Repair procedures: Cleaning

The combustion temporarily becomes unstable, due to the aged fuel and the carbon deposits accumulated on the spark plug(s) after long-term storage.

[1st Method]

1. Start the engine and keep the engine running at idle for 2 minutes.
2. Step on the accelerator pedal and hold it steady at 4500 rpm with the shift lever in N position to warm up the engine until the temperature of the engine coolant reaches 80°C.
3. Keep the engine running at 2500~3000 rpm in the N position for 15 minutes.
   Fig 1: Identifying Engine Coolant Temperature Graph

   Courtesy of KIA MOTORS AMERICA, INC.

[2nd Method]

NOTE:

The 2nd method should be performed only if the 1st method fails (the misfire-related codes recur).

1. Start the engine and keep the engine running at idle for 2 minutes.
2. Drive the vehicle for over 20 minutes, keeping the engine speed above 3500 rpm.
   NOTE:

   If equipped with manual transaxle, shift the gear properly for keeping the engine speed above 3500 rpm.

   Fig 2: Engine Speed Time Graph

   Courtesy of KIA MOTORS AMERICA, INC.