Changing Spark Plugs - Nissan Armada Forum: Armada & Infiniti QX56 Forums
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post #1 of 6 (permalink) Old 11-27-2010, 10:32 PM Thread Starter
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Changing Spark Plugs

I just changed the spark plugs in my Armada. I didn't see any detailed How To Guides on the site so went in on my own based on previous spark plug changes. Changing plugs on an Armada is pretty standard. Took me 75 minutes start to finish. I took the engine cover off, but it ended up being unnecessary. All I needed was a 10mm socket to remove the ignitor coils, a spark plug socket, an 8.5" extension, and a 5.5" extension. The passengers side took a bit longer and the 3rd/4th plugs were the most difficult (working front to back). The only hard part was getting leverage to loosen the plugs and after that it was fairly easy. I used the 8.5" extension on the passenger side bank and the 5.5" extension on the driver's side bank.

You basically follow the following steps for each plug:
1 - Remove wiring harness from ignitor coil ( do this by pressin down on the clip where the wires enter the harness and pulling it out)
2 - Remove 10mm bolt that mounts ignitor coil to engine.
3 - Remove spark plug
4 - Install new plug
5 - Re-install ignitor coil with 10mm bolt
6 - Reconnect ignitor coil harness.

The only other think I needed to do was remove a harness from the 1.5" wide conduit on the passenger side. This was done to access the 2 furthest plugs and was as simple as clicking the mount.

I consider my mechanical skills to be average to slightly above but by no means an expert. This is not a difficult or technical job.
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post #2 of 6 (permalink) Old 11-28-2010, 08:22 AM
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My father taught me to always hand tighten without wrench until snug. Then just a tad more with socket + wrench. This avoids cross threading. Also some anti-seize grease is used by some.

Nice to know it is an easy task. The old pathfinder used special tools because the last plug was right against the firewall.

Last edited by ericchile; 11-28-2010 at 08:25 AM.
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post #3 of 6 (permalink) Old 06-04-2016, 05:23 PM
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Cool post, I need to do mine soon. Thanks
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post #4 of 6 (permalink) Old 06-05-2016, 11:02 AM
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great how to write up.. Thanks for posting

2015 Pearl white Platinum 4x4 Gift to my wife..
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post #5 of 6 (permalink) Old 01-15-2017, 04:59 PM
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I was going to do the same exact write up about changing the plugs on my '08 today until I found jb4iu's. The only things I did differently were:
  • Used a 10mm ratcheting wrench as I found it difficult to get the 3rd ignition coil back on the passenger side with my 10mm socket.
  • Used a 3" extension with my 10mm 3/8" socket for a few of the ignition coils which gave me a bit more length on a few that were blocked by wires and what not.
  • I used duct tape to secure my spark plug socket to my 5.5" extension. I learned on the first plug that this was necessary or my extension wouldn't pull my socket out.
  • I followed the Nissan service manual instructions to tighten the plugs to 18 foot-pounds.

I, too, consider my mechanical skills to be average to slightly above but by no means an expert. This was not a difficult or technical job for me either.

Last edited by FuGeR; 01-15-2017 at 05:02 PM.
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post #6 of 6 (permalink) Old 02-06-2017, 10:32 AM
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Update: since the spark plug change, my fuel economy went from 11MPG to 17MPG. That is all. Just sharing further proof of spark plug importance.
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