Kia Optima: Ignition System / Spark Plug
Description and operation
A spark plug is a device for delivering electric current from an ignition system
to the combustion chamber of a spark-ignition engine to ignite the compressed fuel/air
mixture therein by means of an electric spark, while containing combustion pressure
within the engine. A spark plug has a metal threaded shell, electrically isolated
from a central electrode by a porcelain insulator.
Specifications
Item
|
Specification
|
Type
|
UNLEADED
|
SILZKR7B11
|
LEADED
|
SILZKR7B8
|
Gap
|
UNLEADED
|
1.0 - 1.1 mm
(0.0393 - 0.0433 in.)
|
LEADED
|
0.7 - 0.8 mm
(0.0275 - 0.0314 in.)
|
Repair procedures
| 1. |
Accelerate the engine to about 3,000 rpm 3 times or more.
|
| 2. |
Remove the spark plug.
|
| 3. |
Check the spark plug visually.
If the electrode is dry, the spark plug is normal.
If the electrode is wet, check the damage and electrode gap as below.
|
| 1. |
Check the spark plug for any damage on its thread and insulator.
If there is damage, replace the spark plug.
|
| 2. |
Check the electrode. Measure the insulation resistance with an ohmmeter.
If the resistance is less than the specified value, adjust the electrode
gap.
|
Specification : 10 MΩ or more
|
|
| 3. |
Check the spark plug electrode gap.
If the gap is greater than the maximum, replace the spark plug.
|
Specification : 1.0 - 1.1 mm ( 0.0394 - 0.0433 in.)
|
| •
|
If adjusting the gap of a new spark plug, bend only the
base of the ground electrode. Do not touch the tip.
Never attempt to adjust the gap on a used plug.
|
|
|
The combustion temporarily becomes unstable, due to the aged fuel and the carbon
deposits accumulated on the spark plug(s) after long-term storage.
| 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.
|
| • |
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.
| •
|
If equipped with manual transaxle, shift the gear properly
for keeping the engine speed above 3500 rpm.
|
|
|
| 1. |
Remove the ignition coil.
(Refer to Ignition System - "Ignition Coil")
|
| 2. |
Using a spark plug wrench, remove the spark plug (A).
|
Tightening torque :
14.7 - 24.5 N.m (1.5 - 2.5 kgf.m, 10.9 - 18.0 Ib-ft)
|
| •
|
Be careful that no contaminates enter into spark plug
holes.
|
|
|
| 1. |
Install in the reverse order of removal.
|
Description and operation
Description
An ignition coil is an induction coil in an engine's ignition system which transforms
the battery's low voltage to the high voltage needed ...
Components and components location
Components
① ECM
② Battery
③ Alternator
④ Starter
⑤ Instrument Cluster
⑥ Ignition switch or start/stop button
⑦ Battery s ...
Other information:
Components and components location
Components
1. Lumbar support motor
2. Reclining motor
3. Front height motor
4. Rear height motor
5. Slide motor
Repair procedures
Inspection
1.
Disconnect the negative batt ...
Repair procedures
Removal and Installation
Engine Room Under Cover
1.
Remove the engine room under cover (A).
Tightening torque:
7.8 - 11.8 N•m (0.8 - 1.2 kgf•m, 5.8 - 8.7 lb•ft)
2.
Instal ...
Ignition Coil
Charging System