So i will keep adding until its officailly done 
Mileage of Vehicle this is being done 98,282
Reason for changing plugs is mainly due to preventive maintenance since the car is really only about 2 to 3 yrs old but has alot mileage (been a good car so far no leaks or nothing)
According to labor software it pays 1.7 hrs for a local shop to do this. Since today was Sunday and i don't really work on my Customer cars Sundays i did Decided to do the plugs on my own father's Infiniti.
I say give yourself around 2 hours to do this right and properly (once vehicle is cooled down before you start) and work on one bank at a time so if you start on the left bank finish the left bank before moving onto the right bank, same vice versa (minimizes mistakes)
This write up will use simple tools nothing too fancy since i kinda handicapped myself and used normal tools that anyone can either buy or already have.
After doing this job i would say its not too hard at all just takes time but the rear cylinders on each bank were the hardest and most annoying, i had to get creative with the extensions. I will show which extension combo i used for each cylinder so it makes it easy for you guys, If you got more fancy tools to make the job easy go for it! (i could of done that too but the point of the DIY is so anyone can do it so i did it with the most basic tools minus the cordless ratchet i was using but you can use a regular ratchet i was just making it easier for myself lol)
Tools Needed
{*** i will list the tools for the most part towards the end of the write up stay tuned
***}
Parts Needed
OEM plugs from Infiniti or get them at your local autoparts store but make sure they are NGK Laser Iridium remember no need to gap the plugs either and DONT USE ANTI SEIZE on the threads NGK has a bullentin on their website to not use anti seize on their plugs. Both OEM and these NGK i got from the local auto parts store are the same.. and cheaper since my local infiniti wanted 35 bucks a plug i was like ouch vs the autoparts store being 20 bucks each
2 boxes of these
here is the original plugs that came out the M so you can see the ones i got from the local autoparts store are the same as the original ones
Step 1
Pop open hood once car is cooled
Step 2
Remove the Center Cover (the one with the Infiniti logo)
-This requires to take off the two 10mm bolts on top and pull the cover off (yes it will feel like the cover is stuck if you never have removed it before, just pull it off with some persuasion. Next put some lube, like some sort of grease i used lithium grease, on the pins [These pins are what hold the cover in the front] and also lube where the pins go into so its easier to remove in the future
Cover off
Lube up these pins so its easier in the future
This is where the pins go into (also put some lube there too) light coats nothing crazy
Step 3
Take off the intake tubes off (Very easy)
You will need a 8mm socket (preferably 1/4 ratchet) and loosen the clamps then once you loosen the clamps on the throttle body side and MAF side on both banks you grab your pliers and squeeze the clamps that hold the PCV hose/tube and pull it back to the tube comes out the intake tube.
The PCV hose/tube im talking about each side has one but only took a pic of the left side so you get the idea
Intake tubing removed (COVER MAFS! dont want foreign material inside intake tract)
MAF's covered with clean towels
Step 4 Now it begins (i started with the right bank so i believe i started with Cylinder number 1 bank i.e Driver side), Also when removing the coil packs take them all out and leave them outside the car until all spark plugs have been change then reinstall them from back to the front, it will make it easier on you to have space
(^this is showing you what tool u pretty much need to loosen all the coils, a 10mm socket 1/4 ratchet the fronts are pretty self explanatory but decided to take a picture of cylinder number 7, which is the last one on the right bank since its a tight fit in there)
Cylinder #1 (Very Easy)
i used the longest extension in my arsenal since the front one is very accessable so with a 14mm socket (you can use a regular 14mm socket or a spark plug socket same size) i was able to break loose the plug.
Note if the plugs were never changed it will require a little strength to loosen them since they have they been there since the factory lol
Once you have spark plug loose all the way depending if you are using an actual spark plug 14mm or just a plain 14mm socket
If using a spark plug socket the rubber will hold it and pull the plug out with it
If using a regular 14mm socket like i was use a magnet (The magnet will be your best friend when doing the back plugs nearer the firewall trust me)
Cylinder #3 (second one from the front on right bank) Also pretty Easy to remove
Process is the same as Cylinder 1 just becareful of AC line if using a long extension
As you can tell im taking the coils off in order the more i go down the line u can do it that way or remove them all at once up to you
Magnet doing work lol
Cylinder #5 (A little Tricky)
^Some might say why the swivel portion well i know swivels rob some power when removing stuff but this is why i used it so i can have the extension clear the tab from blocking
Then i used my long extension and my long 3/8 ratchet that has leverage
Cylinder #7 and 8
are pretty much the same (Both are a bit of a pain) So yea not easy but not super hard, probably the hardest part of the whole job was these two. i only took pics on doing number 8 (passenger bank but it will apply to both) Remember when i told you to leave all the coils out until ur Done installing the new plugs well this is where it comes into play.
Extension combo i used on number 8
^I used the bigger Ratchet to break it loose but then switched to the mini to make it easier on ratcheting in a small area
(Side note) when removing the coil on number eight you will need to use a 10mm wrench to loosen the bolt since there is a metal line in the way
Cylinder # 2 (very front on passenger bank) Very Easy and straightforward
Cylinder#4 (Easy once you route the extension under the harness and remove the tiny bracket)
^the little bracket
Cylinder #6 (A little tricky pretty much like number 5 was)
Used same set up as number 5
NOTES for installing new plugs
-At this point you should of already got the hang of it and knew pretty much what your doing. When installing the new plugs you pretty much drop them into the little chamber (the chamber is narrow) and once u put your socket in the spark plug chamber it will center the plug, so then turn the extension by hand (to avoid cross threading) and the plug should start threading and once it gets hard to turn whip out your ratchet and torque them down snug
Put back everything in reverse order and bam Job well done
Give yourself a pat in the back by saying to yourself u saved some money
The M56s with my 500hp Z32 soon to be 700whp Z32 little by little on that one hahaha
Thanks for taking the time to document it.
