Repair procedures: Inspection: Notes

Disconnect the spark plug cables from the spark plugs.
NOTE: When removing the spark plug cable, pull on the spark plug cable boot (not the cable), as it may be damaged.
Using a spark plug socket, remove all spark plugs from the cylinder head.
CAUTION: Be careful that no contaminants enter through the spark plug holes.
Check the 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
  
  Fig 1: Checking Spark Plugs
  Courtesy of HYUNDAI MOTOR CO.
Check the spark plug gap using a wire gap (A) gauge, and adjust if necessary.
Standard value: 1.0-1.1 mm (0.039-0.043 in)

Fig 2: Checking Spark Plug Gap Using Wire Gap Gauge
Courtesy of HYUNDAI MOTOR CO.
Re-insert the spark plug and tighten to the specified torque.
If it is over torqued, damage to the threads of the cylinder head may result.

Tightening torque:

20-30 Nm (2.0-3.0 kgf.m, 15-21 lb-ft)