on
the
side
of
the
throttle
housing
.
See
Fig
.
35
.
1
.
Unplug
harness
connector
from
sensor
.
Page 171 of 759
Mass
air
flow
sensor,
replacing
1
.
Disconnect
harness
connector
and
intake
air
boots
from
air
flow
sensor
.
See
Fig
.
37
.
Fig
.
37
.
Mass
air
flow
sensor
(arrow)
on
M52
engine
.
2
.
Installation
is
reverse
of
removal
.
"
No
adjustment
to
aír
flow
sensor
is
possible
.
"
Check
intake
hoses
for
cracks
and
vacuum
leaks
.
Engine
coolant
temperature(ECT)
sensor,
replacing
The
ECT
sensor
is
a
dual
temperature
sensor
.
One
circuit
provides
coolant
temperature
information
to
the
ECM
while
the
other
circuit
provides
coolant
temperature
information
to
the
instrument
cluster
.
1
.
Remove
left-side
top
engine
cover
.
4
.
Remove
sensor
.
5
.
Installation
is
reverse
of
removal
.
"
Replace
any
lost
coolant
.
0012703
"
Use
a
new
copper
sealing
washer
when
installing
new
Tightening
Torque
"
Engine
coolant
temperature
to
cylinder
head
.....
..
.
...
......
13
Nm
(10
ft-Ib)
FUEL
INJECTION
130-
25
0012704b
Fig
.
38
.
M52
engine
:
Engine
coolant
temperature
(ECT)
sensor
(A)
is
located
beneath
top
engine
cover
(8)
and
crankcase
vent
hose
(C)
.
Intake
air
temperature
(IAT)
sensor,
replacing
The
intake
air
temperature
(IAT)
sensor
for
the
M52/S52US
engine
is
mounted
on
the
bottom
of
the
intake
manifold
.
See
Fig
.
39
.
2
.
Unclip
crankcase
venting
hose
from
cylinder
head
cov-
er
.
See
Fig
.
38
.
Fig
.
39
.
M52/S52US
engine
:
Intake
air
temperaturesensor
location
in
bottom
of
intake
manifold(arrow)
.
Throttle
housing
shown
re
3
.
Under
intake
manifold,
disconnect
harness
connector
moved
.
fromsensor
.
1
.
Disconnect
intake
air
bootfrom
throttle
housing
.
Unbolt
throttle
housing
and
¡ay
aside
.
(It
is
not
necessary
to
disconnect
throttle
cable
or
electrical
harnessconnec-
tors
from
throttle
housing
.)
sensor
.
2
.
Remove
electrical
harness
connector
from
IAT
sensor
.
3
.
Unclip
temperature
sensor
and
remove
from
intake
manifold
.
4
.
Installation
is
reverse
of
removal
.
Use
a
new
gasket
at
the
throttle
housing
.
SIEMENS
MS
41
.1
COMPONENT
REPLACEMENT