2004 JAGUAR XJ engine

On the Road 4 - 65
Fuel capacity
Avoid the risk of running out of fuel and never intentionally
drive the car when the fuel gauge indicates that the tank is
empty. When refuelling your vehicle after the fuel gauge reads
empty, you may not be able to add the fuel quantity shown
below to the tank as there will be a small reserve remaining in
the tank.Fuel Economy
The following tips not only lead to greater fuel economy but also
reduce air pollution causing less environmental damage:
• Try to avoid using the car for short journeys – this will lead
to greater fuel economy and reduce wear on the engine.
• Plan ahead – choose uncongested routes, combine car trips and share cars where possible.
• Drive off as soon as possible after starting a cold engine – do not leave the engine idling until it has warmed up.
• Drive smoothly and efficiently – harsh acceleration and heavy braking have a significant effect on fuel
consumption – driving more smoothly saves fuel.
• Slow down – driving at high speeds significantly increases fuel consumption.
• Switch off – sitting stationary is zero miles per gallon, switch
off the engine when it is safe to do so.
• Unnecessary weight – do not carry unnecessary weight and remove roof-racks when not in use.
• Regular servicing keeps the engine at best efficiency.
• Ensure that tyres are inflated to the correct pressure for the journey.
• Use air conditioning and all vehicle electrical devices sparingly – all increase fuel consumption.
• Check your fuel consumption – it will help you get the most from your car and any significant change in consumption
may indicate a vehicle fault.
Normally
Aspirated
Supercharged
Tank capacity 22.4 US gallons
85 litres 22.3 US gallons
84.5 litres
Fill capacity (when fuel
gauge indicates empty) 20.9 US gallons
79 litres20.3 US gallons
77 litres
Reserve capacity (when fuel
gauge indicates empty) 1.5 US gallons
5.8 litres2.0 US gallons
7.5 litres

4-66 On the Road
Fuel filler flap manual release
If the fuel filler flap fails to release it can
be manually unlocked as follows:
1. In the luggage compartment, remove
the carpet from the right-hand side,
behind the rear light. To do this, turn
the carpet securing screws a ¼ turn
and then firmly pull the top corner of
the carpet down.
2. Locate the fuel flap release mechanism and pull the knob rearwards. This will
release the flap to gain access to the
filler cap and enable the vehicle to be
refuelled.
3. Report the fault to a Jaguar Retailer. Unleaded fuel
All vehicles are fitted with a catalytic
system and can only use unleaded fuel.
Unleaded fuel must be used for the
emission control system to operate
properly. Its use will also reduce spark
plug fouling, exhaust system corrosion
and engine oil deterioration.
The preferred fuel should have an octane
rating of at least 95 RON (Research
Octane Number).
‘Super Green’ Plus 98 RON unleaded fuel
(where available) may be used as an
alternative to the standard 95 RON
unleaded fuel. Some countries have only 91 RON fuel
available. The vehicles in these countries
are specially calibrated to use this fuel.
Using unleaded fuel with an octane rating
lower than recomm
ended can cause
persistent, heavy ‘spark knock’ (a metallic
rapping noise). If severe, this can lead to
engine damage.
If a heavy ‘spark knock’ is detected even
when using fuel of the recommended
octane rating, or if you hear steady ‘spark
knock’ while holding a steady speed on
level roads consult a Jaguar Retailer to
have the problem corrected. Failure to do
so is misuse of the vehicle, for which
Jaguar Cars Limited, is not responsible.
However, occasional light ‘spark knock’
for a short time while accelerating or
driving up hill, may occur.
Emission control components
Owing to the legislative requirements or
options available in some countries,
a Jaguar Retailer should be consulted
where any doubt exists as to the precise
emission control system specification of
this vehicle.

4-68 On the Road
Catalytic Converters
A few precautions on the use of vehicles
fitted with catalytic converters are
necessary. These are:
1. In order to maintain the efficiency of the emission control system it is
essential that unleaded fuel is used.
Use of leaded fuel will seriously
damage the catalytic converters.
2. Heavy impact on the converter casings must be avoided.
3. The engine settings must not be altered; they have been established to
ensure that the vehicle will comply
with stringent exhaust emission
regulations. Incorrect engine settings
could cause unusually high catalytic
converter temperatures and thus
result in damage to the converter and
vehicle. If adjustment to the settings is
considered necessary, this should be
performed by a Jaguar Retailer. 4. A correctly tuned engine optimises
exhaust emissions, performance and
fuel economy and it is recommended
that the vehicle is regularly
maintained.
5. Do not continue to operate the vehicle if any engine malfunction is evident;
malfunctions should be rectified
immediately. For instance, misfire,
loss of engine performance, excessive
oil consumption or engine run-on may
lead to unusually high catalytic
converter temperatures and may
result in damage to the converters and
vehicle.
6. The use of catalytic converters increases exhaust system
temperatures, therefore, do not
operate or park the vehicle in areas
where combustible materials such as
dry grass or leaves may come into
contact with the exhaust system. 7. Do not run the engine with either a
spark plug lead disconnected or a
spark plug removed. Do not use any
device that requires an insert into a
spark plug hole in order to generate air
pressure e.g. tyre pump, paint spray
attachment etc., as this could also
result in catalyti c converter damage.
8. The vehicle is designed for normal road use. Below are examples of abuse
which could damage the catalytic
converters and vehicle. These may
lead to a dangerous condition due to
excessively high catalytic converter
temperatures.
• Competition or off-road use.
• Excessive engine speed.
• Overloading the vehicle.
• Switching off the engine whilst in gear.

5 - 8 Climate Control
Windscreen Defrost/Demist
Frost and heavy mistingTo remove frost or heavy
misting from the windscreen,
press the DEF button.
• The blower switches on automatically at a high speed but the speed can be
increased or decrea sed manually if
required.
• Air conditioning switches on automatically and cannot be
deselected.
• Recirculation is ca ncelled and cannot
be selected.
• The front screen heater and the rear screen heater/door mirror heaters
switch on automatically, provided the
engine is running.
To deselect defrost mode, press AUTO
(recommended operating mode).
Light misting To prevent or remove light
windscreen misting, select
manual air distribution to
windscreen and feet
(see page 5 - 9).
Heated Screens and Door
Mirrors
The front ( F) and
rear ( R) screen heaters
may be switched on and
off in any mode, including system off,
but only operate when the engine is
running. The door mirror heaters are also
controlled by the rear screen heater
button.
The front screen heater (if fitted) switches
off automatically after 6½ minutes.
The rear screen and door mirror heaters
switch off automatica lly after 21 minutes.
The windscreen heaters may be manually
deselected during the timed period using
the push buttons.
In cold ambient conditions, at the start of
a journey, the front and rear screen
heaters may switch on automatically for
the timed period.
Where a front screen he ater is not fitted,
the windscreen has a wiper park zone
heater which operates automatically with
no manual control.
Note: The top three lines of the rear
screen pattern are a concealed antenna
system and do not defrost the rear screen.
Air Conditioning
Press to switch the air
conditioning on or off.
The air conditioning system is
controlled automatically in AUTO mode.
Deselecting A/C cancels AUTO mode.
The air conditioning system is also
switched on automatically in defrost
mode (DEF) but cann ot be deselected.
Blower Speed
Set the blower speed as
required with the rotary
control knob. Blower speed is
shown as a series of bars on the
LCD screen.
When operating in AUTO mode, blower
speed is controlled automatically (but not
displayed) and any adjustment of the
knob will cancel AUTO mode.
Note: In AUTO mode, the blower only
operates at low speed, if heating is
required, until the engine is warm.

Roadside Emergency 6 - 3
6 Roadside Emergency
Inertia Switch
In the event of an accident, the inertia switch may trip
(depending on the severity an d type of impact), isolating
operation of the fuel pump. Once the switch has tripped it must
be reset before attempting to restart the engine.
The inertia switch is located behind the trim on the left-hand
side of the vehicle, forward of the front door post, below the
fascia. A finger access hole in the trim allows the driver to reset
the switch.
Resetting the Switch
!WARNING:
To avoid the possibility of fire or personal injury, do not
reset the inertia switch if you see or smell fuel.
If no fuel leak is apparent, reset the inertia switch as follows:
1. Turn the ignition switch to position ‘0’.
2. Press down the red reset butt on on the top of the inertia
switch.
3. Turn the ignition switch to position ‘II’, pause for a few seconds, then return the key to position ‘0’.
4. Make a further check for fuel leaks.

6 - 4 Roadside Emergency
Trunk Underfloor Access
The space under the trunk floor houses
the spare wheel, battery, jack and rear
fuse box.
To raise the floor panel, press down the
rear of handle (A) then, holding the
handle at the front, swing the floor panel
upwards ( B). Hook the handle securely
over the top edge of the trunk
opening ( C).
Emergency Starting
This vehicle is fitted with automatic
transmission. In the event of a discharged
battery preventing a normal engine start,
the vehicle cannot be started by pushing
or towing. Either use jump leads
connected to a booster battery (e.g. on
another vehicle) or fit a fully charged
battery (see page 7 - 15).
Emergency Starting Using
Jump Leads
Both the booster and discharged battery
should be treated with great care when
using jump leads. Al ways use high quality
leads capable of carrying the starter
current of the vehicle to be started.
Before commencing, the following
precautions must be taken:
• When the battery of another vehicle is being used, ensure that the vehicles
do not touch. Alternatively, remove
the charged battery and place near to,
not on, the vehicle with the
discharged battery.
• Ensure that both vehicles have all electrical services OFF,
the parkbrakes applied and the
transmission in the ‘P’ (park) position.
• Where the jump leads are of a different colour, e.g. red and black,
use red for positive (+). This aids
identification and helps to avoid
crossing positive (+) to negative (–).
Take extra care to avoid crossing the
polarity when using cables of the
same colour.

Roadside Emergency 6 - 5
Caution:
1. If using a jump start vehicle, under no circumstances should the
vehicles come into contact with
each other. This could establish an
earth connection, which may
cause sparks and damage.
2. Do not run the engine of the jump start vehicle when boost starting a
Jaguar vehicle. If the jump start
vehicle’s engine is running and
the jump leads ar e disconnected,
damage to the Jaguar vehicle’s
electrical system will result.
3. The booster battery voltage must not exceed 12 volts.
The procedure must be followed exactly,
being careful not to cause sparks:
1. Unclip the battery positive (+) terminal cover.
2. Attach one end of the red jump lead to the positive (+) terminal of the
booster battery and the other end to
the positive (+) terminal of the
discharged battery. Make sure that a
good connection is made.
Caution: Do not connect the negative
jump lead directly to the negative (–)
terminal of the discharged vehicle. 3. Attach one end of the black jump lead
to the negative (–) terminal of the
booster battery and the other end to
the earth stud on the left-hand side of
the spare wheel well.
4. Start the engine.
5. When started, allow the engine to idle for five minutes before disconnecting
the cables.
6. Disconnect the black jump lead from the earth point and the booster battery
negative (–) terminal. 7. Disconnect the red jump lead from the
positive (+) terminals of both
batteries.
8. Refit the cover to the positive (+) terminal.
9. Close the trunk floor panel.
After starting the engine, it may be
necessary to reset th e electric parkbrake
as described on page 4 - 34. See also After
battery reconnection on page 7 - 16.

Roadside Emergency 6 - 9
Wheel Changing Procedure
1. Ensure that all passengers are in a safe place, clear of the vehicle.
2. Apply the parkbrake and select gear position ‘P’ (Park).
3. Ensure that the jack is placed on firm and level ground.
Note: When one rear wheel is lifted off
the ground the selection of gear position
‘P’ (Park) will not prev ent the vehicle from
moving and possibly slipping off the jack.
!WARNING:
1. Before attempting to lift the vehicle with the jack, chock the
wheel diagonally opposite to the
wheel being replaced to prevent
the vehicle from rolling when
jacked up. A wheel chock is
supplied with the jacking
equipment for this purpose.
2. Never work under the vehicle using only the jack as a support,
always use axle stands or suitable
supports under the jacking points. Observe the instructions printed on the
jack.
Use the jack only for lifting the vehicle
during wheel changing, and only use the
jack which is stored in the vehicle.
Do not start or run the engine while the
vehicle is only supported by a jack.
Removing the wheel
Before raising the vehicle slacken but do
not remove the wheel nuts.
There are four jacking points, two each
side of the vehicle on the underside of the
floor. These provide positive location for
the jack. To locate the jacking
point, feel along the
sill panel to the cut-away portion and
then fit the jack to the body, as shown,
not to the sill panel .
Caution: Ensure before raising the
vehicle that the jack is correctly
positioned to avoid any damage to
the vehicle sills or sill panels.
Use only the correct jacking points,
never use bumpers or any other part
of the body to lift the vehicle.