Inspect Spark Plug

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

Fig 1: Identifying Electrodes And Ceramic Insulator

Courtesy of KIA MOTORS AMERICA, INC.

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 KIA MOTORS AMERICA, INC.