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:Â SPARK PLUG REMOVAL AND INSTALLATIONÂ
- When service the iridium / platinum spark plugs (slender center electrode type plugs), i.e. IFR5J11, IFR6J11, do not touch the center electrode to avoid damage to it. The electrode is not strong enough against mechanical force as it is slender and its material is not mechanically tough.
- Do not clean or adjust gap for the iridium / platinum spark plugs.
- Electrode wear
- Carbon deposits
- Insulator damage
- Air gap
For iridium / platinum spark plugs, replace them with specified new plugs, if any abnormality is found.
For spark plug other than iridium / platinum, clean, adjust or replace them with specified new plugs, if any abnormality is found.
Spark plug air gapÂ
"a": 1.0 - 1.1 mm (0.040 - 0.043 in.)
Spark plug typeÂ
NGK: BKR5E11 / BKR6E11 / IFR5J11 (iridium / platinum spark plug) / IFR6J11 (iridium / platinum spark plug) DENSO: SK16PR11 / SK20PR11 / K20PR-U11 / K16PR-U11
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.