octane GMC SIERRA DENALI 2004 Owners Manual

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. See
Filling Your Tank on page 5-6. 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 5-4. 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, mis®ring, 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.
Emissions Inspection and Maintenance
Programs
Some state/provincial and local governments have or
may begin programs to inspect the emission control
equipment on your vehicle. Failure to pass this
inspection could prevent you from getting a vehicle
registration.
Here are some things you need to know to help your
vehicle pass an inspection:
Your vehicle will not pass this inspection if the Check
Engine light is on or not working properly.
Your vehicle will not pass this inspection if the OBD
(on-board diagnostic) system determines that critical
emission control systems have not been completely
diagnosed by the system. The vehicle would be
considered not ready for inspection.
3-42

Service............................................................5-3
Doing Your Own Service Work.........................5-3
Adding Equipment to the Outside of Your
Vehicle......................................................5-4
Fuel................................................................5-4
Gasoline Octane............................................5-4
Gasoline Speci®cations....................................5-4
California Fuel...............................................5-5
Additives.......................................................5-5
Fuels in Foreign Countries...............................5-6
Filling Your Tank............................................5-6
Filling a Portable Fuel Container.......................5-8
Checking Things Under the Hood.....................5-8
Hood Release................................................5-9
Engine Compartment Overview.......................5-10
Engine Oil...................................................5-11
Engine Air Cleaner/Filter................................5-16
Automatic Transmission Fluid.........................5-18
Engine Coolant.............................................5-21
Coolant Surge Tank Pressure Cap..................5-24
Engine Overheating.......................................5-25
Cooling System............................................5-28Engine Fan Noise.........................................5-34
Power Steering Fluid.....................................5-34
Windshield Washer Fluid................................5-35
Brakes........................................................5-36
Battery........................................................5-40
Jump Starting...............................................5-41
All-Wheel Drive..............................................5-46
Rear Axle.......................................................5-47
Front Axle......................................................5-48
Bulb Replacement..........................................5-49
Halogen Bulbs..............................................5-49
Headlamps..................................................5-49
Front Turn Signal, Sidemarker and Daytime
Running Lamps.........................................5-50
Roof Marker Lamps......................................5-52
Center High-Mounted Stoplamp (CHMSL) and
Cargo Lamp.............................................5-54
Pickup Box Identi®cation and Fender
Marker Lamps...........................................5-55
Taillamps.....................................................5-56
Replacement Bulbs.......................................5-57
Section 5 Service and Appearance Care
5-1

CAUTION: (Continued)
·
Be sure to use the proper nuts, bolts and
other fasteners. ªEnglishº and ªmetricº
fasteners can be easily confused. If you
use the wrong fasteners, parts can later
break or fall off. You could be hurt.
Adding Equipment to the Outside of
Your Vehicle
Things you might add to the outside of your vehicle can
affect the air¯ow 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. 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. A little pinging noise when you accelerate
or drive uphill is considered normal. This does not
indicate a problem exists or that a higher-octane fuel is
necessary. If you are using 87 octane or higher-octane
fuel and hear heavy knocking, your engine needs
service.
Gasoline Speci®cations
It is recommended that gasoline meet speci®cations
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.
Gasoline meeting these speci®cations could provide
improved driveability and emission control system
performance compared to other gasoline.
5-4

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.
Filling Your Tank
{CAUTION:
Fuel vapor burns violently and a fuel ®re can
cause bad injuries. To help avoid injuries to
you and others, read and follow all the
instructions on the pump island. Turn off your
engine when you are refueling. Do not smoke
if you are near fuel or refueling your vehicle.
Keep sparks, ¯ames and smoking materials
away from fuel. Do not leave the fuel pump
unattended when refueling your vehicle Ð this
is against the law in some places. Keep
children away from the fuel pump; never let
children pump fuel.
The fuel cap is located behind a hinged door on the
driver's side of the vehicle.
5-6

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. See
Loading Your Vehicle
on page 4-48.
·are driven on reasonable road surfaces within legal
driving limits.
·are driven off-road in the recommended manner.
See
Operating Your All-Wheel-Drive Vehicle Off
Paved Roads on page 4-18.
·use the recommended fuel. SeeGasoline Octane
on page 5-4
.The services in
Scheduled Maintenance on page 6-4should 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
quali®ed technician do the work.
Some maintenance services can be complex. So,
unless you are technically quali®ed 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

Engine (cont.)
Engine Compartment Overview......................5-10
Exhaust.....................................................2-29
Fan Noise..................................................5-34
Oil .............................................................5-11
Overheating................................................5-25
Starting......................................................2-19
ENGINE COOLANT HOT.................................3-59
Engine Hour Meter Display...............................3-29
Engine Oil Additives........................................5-14
ENGINE OVERHEATED..................................3-59
Entry Lighting.................................................3-16
Environmental Concerns..................................4-20
Erasing HomeLink
žButtons..............................2-41
Event Data Records (EDR)................................ 7-9
Exit Lighting...................................................3-16
Express-Down Windows...................................2-14
Extender, Safety Belt.......................................1-29
Exterior Lamps...............................................3-12
F
Filter
Engine Air Cleaner......................................5-16
Finding a Program Type (PTY) Station
(RDS and XMŸ).........................................3-69
Finding a Station............................................3-67
Finish Care....................................................5-99
Finish Damage.............................................5-102Fixed Mast Antenna........................................3-88
Flash-to-Pass................................................... 3-7
Flat Tire........................................................5-75
Flat Tire, Changing.........................................5-76
Fluid
Automatic Transmission................................5-18
Power Steering...........................................5-34
Windshield Washer......................................5-35
FM Stereo.....................................................3-86
Fog Lamps....................................................3-15
Folding the Rear Seat....................................... 1-8
Following Distance..........................................4-66
Front Axle......................................................5-48
Front Reading Lamps......................................3-17
Fuel............................................................... 5-4
Additives...................................................... 5-5
California Fuel.............................................. 5-5
Filling a Portable Fuel Container..................... 5-8
Filling Your Tank........................................... 5-6
Fuels in Foreign Countries.............................. 5-6
Gage.........................................................3-45
Gasoline Octane........................................... 5-4
Gasoline Speci®cations.................................. 5-4
Low Warning Light.......................................3-45
Fuel Information Button....................................3-49
FUEL LEVEL LOW.........................................3-59
Fuses
Fuses and Circuit Breakers.........................5-105
Windshield Wiper.......................................5-105
6

G
Gage
Engine Coolant Temperature.........................3-38
Fuel..........................................................3-45
Oil Pressure...............................................3-43
Speedometer..............................................3-29
Tachometer.................................................3-29
Transmission Temperature.............................3-39
Voltmeter Gage...........................................3-36
Garage Door Opener.......................................2-38
Gasoline
Octane........................................................ 5-4
Speci®cations............................................... 5-4
Gate Operator and Canadian Programming........2-41
Getting Familiar with Off-Road Driving................4-20
Glove Box.....................................................2-42
GM Mobility Program for Persons with
Disabilities.................................................... 7-5
H
Hazard Warning Flashers................................... 3-4
Head Restraints............................................... 1-7
Headlamp High/Low-Beam Changer.................... 3-6
Headlamps....................................................5-49
Bulb Replacement.......................................5-49
Front Turn Signal, Sidemarker and Daytime
Running Lamps........................................5-50Headlamps (cont.)
Halogen Bulbs............................................5-49
Pickup Box Identi®cation and Fender
Marker Lamps.........................................5-55
Roof Marker Lamps.....................................5-52
Heated Seats................................................... 1-4
Heating.........................................................3-24
Highway Hypnosis...........................................4-39
Hill and Mountain Roads..................................4-40
Hitches..........................................................4-63
HomeLink
žTransmitter....................................2-38
HomeLinkžTransmitter, Programming................2-39
Hood
Checking Things Under.................................. 5-8
Release....................................................... 5-9
Horn............................................................... 3-5
How to Add Coolant to the Coolant
Surge Tank.................................................5-30
How to Add Fluid............................................5-20
How to Check........................................5-18, 5-67
How to Check Lubricant...................................5-47
How to Check Power Steering Fluid..................5-35
How to Inspect...............................................5-16
How to Use This Manual...................................... ii
How to Wear Safety Belts Properly...................1-14
Hydroplaning..................................................4-35
7