Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
2008 Kia Optima V6-2.7LFACTORY OEM SERVICE PROCEDURE
Spark Plug: Service and Repair
REPLACEMENT
SPARK PLUG
1. Remove the ignition coil connector(A).
2. Remove the ignition coil.
3. Using a spark plug socket, remove the spark plug.
CAUTION:
Be careful that no contaminants enter through the spark plug holes
4. When replacing the spark plug, always use the long reach type spark plug.
(1) Color Marking (Tip)
a. [2.7L]
Unleaded : Yellow Marking
Leaded : Green Marking
(2) Length(Tip-Tip / PT Length)
a. [2.7L]
b. 83.2mm/ 26.5mm
c. Others: The length is different from the specification above.
(3) Part ID
a. [U2.7]
L nleaded : ILFR5B11
Leaded : LFR5A
INSPECT SPARK PLUG
1. Remove the ignition coil connector(A).
2. Remove the ignition coil.
3. Using a spark plug socket, remove the spark plug.
CAUTION:
Be careful that no contaminates enter through the spark plug holes.
4. Inspect the electrodes (A) and ceramic insulator (B).
INSPECTION OF ELECTRODES
5. Check the electrode gap (A).
Standard : 1.0 - 1.1 mm (0.0394 - 0.0433 in.)
SPARK PLUG
1. Remove the ignition coil connector(A).
2. Remove the ignition coil.
3. Using a spark plug socket, remove the spark plug.
CAUTION:
Be careful that no contaminants enter through the spark plug holes
4. When replacing the spark plug, always use the long reach type spark plug.
(1) Color Marking (Tip)
a. [2.7L]
Unleaded : Yellow Marking
Leaded : Green Marking
(2) Length(Tip-Tip / PT Length)
a. [2.7L]
b. 83.2mm/ 26.5mm
c. Others: The length is different from the specification above.
(3) Part ID
a. [U2.7]
L nleaded : ILFR5B11
Leaded : LFR5A
INSPECT SPARK PLUG
1. Remove the ignition coil connector(A).
2. Remove the ignition coil.
3. Using a spark plug socket, remove the spark plug.
CAUTION:
Be careful that no contaminates enter through the spark plug holes.
4. Inspect the electrodes (A) and ceramic insulator (B).
INSPECTION OF ELECTRODES
5. Check the electrode gap (A).
Standard : 1.0 - 1.1 mm (0.0394 - 0.0433 in.)
Factory Service Tools
Use the Manual With the Right Hardware
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.
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