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.
Repair Procedures: Inspection
[On-Vehicle Inspection]
- Accelerate the engine to about 3, 000 RPM 3 times or more.
- Remove the spark plug.
- 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 shown in illustration below.
[Component Inspection]
- Check the spark plug for any damage on its thread and insulator.
If there is damage, replace the spark plug.
- 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
- Check the spark plug electrode gap.
If the gap is greater than the maximum, replace the spark plug.
Specification: 0.9 ~ 1.0 mm (0.0354 ~ 0.0394 in.)
NOTE:- 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.
- If adjusting the gap of a new spark plug, bend only the base of the ground electrode. Do not touch the tip.
NO RELATED
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
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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.