Inspect Spark Plug

Using a spark plug socket, remove the spark plug.
CAUTION: Be careful that no contaminants enter through the spark plug holes.

Inspect the electrodes (A) and ceramic insulator (B).

Fig 1: Identifying Electrodes And Ceramic Insulator

Courtesy of HYUNDAI MOTOR AMERICA

INSPECTION OF ELECTRODES

Condition	Dark deposits	White deposits
Description	Fuel mixture too rich Low air intake	Fuel mixture too lean Advanced ignition timing Insufficient plug tightening torque

Check the electrode gap (A).
Standard: 1.0 ~ 1.1 mm (0.0394 ~ 0.0433 in.)

Fig 2: Checking Electrode Gap
Courtesy of HYUNDAI MOTOR AMERICA