1998 BMW 528i asc cable

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110-3
Engine Removal and lnstallationl
Q Fuel line plugs
(Tool No.
BMW 13 5 281 / 13 5 282)
4 Fuel line removal tool
(Tool No.
BMW 16 1 050)
CAUTION-
Disconnecting the battery may erase fault code@) storedin
memoiy Check for fault codes prior to disconnecting the
battery cables.
If the MIL (Malfunction Indicator Light, also may be
called "Check Engine" or "Service Engine Soon" light)
is illuminated, see
OBD On-Board Diagnostics for
DME fault code information.
It orhersysrem faults have been detected, as indicated I
by an ~llum~nated ABS, SRS orASC/DSC ~arning light,
see the appropriate repair group in this manual or an
authorized BMW dealer for more information on fault
codes.
NOTE- Engine removal procedures are similar for all 6-cylinder
models. When differences
exist, they are noted at the be-
ginning of each step. Engine are referred to by engine
code. See
100 Engine-General for engine code and appli-
cation information.
@ Be sure to cover all painted surfaces before beginning the
removal procedure. As an aid to installation, label all com-
ponents, wires and hoses before removing them. Do not
reuse
gaskets, O-rings or seals during reassembly.
The
intake manifold must be removed on &cylinder mod-
els before the engine can be removed.
WARNING-
Due to risk of personal injury, be sure the engine is cold be-
fore beginning the removal procedure.

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Engine Removal and lnstallationl
< Remove positive battery cable and intake manifold cover:
Remove protective cover from positive (+)jump start post
(4.
Loosen and remove battery lead mounting nut.
Remove lead and push down through intake manifold
Remove trim covers
(arrows) from fuel injector cover.
Remove cover hold down bolts and lift off cover.
Working above engine, disconnect the following:
Vent line from cylinder head cover (A).
M52 engine: Oxygen sensor connectors (8).
Electrical harness connector from intalte camshaft VANOS
solenoid valve
(C).
M52 engine: Disconnect electrical harness connectors at
throttle valve position switch
(D), ASC valve position switch
(E), fuel injector harness (F) and vent valve (G).
CAUTION-
Be sure to mark oxygen sensor harness connectors so that
they can be reassembled correctly Do not interchange con-
nectors.
4 M52 TU, M54 engine: Disconnect fuel injector electrical con-
nectors from injectors.
Use small screwdriverto pry one corner of wire lock clip on
fuel injector
1 connector.
Repeat for all injectors.
Lifl off connector loom and lay aside.

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Engine Removal and lnstallationl
NOTE-
BMW uses three styles of fuel line connections; a one-time
single use clamp, a locking fitting that uses special tool
16 1
050 to release, and a quick release sleeve (arrow) that dis-
connects the line when depressed.
WARNING-
Fuel may be expelled under pressure. Do not smoke or work
near heaters or other fire hazards. Keep a fire extinguisher
handy Before disconnecting fuel hoses, wrap a cloth around
fuel hoses to absorb any leaking fuel. Plug all
oDen fuel lines.
< M52 engine: Remove throttle valve and ASC throttle
assemblies.
Disconnect ASC throttle cable
(A).
Remove ASC throttle housing mounting fasteners (El).
Clamp off, disconnect, and plug coolant hoses (C).
Disconnect throttle and cruise control cables (D).
Remove throttle housing mounting hardware and throttle
valve.
NOTE-
M52 TU, M54 engine: Throttle body is removed with intake
manifold.
< M52 TU engine: Pull throttle cable out of rubber retainer (A)
and unloclc ball end of cable (6) from throttle actuator.

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110-19
Engine Removal and Installation
M62 engine, remove ASC throttle body.
Disconnect electrical harness from throttle position sensor.
- Disconnect ASC actuator cable (arrow).
. Remove mounting fasteners and remove throttle body.
On front of left side cylinder head, disconnect electrical har-
ness connector
(A), and remove and plug fuel tank vent valve
vacuum line
(0).
Raise car and support in a safe manner.
CAUTION-
Male sure the car is stable and well supported at aN times.
Use a professional automotive
lifi orjackstands designed for
I the ouroose. A floor jack is not adequate support.
Working beneath car:
- Remove engine splash shield.
Remove right and left heat shield from front suspension
subframe.
Working underneath engine compartment, disconnect
ground cable on right side engine mount
(arrow).

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113-10
Cylinder Head Removal and Installation
4 Working above engine, disconnect the following:
Vent line from cylinder head cover
(A).
. Oxygen sensor connectors (B).
Electrical harness connector from VANOS solenoid
valve
(C).
Electrical harness connectors at throttle valve position
switch
(D), ASC valve position switch (E), fuel injector har-
ness
(F) and vent valve (G).
CAUTION-
Be sure to mark oxygen sensor harness connectors so that
they can be reassembled correctly Do not interchange con-
nectors.
4 Where applicable, remove schraeder valve cap (arrow) from
air connection on fuel rail. Using a tire chuck, blow fuel back
through feed line using a brief burst of compressed air (max-
imum of
3 bar or 43.5 psi).
WARNING-
. Fuel in fuel line is underpressure (approx. 3 - 5 bar or 45 -
75 psi) and may be expelled. Do not smoke or work near
heaters or other fire hazards. Keep a fire extinguisher
handy Before disconnecting fuel hoses, wrap a cloth
around fuel hoses to absorb any leaking fuel. Catch and
dispose of escaped fuel. Plug open fuel lines.
- Always unscrew the fuel rank cap ro release pressure
;n the tank before working on the tank or lines.
Disconnect fuel lines by sliding locking collar in (arrows) and
pulling lines apart.
NOTE-
BMW uses three styles of fuel line connections; a one-time
use
clamp; a locking fitting that uses BMWspecial tool 16 1
050 to release; and a quick release sleeve (above) that dis-
connects the line when depressed.

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..
Cylinder Head Removal and Installation 1
< Remove intake throttle valve and ASC throttle assemblies:
Disconnect ASC throttle cable
(A).
- Remove ASC throttle housing mounting fasteners (B).
NOTE-
It is not necessary to disconnect coolant hoses (C) 01
bowden cables (D).
Remove intake throttle housing mounting hardware, pull
throttle housing off
intake manifold, and set aside.
- Working under intake manifold, disconnect the following:
Engine oil dipstick tube support.
Oil separator return line from dipstick tube.
Intake air temperature sensor electrical harness connector
(underside of intake manifold near throttle body).
* Fuel tank vent line and electrical harness at canister vent
valve.
Remove lower intake manifold supports (arrows).
- Disconnect coolant line retaining bracket at cylinder block.
4 Remove manifold mounting hardware (arrows).
- Remove intake manifold from cylinder head while carefully
checking for electrical connections or hoses.
NOTE-
Fuel rail is removed with intake manifold,
CAUTIOI\C
Stuff clean rags into open intake ports to prevent any parts
from falling into
Nie engine intake.
- Drain cooling system (engine block and radiator), then re-
move radiator cooling fan and fan shroud. See
170 Radiator
and Cooling System.
- Disconnect coolant hoses from thermostat housing.

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Camshaft Timing chain1
< Remove Automatic Stability Control (ASC) throttle body:
Disconnect electrical harness from throttle position sensor.
Disconnect ASC actuator cable (arrow).
Remove
3 mounting fasteners and remove throttle body.
4 Disconnect fuel tank vent valve line and cap off line (arrow).
- Drain engine coolant and remove hoses from thermostat
housing. See
170 Radiator and Cooling System.
- Remove water pump and thermostat housing. See 170 Ra-
diator and Cooling System.
- Remove left side upper timing chain cover retaining bolts and
remove cover.
4 Counter hold right intake camshaft
CAUTION-
Counter hold camshaft with a 27mm open-end wrench while
loosening sprocket bolts. Grind wrench if necessary to pre-
vent damage to head.

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Fuel Injection
4 Remove electrical harness connector (arrow) from IAT sen-
sor.
CAUTION-
Be sure the ignition switch is in the off position before repiac-
ins the intake temperature sensor.
- Depress loclting clip on side of temperature sensor and pull
straight out of intake manifold.
- Installation is reverse of removal
- Use a new sealing O-ring at base of sensor and lubricate with
assembly lubricant for
ease of installation
MS 42.0 throttle valve assembly, replacing
< The motor driven throttle valve for the MS 42.0 system is re-
- ferred to as MDK (motor driven throttle valve). The MDK unit
is electronically operated to regulate intake air flow by the
ECM.
The
MS 42.0 system uses a throttle cable from the accelera-
tor pedal to the MDK unit. The throttle cable is connected di-
rectly to the integral pedal position sensor
(PWG) in the MDK
unit. This sensor communicates pedal position to the ECM,
which in turn electronically regulates throttle plate position.
The MDK pulley is linked to the throttle shaft by springs to al-
low ASC intervention to override the driver's pedal position.
NO TE -
The MDIC unit is non-adjustable and must be replaced as
a complete unit if found to be faulty.
if replacing the
MDK unit, the adaptation values stored in
the ECM must be clearedand the new unit initialized using
BMW special service tools.
CAUTION-
If the adaptation process is not completed correct& the en-
gine wiii
not start.
- Disconnect battery negative (-) cable in luggage compart-
ment.
CAUTION-
Prior to disconnecting the battern read the battely discon-
nection cautions in
001 General Warnings and Cautions.