Sonata GL V6-2.5L (1999)
3. Check spark plugs for the following:
1. Broken insulator
2. Worn electrode
3. Carbon deposits
4. Damaged or broken gasket
5. Condition of the porcelain insulator at the tip of the spark plug.
4. Check the spark plug gap using a wire gap gauge, and adjust if necessary.
Standard value:
Spark plug gap 1.0-1.1 mm (0.039-0.043 in.)
5. Re-insert the spark plug and tighten to the specified torque. If it is overtorqued, damaged to the threaded portion of cylinder head may result.
Tightening torque
Spark plug 20-30 Nm (204-306 kg.cm, 15-21 lb.ft)
NOTE: When replacing the spark plug, should use the genuine parts having resistance.
