2003 Nissan Altima Owner's Manual - Page 197

SPARK PLUGS 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 - 22 ft-lb (20 - 29 N·m) 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 N·m) 8. Connect the negative battery cable. 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. QR25DE 1. Disconnect the negative battery cable. WDI0005 REPLACING SPARK PLUGS Platinum-tipped spark plugs It is not necessary to replace platinum-tipped spark plugs as frequently as conventional type spark plugs because they last much longer. Follow the maintenance schedule, but do not reuse the spark plugs by cleaning or regapping. ● Always replace spark plugs with recommended or equivalent ones. 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. VQ35DE If replacement is required, please see your NISSAN dealer for assistance. Maintenance and do-it-yourself 8-21