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.
2012 Hyundai Equus V8-5.0LFACTORY OEM SERVICE PROCEDURE
Spark Plug: Testing and Inspection
On-vehicle Inspection
Spark test
1. Disconnect the LH/RH ignition coil connectors (A).
2. Remove the LH/RH 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.
NOTE:
Crank the engine for no more than 5 - 10 seconds.
To prevent fuel being injected from injectors while the engine is being cranked, disconnect the injector connector.
6. Inspect all the spark plugs.
7. Using a spark plug socket, install the spark plug.
Tightening torque :
14.7 - 24.5N.m (1.5 - 2.5kgf.m, 10.8 - 18.1lb-ft)
8. Install the ignition coil.
Tightening torque :
9.8 - 11.8N.m (1.0 - 1.2kgf.m, 7.2 - 8.7lb-ft)
9. Reconnect the ignition coil connector.
Inspect Spark Plug
1. Using a spark plug socket, remove the spark plug.
CAUTION:
Be careful that no contaminants enter through the spark plug holes.
2. Inspect the electrodes (A) and ceramic insulator (B).
Inspection Of Electrodes
3. 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.