2004 TOYOTA TACOMA Spark plug

’04 Tacoma U (L/O 0309)
203
2004 TACOMA from Sep. ’03 Prod. (OM35814U)
INFORMATION BEFORE DRIVING YOUR
TOYOTA
Information before driving your Toyota
Off−road vehicle precautions 204
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Break −in period 205
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . \
. . . . . . . .
Fuel 205
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . \
. . . . . . . . . . . . . . . . . . .
Operation in foreign countries 207
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Three −way catalytic converters 207
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Engine exhaust cautions 208
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . \
Facts about engine oil consumption 209
. . . . . . . . . . . . . . . . . . . . . . . . . .
Twin ground electrode spark plugs 210
. . . . . . . . . . . . . . . . . . . . . . . . . . .
Brake system 210
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . \
. . . . . . . . . .
Brake pad wear limit indicators 215
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Rear step bumper 215
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . \
. . . . . .
Step side bed 215
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . \
. . . . . . . . . .
Your Toyota’s identification 216
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Suspension and chassis 217
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . \
Tire information 218
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . \
. . . . . . . . .
Vehicle load limits 226
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . \
. . . . . .
Cargo and luggage 227
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . \
. . . . .
Types of tires 229
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . \
. . . . . . . . . . .
SECTION 2

’04 Tacoma U (L/O 0309)
210
2004 TACOMA from Sep. ’03 Prod. (OM35814U)
IMPORTANCE OF ENGINE OIL LEVEL
CHECK
One of the most important points in prop-
er vehicle maintenance is to keep the en-
gine oil at the optimum level so that oil
function will not be impaired. Therefore, it
is essential that the oil level be checked
regularly. Toyota recommends that the oil
level be checked every time you refuel
the vehicle.
NOTICE
Failure to check the oil level regularly
could lead to serious engine trouble
due to insufficient oil.
For detailed information on oil level check,
see “Checking the engine oil level” in Sec-
tion 7−2.
Your engine is fitted with twin ground
electrode spark plugs.
NOTICE
Use only twin ground electrode spark
plugs for your engine performance.
The tandem master cylinder brake system
is a hydraulic system with two separate
sub −systems. If either sub −system s hould
fail, the other will still work. However, the
pedal will be harder to press, and your
stopping distance will increase. Also, the
brake system warning light may come on.
CAUTION
Do not drive your vehicle with only a
single brake system. Have your
brakes fixed immediately.
BRAKE BOOSTER (without vehicle sta-
bility control system)
The brake booster uses engine vacuum to
power −assist the brakes. If the engine
should quit while you are driving, you can
bring the vehicle to a stop with normal
pedal pressure. There is enough reserved
vacuum for one or two stops—but no
more!
Twin ground electrode spark
plugs (5VZFE engine) Brake system

’04 Tacoma U (L/O 0309)
247
2004 TACOMA from Sep. ’03 Prod. (OM35814U)
To avoid serious personal injury and
damage to your vehicle which might re-
sult from battery explosion, acid burns,
electrical burns, or damaged electronic
components, these instructions must be
followed precisely.
If you are unsure about how to follow this
procedure, we strongly recommend that
you seek the help of a competent me-
chanic or towing service.
CAUTION
Batteries contain sulfuric acid
which is poisonous and corrosive.
Wear protective safety glasses when
jump starting, and avoid spilling
acid on your skin, clothing, or ve-
hicle.
If you should accidentally get acid
on yourself or in your eyes, remove
any contaminated clothing and flush
the affected area with water imme-
diately. Then get immediate medical
attention. If possible, continue to
apply water with a sponge or cloth
while en route to the medical office.
The gas normally produced by a
battery will explode if a flame or
spark is brought near. Use only
standardized jumper cables and do
not smoke or light a match while
jump starting.
NOTICE
The battery used for boosting must
be 12 V. Do not jump start unless you
are sure that the booster battery is
correct.
JUMP STARTING PROCEDURE1. If the booster battery is installed in another vehicle, make sure the vehicles
are not touching. Turn off all unneces-
sary lights and accessories.
2. If required, remove all the vent plugs from the booster and discharged batter-
ies. Lay a cloth over the open vents
on the batteries. (This helps reduce the
explosion hazard, personal injuries and
burns.)
3. If the engine in the vehicle with the booster battery is not running, start it
and let it run for a few minutes. During
jump starting, run the engine at about
2000 rpm with the accelerator pedal
lightly depressed.
(c) Jump starting

’04 Tacoma U (L/O 0309)
287
2004 TACOMA from Sep. ’03 Prod. (OM35814U)
CAUTION
When the engine is running, keep
hands, clothing, and tools away
from the moving fan and engine
drive belts. (Removing rings,
watches, and ties is advisable.)
Right after driving, the engine
compartment—the engine, radiator,
exhaust manifold, power steering
fluid reservoir and spark plug
boots, etc.—will be hot. So be care-
ful not to touch them. Oil, fluids
and spark plugs may also be hot.
If the engine is hot, do not remove
the radiator cap or loosen the drain
plugs to prevent burning yourself.
Do not smoke, cause sparks or al-
low open flames around fuel or the
battery. Their fumes are flammable.
Do not get under your vehicle with
just the body jack supporting it. Al-
ways use automotive jack stands or
other solid supports.
Use eye protection whenever you
work on or under your vehicle
where you may be exposed to flying
or falling material, fluid spray, etc.
Used engine oil contains potentially
harmful contaminants which may
cause skin disorders such as in-
flammation or skin cancer, so care
should be taken to avoid prolonged
and repeated contact with it. To re-
move used engine oil from your
skin, wash thoroughly with soap
and water.
Do not leave used oil within the
reach of children.
Dispose of used oil and filter only
in a safe and acceptable manner.
Do not dispose of used oil and fil-
ter in household trash, in sewers or
onto the ground. Call your dealer or
a service station for information
concerning recycling or disposal.
Be extremely cautious when work-
ing on the battery. It contains poi-
sonous and corrosive sulfuric acid.
NOTICE
Remember that battery and ignition
cables carry high currents or volt-
ages. Be careful of accidentally
causing a short circuit.
 Add only “Toyota Super Long Life
Coolant” or similar high quality eth-
ylene glycol based nonsilicate,
nonamine, nonnitrite, and nonbo-
rate coolant with longlife hybrid
organic acid technology to fill the
radiator. And if you spill some of
the coolant, be sure to wash it off
with water to prevent it from dam-
aging the parts or paint.
 Do not allow dirt or anything else
to fall through the spark plug holes.
 Do not pry the outer electrode of a
spark plug against the center elec-
trode.
 Use only spark plugs of the speci-
fied type. Using other types will
cause engine damage, loss of per-
formance or radio noise.
 Do not overfill automatic transmis-
sion fluid, or the transmission
could be damaged.

’04 Tacoma U (L/O 0309)
323
2004 TACOMA from Sep. ’03 Prod. (OM35814U)
ENGINE
Valve clearance (engine cold), mm (in.):2RZ− FE and 3RZ −FE engines
Intake 0.15—0.25 (0.006—0.010)
Exhaust 0.25—0.35 (0.010—0.014)
5VZ− FE engine
Intake 0.13—0.23 (0.006—0.009)
Exhaust 0.27—0.37 (0.011—0.014)
Spark plug type: 2RZ− FE and 3RZ −FE engines
DENSO K16R −U11
NGK BKR5EYA− 11
5VZ− FE engine
DENSO K16TR11
NGK BKR5EKB−11
Spark plug gap, mm (in.): 1.1 (0.043) Drive belt tension measured with Bor-
roughs drive belt tension gauge No.
BT
−33− 73F (used belt), lbf:
2RZ− FE and 3RZ −FE engines
Generator belt 115 20
Air conditioning compressor belt
100 20
Power steering pump belt
100
+20
15
5VZ−FE engine
Generator belt 100 20
Air conditioning compressor belt 100 20
Power steering pump belt
100
+20
15
ENGINE LUBRICATION
Oil capacity (drain and refill),
L (qt., Imp. qt.):
Tw o −wheel drive models except Pre
Runner
2RZ− FE engine
With filter 5.5 (5.8, 4.8)
Without filter 4.8 (5.0, 4.2)
5VZ− FE engine
With filter 5.4 (5.7, 4.8)
Without filter 5.1 (5.4, 4.5)
Four −wheel drive models and Pre
Runner
3RZ− FE engine
With filter 5.4 (5.7, 4.8)
Without filter 4.7 (5.0, 4.1)
5VZ− FE engine
With filter 5.2 (5.5, 4.6)
Without filter 4.9 (5.2, 4.3)
“Toyota Genuine Motor Oil” is f illed in
your Toyota vehicle. Use Toyota approved
“Toyota Genuine Motor Oil” or equivalent
to satisfy the following grade and
viscosity.
Oil grade: API grade SL “Energy −Conserving” or
ILSAC multigrade engine oil
Service specifications

’04 Tacoma U (L/O 0309)
2004 TACOMA from Sep. ’03 Prod. (OM35814U)
Where to obtain the Repair Manual
The repair manual for TOYOTA Tacoma, writ-
ten in English, may be purchased as applicable
from any Toyota dealer.
Pub. Name: 2004 TOYOTA Tacoma Repair Manual
Pub. No.: RM1090U1 RM1090U2
Maintenance procedures for the engine,
chassis, body, electric al system, and more,
are clearly explained and illustrated.
Periodic maintenance and tuneup
Periodic maintenance and tuneup helps to pre-
vent small problems from growing into larger ones lat-
er on. The repair manual outlines exactly what main-
tenance is required and clearly explains how to do the
work yourself stepbystep.
Areas covered include such things as spark plug re-
placement, valve clearance adjustment and engine oil
and filter replacement.