1999 Nissan Altima Change Spark Plugs

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Nissan introduced the mid-sized Altima in the 1993 model year. The Altima received its first redesign in the 1998 model year, as Nissan slightly modified its appearance to modernize the sedan. The 1999 model year Altima came fitted with a 150-horsepower, 2.4-liter four-cylinder engine. Nissan recommends replacing the platinum-tipped spark plugs in the 1999 Altima every 60,000 miles to help keep the engine running smoothly. While replacing these spark plus, it is best to inspect and replace the ignition wires as needed.

Tools Used[edit]

Spark plug gap tool
Spark plug socket
6-inch extension
Torque wrench

Change Spark Plugs[edit]

  • Check the gap on all four new FR5-AP10, or equivalent spark plugs, using a spark plug gap tool. Nissan recommends that the Altima's spark plugs have a gap of 0.037 to 0.041 inches. Replace any incorrectly gapped plugs for new ones, as these platinum-tipped plugs are not adjustable.
  • Open the Altima's hood and locate the spark plug wires on top of the engine. Remove one spark plug wire by grabbing the thick, rubber boot on the engine side of the wire and pulling upward with a twisting motion.
  • Inspect the disconnected spark plug wire for any defects, such as brittleness, cracks or extreme visual aging. Replace the spark plug wires as a complete set if any defects exist.
  • Remove the old spark plug, using a ratchet, 6-inch extension and a spark plug socket. Pull the old plug from the spark plug socket and insert a new plug. Hand-tighten the new spark plug into the engine, using a spark plug socket and 6-inch extension.
  • Connect a torque wrench to the 6-inch extension and spark plug socket, and apply 14 to 22 foot-pounds of torque to the spark plug.
  • Repeat Steps 2 through 5 until you replace all four spark plugs.
  • Close the Altima's hood.