2004 Hyundai Elantra spark plugs replace

2DRIVING YOUR HYUNDAI
15WINTER DRIVING
C160A01A-AAT
The more severe weather conditions of winter
result in greater wear and other problems. To
minimize the problems of winter driving, you
should follow these suggestions:
C160B01A-AATSnowy or Icy Conditions
To drive your vehicle in deep snow, it may be
necessary to use snow tires or to install tire
chains on your tires. If snow tires are needed,
it is necessary to select tires equivalent in size
and type to the original equipment tires. Failure
to do so may adversely affect the safety and
handling of your car. Speeding, rapid accelera-
tion, sudden brake applications, and sharp
turns are potentially very hazardous practices.
During deceleration, use engine braking to the
fullest extent. Sudden brake applications on
snowy or icy roads may cause skids to occur.
You need to keep sufficient distance between
the vehicle in front and your vehicle. Also, apply
the brake gently. It should be noted that installing
tire chains on the tire will provide a greater
driving force, but will not prevent side skids.
NOTE:Tire chains are not legal in all states. Check
state laws before fitting tire chains.
C160C01A-AAT
Use High Quality Ethylene Glycol
Coolant
Your Hyundai is delivered with high quality
ethylene glycol coolant in the cooling system. It
is the only type of coolant that should be used
because it helps prevent corrosion in the cool-
ing system, lubricates the water pump and
prevents freezing. Be sure to replace or replen-
ish your coolant in accordance with the main-
tenance schedule in Section 5. Before winter,
have your coolant tested to assure that its
freezing point is sufficient for the temperatures
anticipated during the winter.
C160D01A-AATCheck Battery and Cables
Winter puts additional burdens on the battery
system. Visually inspect the battery and cables
as described in Section 6. The level of charge
in your battery can be checked by your Hyundai
dealer or a service station.
C160E01A-AAT
Change to "Winter Weight" Oil if Neces-
sary
In some climates it is recommended that a lower
viscosity "winter weight" oil be used during cold
weather. See Section 9 for recommendations.
If you aren't sure what weight oil you should use,
consult your Hyundai dealer.
C160F01A-AATCheck Spark Plugs and Ignition System
Inspect your spark plugs as described in Sec-
tion 6 and replace them if necessary. Also
check all ignition wiring and components to be
sure they are not cracked, worn or damaged in
any way.
C160G01A-AAT
To Keep Locks from Freezing
To keep the locks from freezing, squirt an
approved de-icer fluid or glycerine into the key
opening. If a lock is covered with ice, squirt it with
an approved de-icing fluid to remove the ice. If
the lock is frozen internally, you may be able to
thaw it out by using a heated key. Handle the
heated key with care to avoid injury.

5VEHICLE MAINTENANCE REQUIREMENTS
4SCHEDULED MAINTENANCE
F030B04E-AATR :Replace I : Inspect and, after inspection, clean, adjust, repair or replace if necessary.
F030A02A-AAT
The following maintenance services must be performed to ensure good emission control and performance. Keep receipts for all vehicle emission services
to protect your emission warranty. Where both mileage and time are shown, the frequency of service is determined by whichever occurs first.
DESCRIPTION
EMISSION CONTROL ITEMS
ENGINE OIL AND FILTER
FUEL FILTER
FUEL LINES, FUEL HOSES AND CONNECTIONS
INSULATOR OF FUEL INJECTOR (2.0 L SULEV Only)
VACUUM AND CRANKCASE VENTILATION HOSES
VAPOR HOSE AND FUEL FILLER CAP
AIR CLEANER FILTER
SPARK PLUGS
SPARK PLUG CABLE
VALVE CLEARANCE No.
1
2
3
4
5
6
7
8
9MILES X 1000
KILOMETERS X 1000
MONTHS7.5
12
615
24
1222.5
36
1830
48
24
I
I*
2
I
R37.5
60
3045
72
3652.5
84
42
R
I60
96
48
I
R
I
R
R
I67.5
108
5475
120
6082.5
132
6690
144
72
I
I*
2
I
R97.5
156
78105
168
84
R
I112.5
180
90120
192
96
I
R
I
R
R
I127.5
204
102135
216
108142.5
228
114150
240
120
I
I*
2
I
R
PLATINUM COATED (2.0L CVVT)
IRIDIUM COATED (2.0L SULEV)
See Note *3
See Note *4
Note : *1 -REPLACE EVERY 7,500 MILES (12,000 KM) OR 12 MONTH.
*2 - IN CASE OF REMOVING INJECTOR FOR INSPECTION, INSULATOR AND O-RING OF INJECTOR SHOULD BE CHANGED WITH NEW ONE.
*3 - REPLACE EVERY 100,000 MILES (160,000 KM) OR 10 YEARS.
*4 - INSPECT EVERY 60,000 MILES (96,000 KM) OR 5 YEARS AND REPLACE IF NECESSARY.
See Note *1

5VEHICLE MAINTENANCE REQUIREMENTS
6
SEVERE DRIVING CONDITIONSA - Repeated short distance driving
B - Extensive idling
C - Driving in dusty, rough roads
D - Driving in areas using salt or other corrosive materials or
in very cold weather
E - Driving in sandy areas
F040A03E-AAT
MAINTENANCE UNDER SEVERE USAGE CONDITIONS
The following items must be serviced more frequently on cars normally used under severe driving conditions. Refer to the chart below for the appropriate
maintenance intervals.
R : Replace I : Inspect and, after inspection, clean, adjust, repair or replace if necessary
F - More than 50% driving in heavy city traffic during hot
weather above 90°F (32°C)
G - Driving in mountainous areas
H - Towing a trailer
I - Driving as a patrol car, taxi, or other commercial use or vehicle towing
J - Driving over 100 MPH ENGINE OIL AND FILTER
AIR CLEANER FILTER
SPARK PLUGS
BRAKE PADS, CALIPERS AND ROTORS
REAR BRAKE DRUMS/LININGS/PADS,
PARKING BRAKE
STEERING GEAR RACK, LINKAGE & BOOTS/
LOWER ARM BALL JOINT
DRIVESHAFTS AND BOOTS
MANUAL TRANSAXLE OIL
AUTOMATIC TRANSAXLE FLUID
AIR FILTER (IN FRONT OF BLOWER UNIT)
MAINTENANCE ITEM
R
R
R
I
I
I
I
R
R
REVERY 3,000 MILES (4,800 KM) OR 3 MONTHS
MORE FREQUENTLY
MORE FREQUENTLY
MORE FREQUENTLY
MORE FREQUENTLY
MORE FREQUENTLY
EVERY 7,500 MILES (12,000 KM) OR 6 MONTHS
EVERY 60,000 MILES (96,000 KM)
EVERY 30,000 MILES (48,000 KM)
MORE FREQUENTLY
DRIVING
CONDITION MAINTENANCE
INTERVALS MAINTENANCE
OPERATION
A, B, C, F, H
C, E
B, H
C, D, G, H
C, D, G, H
C, D, E, F, G
C, D, E, F
A, C, D, E, F, G, H, I, J
A, C, E, F, G, H, I
C, E

5VEHICLE MAINTENANCE REQUIREMENTS
7EXPLANATION OF SCHEDULED
MAINTENANCE ITEMS
F060F01A-AATo Vacuum, Crankcase
Ventilation Hoses
Inspect the surface of hoses for evidence of
heat and/or mechanical damage. Hard and
brittle rubber, cracking, tears, cuts, abrasions,
and excessive swelling indicate deterioration.
Particular attention should be paid to examine
those hose surfaces nearest to high heat
sources, such as the exhaust manifold.
Inspect the hose routing to assure that the
hoses do not come in contact with any heat
source, sharp edges or moving component
which might cause heat damage or mechanical
wear. Inspect all hose connections, such as
clamps and couplings, to make sure they are
secure, and that no leaks are present. Hoses
should be replaced immediately if there is any
evidence of deterioration or damage.
F060D01A-AAT
o Fuel Lines, Fuel Hoses and
Connections
Check the fuel lines, fuel hoses and connec-
tions for leakage and damage. Have a trained
technician replace any damaged or leaking
parts immediately.
F060M01A-AAT
o Engine Oil and Filter
The engine oil and filter should be changed at the
intervals specified in the maintenance sched-
ule. If the car is being driven in severe condi-
tions, more frequent oil and filter changes are
required.
F060C01A-AAT
o Fuel Filter
A clogged filter can limit the speed at which the
vehicle may be driven, damage the emission
system and cause hard starting. If an exces-
sive amount of foreign matter accumulates in
the fuel tank, the filter may require replacement
more frequently.
After installing a new filter, run the engine for
several minutes, and check for leaks at the
connections. Fuel filters should be installed by
trained technicians.
F060G01A-AAT
o Vapor Hose and Fuel Filler Cap
The vapor hose and fuel filler cap should be
inspected at those intervals specified in the
maintenance schedule. Make sure that a new
vapor hose or fuel filler cap is correctly re-
placed.
F060H01A-AATo Air cleaner filter
A Genuine Hyundai air cleaner filter is recom-
mended when the filter is replaced.
F060J01A-AATo Spark plugs
Make sure to install new spark plugs of the
correct heat range.
F060N02E-AAT
o Valve Clearance
Inspect excessive valve noise and/or engine
vibration and adjust if necessary. A qualified
technician should perform the operation.

Engine Compartment .................................................... 6-2
General Checks ............................................................ 6-3
Checking the Engine Oil ............................................... 6-4
Changing the Oil and Filter ............................................ 6-5
Checking and Changing the Engine Coolant ................ 6-6
Spark Plugs .................................................................. 6-9
Changing the Air Cleaner Filter ...................................6-11
Checking the Transaxle Oil (Manual) .........................6-12
Checking the Transaxle Fluid (Automatic)..................6-13
Checking the Brakes ..................................................6-15
Checking the Clutch Fluid...........................................6-16
Air Conditioning Care..................................................6-17
Changing The Air Filter ...............................................6-18
Checking Drive Belts..................................................6-20
Checking and Replacing Fuses..................................6-21
Checking the Battery..................................................6-22
Power Steering Fluid Level .........................................6-24
Replacement of Light Bulbs ........................................ 6-26
Bulb Wattage...............................................................6-33
Fuse Panel Description...............................................6-34
Do-It-Yourself Maintenance
66

6DO-IT-YOURSELF MAINTENANCE
9SPARK PLUGS
G060B02E-AAT
Replacing the Spark Plugs
The spark plugs should be changed at the
intervals specified in the vehicle maintenance
schedule in Section 5 or whenever engine
performance indicates they should be changed.
Symptoms that suggest poor spark plug perfor-
mance include engine misfiring under load, loss
of fuel economy, poor acceleration, etc. When
spark plugs are replaced, always use spark
plugs recommended by Hyundai. The use of
other spark plugs can result in loss of perfor-
mance, radio interference or engine damage.
NOTE:When replacing the spark plugs, genuine
Hyundai replacement parts are recom-
mended.
Recommended Spark Plugs:
* 2.0L SULEV Only.CHAMPION
NGK
RC10PYP4
PFR5N-11
IFR5G-11PLATINUM
PLATINUM
IRIDIUM*
G060A03Y-AAT
Your engine was originally equipped with plati-
num or iridium-tipped spark plugs.
Platinum or iridium-tipped spark plugs will last
longer than conventional type spark plugs and
can be identified by blue lines (platinum only) on
the ceramic shell.
NOTE:Do not clean or regap platinum or iridium-
tipped spark plugs.
G060A01L
0.039~0.043 in.
(1.0~1.1 mm)
!WARNING:The cooling fan is controlled by engine
coolant temperature and may sometimes
operate even when the engine is not run-
ning. Use extreme caution when working
near the blades of the cooling fan so that
you are not injured by a rotating fan blade.
As the engine coolant temperature de-
creases, the fan will automatically shut off.
This is a normal condition.

6DO-IT-YOURSELF MAINTENANCE
10
G060C01S-AAT
Changing the Spark Plugs
You will find it easier to change spark plugs if the
engine is cold. Always change one spark plug
at a time. This helps avoid getting the wires
mixed up.
1. Remove the center cover on the engine
rocker cover.
2. Using a clean cloth, remove any dirt that has
accumulated around the spark plug so it
cannot fall into the cylinder when the spark
plug is removed.
3. To remove the spark plug cable, pull straight
up on the insulated connector, not the cable.
Pulling on the cable may damage the carbon
core conductor.
HGK256
!WARNING:It is recommended that the engine be cool
or cold when changing the spark plugs. If
the engine is hot, you could burn yourself
on the insulated connector, the spark plug
or the engine itself.
4. When preparing to remove the old spark
plug, guide the socket down over the spark
plug, being careful not to damage the ce-
ramic insulator.
5. To remove the spark plug, turn the wrench
handle in a counterclockwise direction.
6. To replace the new spark plug, guide the
socket down over the spark plug, being
careful not to damage the ceramic insulator.
NOTE:Spark plugs should be tightened firmly.
Over-tightening can damage the threads in
the aluminum cylinder head. Leaving them
too loose can cause the spark plugs to get
very hot and possibly result in damage to
the engine.
7. Replace the cable by pushing the insulated
connector directly down onto the electrode.
Check to be sure it has snapped into place
and can't fall off.
HGK257
HGK258

10INDEX
5
Spark Plugs ......................................................................................... 6-9
Spectacle Case.................................................................................1-66
Speedometer.....................................................................................1-49
Starting Procedure.............................................................................. 2-5
Steering Wheel Free play .................................................................6-19
Steering Wheel Tilt Lever ..................................................................1-76
Stereo Sound System .......................................................................1-98
Sunroof..............................................................................................1-63
Sun visor ...........................................................................................1-69
T
Tachometer.......................................................................................1-50
Tail Gate............................................................................................1-74
Theft-Alarm System............................................................................ 1-8
Tires
Balancing........................................................................................ 8-5
Chains............................................................................................ 8-4
Changing a flat tire ......................................................................... 3-6
If you have a flat tire ....................................................................... 3-6
Information...................................................................................... 8-3
Pressure......................................................................................... 8-3
Replacement.................................................................................. 8-5
Rotation.......................................................................................... 8-4
Snow tires....................................................................................... 8-3
Spare tire........................................................................................ 3-5
Traction.......................................................................................... 8-5Towing
A trailer (or vehicle)......................................................................2-17
Emergency...................................................................................3-11
If your car must be towed ............................................................3-10
Traction Control System ....................................................... 2-12 ~ 2-13
Transaxle
Automatic........................................................................................ 2-7
Automatic transaxle fluid checking ..............................................6-14
Manual............................................................................................ 2-5
Manual transaxle fluid checking..................................................6-13
V
Vehicle Identification Number............................................................. 8-2
Vehicle Specifications
Engine ............................................................................................. 9-3
Lubrication chart............................................................................ 9-4
Measurement................................................................................. 9-2
W
Warning Lights and Indicator Lights.................................................1-45
Windows
Power...........................................................................................1-11
Windshield Wiper and Washer ..........................................................1-56
Windshield Wiper Blades..................................................................6-11