Kia Optima: Repair 
		procedures - Ignition System - Engine Electrical System - Kia Optima TF 2011-2019 Service ManualKia Optima: Repair procedures

On-vehicle Inspection

Spark Test
1. Disconnect the ignition coil connectors (A).

2. Remove the ignition coils (A).

3. Using a spark plug socket, remove the spark plug.
4. Install the spark plug to the ignition coil.
5. Ground the spark plug to the engine.

6. Check if spark occurs while engine is being cranked.
To prevent fuel being injected from injectors while the engine is being cranked, disconnect the injector connector.

Crank the engine for no more than 5 ~ 10 seconds.

7. Inspect all the spark plugs.
8. Using a spark plug socket, install the spark plug.
9. Install the ignition coil.
10. Reconnect the ignition coil connector.

Inspect Spark Plug

Inspect Spark Plug
1. Disconnect the ignition coil connectors (A).

2. Remove the ignition coils (A).

3. Using a spark plug socket, remove the spark plug.
Be careful that no contaminates enter through the spark plug holes.
4. Inspect the electrodes (A) and ceramic insulator (B).

Inspection Of Electrodes

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

5. Check the electrode gap (A).

Standard

Unleaded : 0.7 ~0.8 mm (0.0276 ~ 0.0315 in.)


Inspect Ignition Coil
1. Measure the primary coil resistance between terminals (+) and (-).


Standard value: 0.62Ω ± 10%

Description and Operation
Description Ignition timing is controlled by the electronic control ignition timing system. The standard reference ignition timing data for the engine operating conditions are preprogrammed in ...

Removal and Installation
1. Disconnect the ignition coil connectors (A). 2. Remove the ignition coils (A). Tightening torque :3.9 ~ 5.9N.m (0.4 ~ 0.6kgf.m, 2. ...

See also:

Good driving practices
Never move the shift lever from P (Park) or N (Neutral) to any other position with the accelerator pedal depressed. Never move the shift lever into P (Park) when the vehicle is in motion. Be ...

Removal
Handle the sensor with care. 1. Remove the tire. (Refer to "Tire Removal") 2. Remove the va ...

Checking the coolant level
WARNING Removing radiator cap Never attempt to remove the radiator cap while the engine is operating or hot. Doing so might lead to cooling system and engine damage. Also, hot ...

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