← RX Lexus RX repair manuals →
Autopapyrus · Lexus RX 2.7 (1AR-FE, 188 hp) (2011)
https://autopapyrus.com/guides/lexus/rx/spark-plug-replacement/
Compiled automatically from service literature and owner experience. Specs are for the typical configuration — check them against your exact car before you start.

Lexus RX 2.7 (1AR-FE, 188 hp) (2011): Spark Plug Replacement

On the 1AR-FE (2.7 L), the four spark plugs sit vertically under the plastic engine cover. Replacement is a scheduled maintenance item every 90,000 km. The procedure does not require removing the intake manifold, but access to the rear plugs is limited, so work carefully.

Difficulty: Medium Time: 1-1.5 hours Steps: 11 Tools: 16 mm spark plug socket (or socket with extension), ratchet, torque wrench, flat-head and Phillips screwdrivers, shop rags.

Part

  • 🔩 Toyota/Denso 90919-01247 or 90919-01233 (iridium, gap 1.1 mm, factory pre-set). Alternatives: Denso SK20R11, NGK ILFR6A11. Quantity: 4 pcs (one set)
There's a full repair manual for this car Every system, wiring diagrams and torque specs — not just this job. Chilton and 3 more. See manuals →

Step by step

11 steps
  1. Open the hood and let the engine cool down (at least 30 minutes after shutting it off).
  2. Remove the plastic decorative engine cover (held by 4-6 clips around the perimeter, pull it straight up).
  3. Disconnect the connectors from the four ignition coils (press the locking tab and pull toward you).
  4. Remove the mounting bolt of each ignition coil (10 mm socket), then pull the coils straight up and out.
  5. Blow out the spark plug wells with compressed air or wipe them with a rag so that no dirt falls into the cylinder.
  6. Using the 16 mm spark plug socket, unscrew each plug counterclockwise (turn the first half-turn smoothly, without jerking).
  7. Inspect the old plugs: the normal insulator color is light brown; black carbon deposits or oil indicate engine problems.
  8. Check the new plugs for the factory gap of 1.1 mm (do not adjust it, since the iridium electrode is easily damaged).
  9. Thread the new plugs in by hand until snug (to avoid cross-threading), then tighten with a torque wrench to 25 N·m (18 lb-ft).
  10. Install the ignition coils into the wells, tighten the mounting bolts (10-12 N·m (7-9 lb-ft)), and connect the connectors until they click.
  11. Install the decorative engine cover, start the engine, and check that it runs smoothly at idle.

Common mistakes and warnings

  • Do not apply copper grease or anti-seize compound to the spark plug threads. It alters the torque calibration and can lead to over- or under-tightening. The plugs come with a factory thread coating. Do not adjust the gap on iridium plugs, since the thin electrode is easily broken. If dirt gets into a well, do not blow it out with air while a plug is installed (the dirt will enter the combustion chamber). Blow out the empty well first, before installing the plug.