octane CADILLAC DEVILLE 2004 8.G Owners Manual

If the light stops ashing and remains on steady, see “If
the Light Is On Steady” following.
If the light continues to ash, when it is safe to do so,
stop the vehicle.Find a safe place to park your vehicle.
Turn the key off, wait at least 10 seconds and restart
the engine. If the light remains on steady, see “If
the Light Is On Steady” following. If the light is still
ashing, follow the previous steps, and see your dealer
for service as soon as possible.
If the Light Is On Steady
You may be able to correct the emission system
malfunction by considering the following:
Did you recently put fuel into your vehicle?
If so, reinstall the fuel cap, making sure to fully install
the cap. SeeFilling Your Tank on page 5-8. The
diagnostic system can determine if the fuel cap has
been left off or improperly installed. A loose or missing
fuel cap will allow fuel to evaporate into the atmosphere.
A few driving trips with the cap properly installed
should turn the light off.Did you just drive through a deep puddle of water?
If so, your electrical system may be wet. The condition
will usually be corrected when the electrical system
dries out. A few driving trips should turn the light off.
Have you recently changed brands of fuel?
If so, be sure to fuel your vehicle with quality fuel. See
Gasoline Octane on page 5-5. Poor fuel quality will
cause your engine not to run as efficiently as designed.
You may notice this as stalling after start-up, stalling
when you put the vehicle into gear, misring, hesitation
on acceleration or stumbling on acceleration. (These
conditions may go away once the engine is warmed up.)
This will be detected by the system and cause the
light to turn on.
If you experience one or more of these conditions,
change the fuel brand you use. It will require at least
one full tank of the proper fuel to turn the light off.
If none of the above steps have made the light turn off,
your dealer can check the vehicle. Your dealer has
the proper test equipment and diagnostic tools to x any
mechanical or electrical problems that may have
developed.
3-57

Service............................................................5-3
Doing Your Own Service Work.........................5-4
Adding Equipment to the Outside of Your
Vehicle......................................................5-5
Fuel................................................................5-5
Gasoline Octane............................................5-5
Gasoline Specications....................................5-5
California Fuel...............................................5-6
Additives.......................................................5-6
Fuels in Foreign Countries...............................5-7
Filling Your Tank............................................5-8
Filling a Portable Fuel Container.....................5-12
Checking Things Under the Hood....................5-12
Hood Release..............................................5-13
Engine Compartment Overview.......................5-14
Engine Oil...................................................5-15
Engine Air Cleaner/Filter................................5-22
Automatic Transaxle Fluid..............................5-24
Engine Coolant.............................................5-27
Coolant Surge Tank Pressure Cap..................5-31
Engine Overheating.......................................5-31
Cooling System............................................5-34
Power Steering Fluid.....................................5-40
Windshield Washer Fluid................................5-41
Brakes........................................................5-43Battery........................................................5-46
Jump Starting...............................................5-48
Headlamp Aiming...........................................5-55
Headlamp Horizontal Aiming...........................5-56
Headlamp Vertical Aiming..............................5-57
Bulb Replacement..........................................5-59
Halogen Bulbs..............................................5-59
Headlamps..................................................5-59
Front Turn Signal, Sidemarker, Parking and
Cornering Lamps.......................................5-63
Center High-Mounted Stoplamp (CHMSL).........5-64
Taillamps, Turn Signal, and Stoplamps............5-64
Replacement Bulbs.......................................5-64
Windshield Wiper Blade Replacement..............5-65
Tires..............................................................5-66
Ination - Tire Pressure.................................5-74
Tire Pressure Monitor Operation.....................5-76
Tire Inspection and Rotation...........................5-78
When It Is Time for New Tires.......................5-79
Buying New Tires.........................................5-80
Uniform Tire Quality Grading..........................5-81
Wheel Alignment and Tire Balance..................5-82
Wheel Replacement......................................5-82
Tire Chains..................................................5-84
Section 5 Service and Appearance Care
5-1

Adding Equipment to the Outside of
Your Vehicle
Things you might add to the outside of your vehicle can
affect the airow around it. This may cause wind
noise and affect windshield washer performance. Check
with your dealer before adding equipment to the
outside of your vehicle.
Fuel
Use of the recommended fuel is an important part of the
proper maintenance of your vehicle.
Gasoline Octane
Use regular unleaded gasoline with a posted octane of
87 or higher. However, for best performance and for
trailer towing, you may wish to use middle grade
or premium unleaded gasoline. If the octane is less than
87, you may get a heavy knocking noise when you
drive. If this occurs, use a gasoline rated at 87 octane
or higher as soon as possible. Otherwise, you might
damage your engine.
Gasoline Specications
It is recommended that gasoline meet specications
which were developed by automobile manufacturers
around the world and contained in the World-Wide Fuel
Charter which is available from the Alliance of
Automobile Manufacturers at
www.autoalliance.org/fuel_charter.htm. Gasoline
meeting these specications could provide improved
driveability and emission control system performance
compared to other gasoline.
In Canada, look for the
“Auto Makers’ Choice”
label on the pump.
Canada Only
5-5

Notice:Your vehicle was not designed for fuel that
contains methanol. Do not use fuel containing
methanol. It can corrode metal parts in your fuel
system and also damage the plastic and rubber
parts. That damage would not be covered under
your warranty.
Some gasolines that are not reformulated for
low emissions may contain an octane-enhancing
additive called methylcyclopentadienyl manganese
tricarbonyl (MMT); ask the attendant where you
buy gasoline whether the fuel contains MMT. General
Motors does not recommend the use of such gasolines.
Fuels containing MMT can reduce the life of spark
plugs and the performance of the emission control
system may be affected. The malfunction indicator lamp
may turn on. If this occurs, return to your authorized
GM dealer for service.Fuels in Foreign Countries
If you plan on driving in another country outside the
United States or Canada, the proper fuel may be hard
to nd. Never use leaded gasoline or any other fuel
not recommended in the previous text on fuel. Costly
repairs caused by use of improper fuel would not
be covered by your warranty.
To check the fuel availability, ask an auto club, or
contact a major oil company that does business in the
country where you will be driving.
5-7

Using Your Maintenance Schedule
We at General Motors want to help you keep your
vehicle in good working condition. But we do not know
exactly how you will drive it. You may drive very
short distances only a few times a week. Or you may
drive long distances all the time in very hot, dusty
weather. You may use your vehicle in making deliveries.
Or you may drive it to work, to do errands or in many
other ways.
Because of all the different ways people use their
vehicles, maintenance needs vary. You may need more
frequent checks and replacements. So please read
the following and note how you drive. If you have any
questions on how to keep your vehicle in good condition,
see your GM Goodwrench dealer.
This schedule is for vehicles that:
carry passengers and cargo within recommended
limits. You will nd these limits on the tire and
loading information label. SeeLoading Your Vehicle
on page 4-35.
are driven on reasonable road surfaces within legal
driving limits.
use the recommended fuel. SeeGasoline Octane
on page 5-5.The services inScheduled Maintenance on page 6-4
should be performed when indicated. SeeAdditional
Required Services on page 6-6andMaintenance
Footnotes on page 6-8for further information.
{CAUTION:
Performing maintenance work on a vehicle can
be dangerous. In trying to do some jobs, you
can be seriously injured. Do your own
maintenance work only if you have the
required know-how and the proper tools and
equipment for the job. If you have any doubt,
see your GM Goodwrench dealer to have a
qualied technician do the work.
Some maintenance services can be complex. So,
unless you are technically qualied and have the
necessary equipment, you should have your GM
Goodwrench dealer do these jobs.
When you go to your GM Goodwrench dealer for your
service needs, you will know that GM-trained and
supported service technicians will perform the work
using genuine GM parts.
6-3

Following Distance..........................................4-46
Front Ashtray.................................................3-31
Front Storage Area.........................................2-51
Fuel............................................................... 5-5
Additives...................................................... 5-6
California Fuel.............................................. 5-6
Data Display...............................................3-61
Filling a Portable Fuel Container....................5-12
Filling Your Tank........................................... 5-8
Fuels in Foreign Countries.............................. 5-7
Gage.........................................................3-60
Gasoline Octane........................................... 5-5
Gasoline Specications.................................. 5-5
Full Floor Console Storage Area.......................2-51
Fuses
Fuses and Circuit Breakers.........................5-108
Windshield Wiper.......................................5-107
G
Gage
Engine Coolant Temperature.........................3-54
Fuel..........................................................3-60
Speedometer..............................................3-47
Tachometer.................................................3-49
Garage Door Opener.......................................2-46
Garment Hooks..............................................2-53Gasoline
Octane........................................................ 5-5
Specications............................................... 5-5
Gate Operator and Canadian Programming........2-49
Glove Box.....................................................2-50
Glovebox-Mounted CD Changer......................3-110
GM Mobility Program for Persons with
Disabilities.................................................... 7-6
H
Hazard Warning Flashers................................... 3-6
Headlamp
Aiming.......................................................5-55
Horizontal Aiming.........................................5-56
Vertical Aiming............................................5-57
Headlamp High/Low-Beam Changer...................3-10
Headlamp Wiring...........................................5-107
Headlamps....................................................5-59
Bulb Replacement.......................................5-59
Front Turn Signal, Sidemarker, Parking and
Cornering Lamps......................................5-63
Halogen Bulbs............................................5-59
Heated Seats................................................... 1-3
Heated Steering Wheel..................................... 3-8
Highway Hypnosis...........................................4-25
Hill and Mountain Roads..................................4-26
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