Hyundai GENESIS COUPE BK 2010 Manual page 196

Inspection Of Electrodes
Condition
Description
5. Check the electrode gap (A).
Standard :
1.0 ~ 1.1 mm (0.0394 ~ 0.0433 in.)
Inspect Ignition Coil
1. Measure the primary coil resistance between terminals (+) and (-).
Standard value: 0.62Ω ± 10%
Dark deposits
- Fuel mixture too rich
- Low air intake
White deposits
- Fuel mixture too lean
- Advanced ignition timing
- Insufficient plug tightening torque