2002 NISSAN ALTIMA spark plugs

8 Maintenance and do-it-yourself
Maintenance requirements .....................................8-2
General maintenance .............................................8-3
Explanation of general maintenance
items ..................................................................8-3
Maintenance precautions .......................................8-5
Engine compartment check locations QR
engine .....................................................................8-7
Engine compartment check locations VQ
engine .....................................................................8-8
Engine cooling system ...........................................8-9
Checking engine coolant level ..........................8-9
Changing engine coolant ................................8-10
Engine oil .............................................................8-10
Checking engine oil level ................................8-10
Changing engine oil ........................................8-11
Changing engine oil filter.................................8-13
Automatic transmission fluid ................................8-14
Temperature conditions for checking ..............8-14
Power steering fluid..............................................8-15
Brake and clutch fluid...........................................8-16
Brake fluid........................................................8-16
Clutch fluid .......................................................8-16Window washer fluid ............................................8-17
Battery ..................................................................8-17
Jump starting ...................................................8-18
Drive belts ............................................................8-19
Spark plugs ..........................................................8-20
Replacing spark plugs (QR25DE) ...................8-20
Replacing spark plugs (VQ35DE) ...................8-20
Air cleaner ............................................................8-21
Cabin air filter (if so equipped) ........................8-21
Windshield wiper blades ......................................8-24
Cleaning ..........................................................8-24
Replacing .........................................................8-24
Parking brake and brake pedal ............................8-25
Checking parking brake...................................8-25
Checking brake pedal .....................................8-25
Brake booster ..................................................8-26
Clutch pedal .........................................................8-26
Checking clutch pedal .....................................8-26
Fuses ....................................................................8-27
Engine compartment .......................................8-27
Passenger compartment .................................8-28
Keyfob battery replacement .................................8-29
ZX

Platinum-tipped spark plugs
It is not necessary to replace platinum-
tipped spark plugs as frequently as conven-
tional type spark plugs because they last
much longer. Follow the maintenance
schedule, but do not reuse the spark plugs
by cleaning or regapping.
cAlways replace spark plugs with rec-
ommended or equivalent ones.
WARNING
Be sure the engine and ignition switch
are off and that the parking brake is
engaged securely.
CAUTION
Be sure to use the correct socket to
remove the spark plugs. An incorrect
socket can damage the spark plugs.
REPLACING SPARK PLUGS
(QR25DE)
1. Disconnect the negative battery cable.
2. Remove the coil pack bolt.
3. Remove the coil pack/spark plug boot
from the spark plug.
4. Remove the spark plugs with a spark
plug socket.
The plug socket has a rubber seal that
holds the spark plug so it does not fall
when it is pulled out. Make sure each
spark plug is snugly fitted into the spark
plug socket.5. Fit the new plugs, one at a time, into the
spark plug socket and install them.Use
only the specified spark plugs.Turn
each plug several full turns by hand, then
tighten with the spark plug socket to the
correct torque. Do not overtighten.
Spark plug tightening torque:
14 to 22 ft-lb
(20 to 29 Nzm)
6. Install the coil pack/spark plug boot on
the spark plug by pushing it on until you
feel a snap.
7. Install the coil pack bolt.
Coil pack tightening torque:
48-65 in-lb
(5.4 - 7.3 Nzm)
8. Connect the negative battery cable.
REPLACING SPARK PLUGS
(VQ35DE)
If replacement is required, see your NIS-
SAN dealer for servicing.
WDI0005
SPARK PLUGS
8-20Maintenance and do-it-yourself
ZX

ENGINE
Model QR25DE VQ35DE
Type Gasoline, 4-cycle, DOHC Gasoline, 4-cycle, DOHC
Cylinder arrangement 4-cylinder, in-line 6-cylinder, V-block Slanted at 60É
Bore x Stroke in (mm) 3.5 x 3.9 (89.0 x 100.0) 3.760 x 3.205 (95.5 x 81.4)
Displacement cu in (cm
3) 152.56 (2,500) 151.82 (2.488) 213.45 (3,498)
Firing order 1-3-4-2 1-2-3-4-5-6
Idle speed
M/T
See the ``Emission Control label''
on the underside of the hood A/T (in ``N'' position)
Ignition timing
(degree B.T.D.C. at idle speed)
CO % at idle
Spark plugStandard PLFR5A-11 PLFR5A-11
Hot PLFR4A-11 PLFR4A-11
Cold PLFR6A-11 PLFR6A-11
Spark plug gap (Nominal) in (mm) 0.043 (1.1) 0.043 (1.1)
Camshaft operation Timing chain Timing chain
The spark ignition system of this vehicle meets all requirements of the Canadian Interference - Causing Equipment Regulations.
SPECIFICATIONS
9-8Technical and consumer information
ZX