Spark Plug Inspection

1. K24A3 engine Inspect the electrodes and ceramic insulator. Burned or worn electrodes may be caused by:
   - | Advanced ignition timing
   - | Loose spark plug
   - | Plug heat range too hot
   - | Insufficient cooling
   Fouled plug may be caused by:
   - | Retarded ignition timing
   - | Oil in combustion chamber
   - | Incorrect spark plug gap
   - | Plug heat range too cold
   - | Excessive idling/low speed running
   - | Clogged air cleaner element
   - | Deteriorated ignition coils

1. Do not adjust the gap (A) of iridium tip plugs; replace the spark plug if the gap is out of specification. Electrode Gap
   Standard (New): | 1.0−1.1 mm (0.039−0.043 in.)

1. Replace the plug at the specified interval or if the center electrode is rounded (A). Use only the spark plugs listed below. Spark Plugs
   IZFR6K11 (NGK)
   SKJ20DR-M11 (DENSO)
Apply a small amount of anti-seize compound to the plug threads, and screw the plugs into the cylinder head, finger-tight. Then torque them to 18 N·m (1.8 kgf·m, 13 lbf·ft). |