BMW 3 (E46). Manual — part 14
Similarly, turn main engine drive
belt tensioner lug (B) clockwise
and remove belt.
WARNING!
Observe care when replacing belts.
Personal injury could result if a
tensioner springs back into position
uncontrollably.
CAUTION!
Mark drive belt rotation direction if
removing and reusing an old belt.
-
When installing a new belt, gently
pry it over the pulleys. Too much
force may damage the belt or the
accessory.
Idle speed
Engine idle speed can change due to a
number of factors, including normal
wear. The idle speed in E46 models is
electronically adaptive and
non-adjustable. See
130 Fuel
Injection
for more information.
Oxygen sensors
The engine management system in
E46 models is equipped with multiple
oxygen sensors. A regulating sensor is
mounted before each catalytic
converter and a monitoring sensor
downstream of each converter. The
regulating sensor monitors engine
combustion efficiency and helps to
control the fuel injection system and
exhaust emissions. The monitoring
sensor is used by the on-board
diagnostic (OBD II) system to monitor
the function of the catalytic converter.
OBD II enhanced emission standards
require the engine control module
(ECM) to monitor the oxygen content in
the exhaust both before and after the
catalytic converter. This allows for
tighter control of the tail pipe emissions
and also allows the ECM to diagnose
converter problems. If the ECM 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. See
OBD On Board
Diagnostics
in the rear of this manual
for more information on OBD systems.
Replacement of oxygen sensors at the
specified intervals ensures that the
engine and emission control system
will continue to operate as designed.
Extending the replacement interval
may void the emission control warranty
coverage. See
180 Exhaust System
for information on replacing the oxygen
sensors.
Tightening torque
Oxygen sensor to
exhaust manifold
50 Nm (37 ft-lb)
Note:
A special socket for replacing the
oxygen sensor is available from most
automotive parts stores. The socket
has a groove cut down one side to allow
the sensor to be installed without
damaging the wire harness.
Power steering fluid, checking
level
To check power steering fluid level in
fluid reservoir:
Park car on level ground with
engine off.
Level is correct if it is between MIN
and MAX marks on dipstick.
If level is below MIN mark, start
engine and add fluid to reservoir
to bring level up.
Stop engine and recheck level.
Hand-tighten reservoir cap.
Power steering fluid
Recommended fluid Dexron III® ATF
Spark plugs, replacing
E46 engines use a "coil-over"
configuration, with one ignition coil
above each spark plug.
Remove microfilter housing:
Remove microfilter for interior
ventilation. See
Ventilation
microfilter, replacing
Open wiring harness loom (A),
remove harness and lay aside.
Unfasten screws (B) and take off
lower microfilter housing.
Remove engine cover over ignition
coils:
Remove oil filler cap.
Remove plastic trim covers
(arrows).
Remove cover hold down bolts.
Remove ignition coil grounding
harnesses (arrows).
Remove ignition coils:
Pull up on spring clips to
disconnect ignition coil harness
connectors.
Remove coil mounting bolts.
Remove coils.
-
Remove spark plugs.
-
Installation is reverse of removal,
bearing in mind the following:
Lightly lubricate new spark plug
threads with copper-based
anti-seize compound.
Thread plugs into cylinder head
by hand to prevent cross-
threading.
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