Kia Optima Hybrid Owner's Manual Quiz
Engine Electrical System

Repair Procedures

In this manual: Engine Electrical System
General Information — 4Engine Mechanical System — 50Engine Electrical System — 20Emission Control System — 30Engine Control System/Fuel System — 84Automatic Transmission — 98Drive Shaft and Axle — 15Suspension System — 36Steering — 12Restraints — 50Brake System — 38Body (Interior and Exterior) — 54Body Electrical System — 233Heating, Ventilation, and Air Conditioning — 57
18steps
~108min
4/5difficulty
010203040505.94N·mlb·ft
Tightening torque found on this page
Done 0 of 18

Inspection on Vehicle

spark test

  1. Disconnect the ignition coil connectors (A).
    When disconnecting the ignition coil connector, pull out the lock pin (A), then pull out the connector while pressing the clip (B).
  2. Remove the ignition coils (A).
  3. Disconnect the injector connectors (A).
  4. Using a spark plug socket, remove the spark plug.
  5. Install the spark plug onto the ignition coil.
  6. Ground the spark plug to the engine.
  7. Check whether a spark occurs while cranking the engine.
    To prevent fuel injection from the injectors during engine cranking, disconnect the injector connectors. Crank the engine for no more than 5-10 seconds.
  8. Inspect all spark plugs.
  9. Using a spark plug socket, install the spark plug.
  10. Connect the injector connectors.
  11. Install the ignition coils.

    Tightening torque: 3.9 ~ 5.9 N·m

  12. Connect the ignition coil connectors.
  13. Disconnect the ignition coil connectors (A).
    When disconnecting the ignition coil connector, pull out the lock pin (A), then pull out the connector while pressing the clip (B).
  14. Remove the ignition coils (A).

    Tightening torque: 3.9 ~ 5.9 N·m

  15. Using a spark plug socket, remove the spark plug.
    Be careful that no contaminants enter through the spark plug holes.
  16. Inspect the electrodes (A) and the ceramic insulator (B).
    Electrode Inspection
    Condition Dark deposits White deposits
    Description
    • Fuel mixture too rich
    • Low intake air volume
    • Fuel mixture too lean
    • Advanced ignition timing
    • Insufficient spark plug tightening torque
  17. Check the electrode gap (A).

    Standard value: 1.0 ~ 1.1 mm (0.0394 ~ 0.0433 in.)

  18. Measure the primary coil resistance between terminals (+) and (-).

    Standard value: 0.62 Ω ± 10%

Inspect the spark plug / Inspect the ignition coil

Test yourself

A quick Kia Optima Hybrid Owner's Manual quiz: every answer comes with an explanation and a link to the manual page.