Infiniti QX30 Replace Spark Plugs and Engine Air Filter

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Despite only having 45k miles on them, they don't look great. I think Mercedes/Infiniti knew what they were doing when they picked the maintenance interval for this procedure. Here's the OEM spark plug next to the replacement.

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Use the 14mm spark plug socket and appropriate ratchet with extension or t-handle to screw the replacement spark plug into its bore. Be careful not to impact the tip of the spark plug. Be careful not to chip the ceramic insulator of the spark plug. Be careful to seat the spark plug properly and ensure the threads engage smmothly. You do not want to cross-thread a spark plug!

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Once the spark plug has been seated and hand tightened, use a torque wrench set to 17 ft-lbs (204 in-lbs) to tighen the spark plug.

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Reattach the ignition coil and use a torque wrench to tighten the ignition coil bolts to 80 in-lbs.

Repeat this process for the remaining three cylinders.

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Before putting everything back together, use this opportunity to replace the engine air filter. I like to vacuum out the lower air box, as well.

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Installation of the remaining parts is the opposite of removal. When screwing the upper air intake lid to the lower air intake box, make sure you have aligned the two halves correctly. It's easy to strip the lower air box, so screw the airbox together carefully. It only needs to be tight enough to make a good seal. Don't yank on it like a gorilla.

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When you're done, it should look exactly like it did before you started.

from:  https://www.infinitiqx30.org/threads/how-to-replace-spark-plugs-and-engine-air-filter-45k-maintenance.26429/