Tools and Materials Needed:
- New spark plugs
- Spark plug wrench or socket with a long extension
- Ratchet
- Gap gauge
- Dielectric grease
Procedure:
1. Turn off the Engine and Allow it to Cool:
- Ensure that the engine is completely cool before starting the task.
2. Disconnect Battery:
- Open the hood and disconnect the negative battery terminal.
3. Locate the Spark Plugs:
- The spark plugs on the Nissan Quest are located at the top of the engine.
4. Remove the Ignition Coils:
- Use a spark plug wrench or a socket with a long extension to loosen and remove the ignition coils (one for each spark plug).
- Set the coils aside in a safe place.
5. Check Spark Plug Gaps:
- Remove the old spark plugs and inspect their condition and gaps.
- Compare the old plugs' gaps with the recommended gap in the vehicle's service manual or as specified on the new spark plug packaging.
- Adjust the gaps if necessary using a gap gauge.
6. Apply Dielectric Grease:
- Apply a thin layer of dielectric grease to the new spark plug threads to prevent corrosion.
7. Install New Spark Plugs:
- Carefully insert the new spark plugs into the spark plug tubes.
- Use the spark plug wrench or socket to tighten the plugs until they are snug.
- Do not overtighten.
8. Reinstall the Ignition Coils:
- Place the ignition coils back onto the spark plugs, gently pressing them down into place.
- Secure the coils with the removed bolts or screws.
9. Reconnect the Battery:
- Reconnect the negative battery terminal.
10. Test Drive:
- Start the engine and let it run for a few minutes.
- Check for any abnormal engine noise, vibrations, or engine performance issues.
Remember, it's important to follow the recommended spark plug replacement intervals specified in your Nissan Quest owner's manual to ensure optimal engine performance.
