1998 BMW 740I engine

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RepairsIndexOverview Controls Car care Technology Data
Electronic vehicle immobilizerThe key to securityYour BMW is equipped with a passive
anti–theft system. This electronic immo-
bilization system is designed to reduce
the susceptibility of your vehicle to theft
by making it impossible to start the en-
gine using any means other than the
special keys furnished with the vehicle.
Your BMW center can cancel the elec-
tronic system authorization for individ-
ual keys (for instance, in the event of
loss). A deactivated key can no longer
be used to start the engine.390de015
How the electronics workAt the heart of this system is an elec-
tronic chip which is integrated into the
key. The lock mechanism itself is actu-
ally a dual-function device, simulta-
neously serving as a communications
interface designed to allow the security
system to maintain a continuous stream
of variable, vehicle-specific signals with
the electronic circuitry in the key. The
system will not release the ignition, fuel
injection and starter unless it recog-
nizes an "authorized" key.
Force applied to the key can dam-
age the integrated electronic cir-
cuitry. A damaged key can no longer be
used to start the engine.<

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Sliding/Tilt sunroof
To prevent injuries, exercise care
when closing the sliding/tilt sun-
roof and keep it in your field of vision
until it is shut.
Before leaving the car, switch off the
electric sunroof mechanism by taking
out the ignition key. Do not leave
children unattended in the vehicle with
access to vehicle keys. Use of the key
can result in starting of the engine and
operation of vehicle systems such as
power sunroof, etc. Unsupervised use
of these systems can result in serious
personal injury.<
To avoid pressure or drafts in the pas-
senger compartment when the sunroof
is open or lifted, keep the air vents in
the dashboard open and increase
the air supply if necessary. Refer to
pages 100, 104.
For the convenience operating mode
via the door lock or the radio remote
control, refer to page 32 or page 33.
Safety featureIf the sliding/tilt sunroof encounters re-
sistance at a point roughly past the
middle of its travel when it is closing,
the closing cycle is interrupted and the
sunroof will open again slightly.
Despite this safety feature, be ex-
tremely careful that the closing
path of the sunroof is not obstructed
whenever it is closed. Otherwise, trig-
gering the closing-force limitation may
not be ensured in some situations (with
very thin objects, for instance). You can
override this safety feature by pressing
the switch beyond the resistance point
and holding it.<
Lifting – opening – closingFrom ignition key position 1 press the
switch or slide it to the desired direction
until you feel resistance.
When lifting, the headliner retracts sev-
eral inches.
You can continue to operate the sun-
roof after the ignition has been
switched off as long as one of the front
doors has not been opened.380de615

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RepairsIndexOverview Controls Car care Technology Data
Steering/Ignition lock Starting engine0 Steering lock engagedThis is the only position in which the ig-
nition key can be inserted and removed.
An acoustic warning sounds when you
fail to remove the ignition key before
opening the driver's door.
After removing the key, turn the steer-
ing wheel slightly to the left or right until
you hear the lock engage.380de010
Your vehicle is equipped with an inter-
lock. For this reason, the ignition key
cannot be turned to position 0 and re-
moved until the selector lever is in posi-
tion P.
In addition, the selector lever is locked
in position P when the ignition key is in
position 0 or removed from the ignition
switch.
To move the selector lever out of P, the
ignition key must be turned at least to
position 2.1 Steering lock disengagedYou will find that it is often easier to turn
the ignition key from position 0 to posi-
tion 1 when you move the steering
wheel slightly to help disengage the
lock.
Individual electrical equipment and ac-
cessories are available for use.2 Ignition onAll electrical equipment and accesso-
ries are available for use.3 Starting engineBefore starting
>Press the parking brake pedal
>Place the selector lever of the auto-
matic transmission in P or N.
Do not allow the engine to run in
enclosed spaces. The exhaust
gases contain carbon monoxide, an
odorless and colorless, but highly toxic
gas. Breathing the exhaust gases poses
an extreme health risk, and can lead to
unconsciousness and death.
Never leave the car unattended with the
engine running, as such a vehicle repre-
sents a potential safety hazard.< Starting engine>Start the engine. Do not press the ac-
celerator pedal.
Your BMW is equipped with the
convenience starting feature.
Simply turn the key to position 3 (starter)
and then release it immediately.
The starter continues to operate auto-
matically until the engine starts.

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Starting engine Switching off engineIf the battery's voltage is not adequate,
the automatic starting procedure is not
initiated, or it is interrupted. Should this
condition arise, it remains possible to
jump-start the engine (refer to page 17 9).
Do not allow the engine to warm up by
leaving it running while the vehicle re-
mains stationary. Instead, begin driving
immediately at a moderate engine
speed.<
Should the engine fail to start on the
first attempt (if it is very hot or cold, for
instance):
>Press the accelerator pedal halfway
down while engaging the starter.
BMW 740i/L:
Cold starts at extremely low tempera-
tures, from approx. +57 (–156)
and at elevations above 3300 feet
(1000 meters):
>Press the accelerator pedal halfway
down while engaging the starter.Engine idle speed is controlled by the
engine computer system. Increased
speeds at start-up are normal and
should decrease as the engine warms
up. If engine speed does not decrease,
service is required.
To prevent the battery from discharg-
ing, always switch off any electrical de-
vices not in use, as well as the ignition
when the vehicle is not being driven.Turn the ignition key to position 1 or 0.
The vehicle must be stationary
and the selector lever in "Park"
before you can remove the ignition key.
Always remove the ignition key and en-
gage the steering lock before leaving
the vehicle.<

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Automatic transmissionSelector lever positions
P R N D 4 3 2
Shift programsLever positions:
>A (Adaptive/Economy)
>M (Manual)
Selector lever in position 4:
>S (Sport program)
For an explanation of the programs, re-
fer to the next page.Starting engineThe engine can only be started in posi-
tions "Park" or "Neutral."380us045
Changing the selector lever
positionA detent prevents inadvertent shifts into
some selector lever positions. To re-
lease the shift-lock mechanism, press
the button on the front side of the se-
lector handle (arrow).
While the vehicle is stationary and
before shifting out of "Park" or
"Neutral," depress the footbrake in or-
der to disengage the selector lever's
lock mechanism (shift-lock).
Hold the footbrake down until starting
off. The vehicle will otherwise "creep"
when a drive position is engaged.< 380us046
Before exiting the vehicle when
the engine is running, place the
selector lever in the "Park" or "Neutral"
position and apply the parking brake. If
you do not, the vehicle can move.
Do not leave the car unattended with
the engine running.
An unattended vehicle with a running
engine represents a potential safety
hazard.<
P - ParkSelect "Park" only when the vehicle is
stationary. The transmission locks to
prevent the rear wheels from turning.R - ReverseSelect "Reverse" only when the vehicle
is stationary.N - NeutralSelect "Neutral" only if your journey is
interrupted for a longer period.D - Drive
(automatic shift program)This position is designed for driving un-
der all normal operating conditions. All
forward gears are available; the Adap-
tive Transmission Control (ATC) is fully
operational.

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Automatic transmissionSpecial functionsIn program A, the Adaptive Transmis-
sion Control influences several special
functions in the selection of the drive
gear.
With the system active, some shifts that
would be made in other modes will be
suppressed. The system also reacts to
special situations by executing shifts
that would not occur with a conven-
tional transmission.Control of the winter programA winter program is automatically se-
lected when the vehicle is operated on
slippery road surfaces (snow and ice).
When this program is active, the trans-
mission starts in 2nd gear and shifts
into the higher gears earlier. This pro-
gram improves response under winter
driving conditions by providing en-
hanced traction and vehicle stability.
ATC leaves the winter program when it
registers a high-traction road surface,
when the Sport program is selected and
when ASC+T/DSC is deactivated.
Electronic transmission control
moduleIf the message "TRANS. FAILSAFE
PROG" appears in the Check Control,
there is a fault in the gearshift electronic
system or in the transmission itself.
You can still place the selector lever in
all positions. However, it is possible
that not all gears are available for the
vehicle's forward drive.
If this happens, avoid extreme engine
loads and consult the nearest autho-
rized BMW center.
Do not work in the engine com-
partment when a drive gear (for-
ward or reverse) is engaged. If you do
this, the vehicle could move.<
For towing, tow-starting or jump-start-
ing the vehicle, refer to pages 179, 180.

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RepairsIndexOverview Controls Car care Technology Data
Automatic transmission with Steptronic
*
You may drive your vehicle as with a
typical automatic transmission, but you
may also shift manually.
When you move the selector lever to
the left from position "D" and into the
M/S shift level, the performance-ori-
ented shift programs of the automatic
transmission are activate. As soon as
you move the selector lever in the "+" or
"–" direction, Steptronic changes the
gear and the manual mode is active. If
you wish to utilize automatic shifting
once again, move the selector lever to
the right and into the D position.
The automatic transmission of your
BMW is equipped with an Adaptive
Transmission Control (ATC). This sys-
tem reacts with precision to your indi-
vidual driving style and the current driv-
ing conditions. Different shift programs
are utilized to achieve this.
For details concerning ATC, please re-
fer to the chapter describing "Advanced
technology" on page 184.
Selector lever positions
P R N D M/S + –
Starting engineThe engine can only be started in selec-
tor lever positions P ("Park") or N ("Neu-
tral").380us667
Range selectionA detent prevents inadvertent shifts into
some selector lever positions. To re-
lease the shift-lock mechanism, press
the button on the front side of the se-
lector handle (arrow).
While the vehicle is stationary and
before shifting out of "Park" or
"Neutral," depress the footbrake in or-
der to disengage the selector lever's
lock mechanism (shift-lock).
Hold the footbrake down until starting
off. The vehicle will otherwise "creep"
when a drive position is engaged.< 380de211

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Automatic transmission with Steptronic
*
Before exiting the vehicle when
the engine is running, place the
selector lever in the "Park" or "Neutral"
position and apply the parking brake. If
you do not, the vehicle can move.
Do not leave the car unattended with
the engine running. An unattended ve-
hicle with a running engine represents a
potential safety hazard.<
P - ParkSelect "Park" only when the vehicle is
stationary. The transmission locks to
prevent the rear wheels from turning.R - ReverseSelect "Reverse" only when the vehicle
is stationary.N - NeutralSelect "Neutral" only if your journey is
interrupted for a longer period.D - Drive
(automatic shift program)This position is designed for driving un-
der all normal operating conditions. All
forward gears are available; the Adap-
tive Transmission Control (ATC) is fully
operational."Kickdown" (automatic downshift)In the "Kickdown" mode, you achieve
maximum performance.
Press the accelerator pedal past the in-
creased resistance point at the full-
throttle position.
M/S - Manual mode and
Sport ProgramWhen you change from "D" to M/S, the
Sport program is activated. This is indi-
cated by "D S" in the gear display. This
position is recommended if your driving
style is performance-oriented.
With the first brief touch, the automatic
transmission shifts from the Sport pro-
gram to manual mode.
When you move the selector lever for-
ward in the "+" direction, the transmis-
sion shifts up. When moved back in the
"–" direction, the transmission shifts
down.
Depending on the version, "1 to 5" or
"M1 to M5" appears in the gear display.380de659