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.
Spark Plug Inspection
Reference: SPARK PLUG REMOVAL AND INSTALLATION
- The iridium spark plug has a slender center electrode that is made of a material sensitive to mechanical forces. It may be damaged easily if handled carelessly.
- Do not touch the center electrode of an iridium spark plug. Avoid cleaning it or adjusting its electrode gap.
Check spark plug for the following points:
- Air gap
- Electrode wear
- Carbon deposits
- Insulator damage
If any abnormality is found for iridium spark plug, replace with new spark plug.
If any abnormality is found for nickel spark plug, adjust air gap, clean with spark plug cleaner or replace with new spark plug.
Spark plug air gap "a"
Standard: 1.0 - 1.1 mm (0.039 - 0.043 in.)
Spark plug specification
Iridium type: NGK SILFR6A11
Nickel type: DENSO K16HPR-U11
NO RELATED
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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.