Nissan Infiniti V6 3.5L Spark Plug Replacement

This tutorial provides instructions on replacing the spark plugs on a Nissan. This guide applies to the V6 cylinder, 3.5L engine.

What you will need

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• Nissan Spark Plugs
• Spark Plug Socket
• Mechanic Tool Set Metric
• Torque wrench
• Gloves
• Ratchet

Procedure

1. Park the Nissan on level ground. Turn off the ignition and set the parking brakes.
   
2. Allow your engine to cool down for at least thirty minutes.
   
3. Pull the hood release on your Nissan and open the hood.
   
4. Locate the battery in the engine bay. Disconnect the negative battery terminal. 
   
   
5. Remove the 10mm bolts on top of the engine cover. Remove the engine cover. If no bolts are present, the cover can be removed simply by lifting it.
   
6. Remove Ignition Coils. Unplug the electrical connector from the ignition coil. Press the small tab, then pull. Do this for all three front coils.
   
7. Remove the 10mm bolts that secure the coil in place. Pull the coils out.
   
8. This engine also has three coils hidden under the intake manifold. Remove the intake manifold by removing the 10mm bolts to replace those spark plugs. Disconnect the air intake from the manifold. Remove any hoses and pull out the intake manifold.
   
9. Use the spark plug socket, extension, and ratchet to remove the spark plugs from your Nissan. Use a magnetic pickup tool to pull out the spark plugs.
   
10. Install new spark plugs. Use anti-seize on the spark plug threads. Install new spark plugs by hand on your Nissan until they are finger-tight. Then, use a ratchet to tighten an additional 1/4-1/2 turn. Ideally, use a torque wrench to tighten the spark plugs. Typical torque values are 10 to 15 lb-ft for 14mm threads and 15 to 20 lb-ft for 18mm plugs. Standard spark plugs should be gapped to 0.043.
    
11. Install Ignition Coils—reinstall them firmly on the spark plug. Tighten the 10mm bolt.
    
    
12. Ensure the connectors are not mixed, as they must be in the same coil before removal.
    
13. Start the car.  Reinstall the engine cover. Reconnect the negative battery terminal. Remove any tools from the engine bay and start the car. 
    
    

Torque Specifications

Typical torque values are 10 to 15 lb-ft for 14mm threads and 15 to 20 lb-ft for 18mm plugs. Standard spark plugs should be gapped to 0.043.

Spark Plug Gap

• Typical Gap: 0.043

Most spark plugs come pre-gapped and do not require gapping. Check your owner’s manual.

Recommended Interval

Nissan recommends that you replace the spark plugs every 105,000 miles. This recommendation can vary if you have iridium, platinum, or standard spark plugs.

What if I don’t replace my Nissan spark plugs on time?

This list of issues you may notice if you don’t replace the spark plugs at the recommended interval.

• Check Engine Light On
• Fault Codes: P0300 P0301 P0302 P0303 P0304 P0305 P0306
• Engine Misfire
• Poor Fuel Economy
• Engine Shaking

Check Engine Light Still On

If the check engine light is still on after you replace your vehicle’s spark plugs, you can use the YOUCANIC Full System Scanner to clear the stored codes. This scanner can also read and clear fault codes on every control module of your Nissan.

We hope you find the Nissan Infiniti V6 3.5L Spark Plug Replacement guide helpful. Check these troubleshooting and repair guides for more help on your Nissan.