2004 Nissan Sentra Owner's Manual - Page 185

AIR CLEANER 3. Disconnect the ignition coils from the spark plugs. 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 - 22 ft-lb (20 - 29 N·m) 6. Holding the boot, reconnect each high tension cable/ignition coil to its proper spark plug by pushing it on until you feel a snap. 7. Install the ignition coil bolts. Ignition coil bolt tightening torque: 33 - 44 in-lb (3.8 - 5.0 N·m) Connect the ignition coil connector. 8. Install the engine cover (GR25DE engine). WARNING ● Operating the engine with the air cleaner removed can cause you or others to be burned. The air cleaner not only cleans the air, it stops the flame if the engine backfires. If it isn't there, and the engine backfires, you could be burned. Do not drive with the air cleaner removed, and be careful when working on the engine with the air cleaner removed. ● Never pour fuel into the throttle body or attempt to start the engine with the air cleaner removed. Doing so could result in serious injury. ADI0631 The air cleaner filter should not be cleaned and reused. Replace it according to the maintenance intervals shown in the "NISSAN Service and Maintenance Guide." When replacing the filter, wipe the inside of the air cleaner filter housing and the cover with a damp cloth. Maintenance and do-it-yourself 8-23