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Autopapyrus · Hyundai Elantra 1.6 G4ED (2006)
https://autopapyrus.com/guides/hyundai/elantra/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.

Hyundai Elantra 1.6 G4ED (2006): Spark Plug Replacement

On the G4ED engine, spark plugs should be replaced every 30,000-40,000 km (about 18,000-25,000 miles), or sooner if the engine runs unevenly, misfires, or fuel consumption increases. The procedure is simple and requires no special skills.

Difficulty: Easy Time: 30 minutes Steps: 10 Tools: 10 mm wrench, 16 mm spark plug socket (long), torque wrench, rag

Part

  • 🔩 NGK BKR5ES-11 spark plugs (OE Hyundai 18814-11051 or equivalents from NGK, Denso)
There's a full repair manual for this car Every system, wiring diagrams and torque specs — not just this job. Haynes and 5 more. See manuals →

Step by step

10 steps
  1. Shut off the engine and let it cool for at least 30 minutes. Open the hood.
  2. Remove the engine cover. It is held by 4 bolts (10 mm).
  3. Disconnect the ignition coil connectors (4 total). Press the locking tab and pull upward. There's no need to label them, since the connectors are numbered.
  4. Remove the ignition coil mounting bolts (10 mm) and pull the coils out of the spark plug wells.
  5. Wipe the area around the spark plug wells so dirt doesn't fall into the cylinders.
  6. Use the 16 mm spark plug socket to remove the old plugs. Inspect the electrodes. Black carbon deposits or oil indicate engine problems.
  7. Check the gap of the new plugs with a feeler gauge. It should be 1.1 mm. If necessary, bend the ground electrode slightly.
  8. Thread the new plugs in by hand until snug (to avoid cross-threading the aluminum head), then tighten with a torque wrench to 28-30 N·m (21-22 lb-ft).
  9. Reinstall the ignition coils, tighten the bolts, and reconnect the connectors.
  10. Reinstall the engine cover.

Common mistakes and warnings

  • Do not drop the spark plugs, as an impact can alter the electrode gap. Do not overtighten the plugs, because threads in an aluminum head strip easily. Use a magnetic socket or adapter for safe installation. Do not mix up BKR5ES and BKR5ES-11 plugs. They have different gaps, and the wrong one will cause a lean mixture and increased fuel consumption.