How to remove spark plugs from a 2000 nissa maxima

This is possibly true, especially if you have a 6 cylinder. They don't actually remove the whole intake from the motor, there is a section of the intake system that can be removed fairly easily and then the plugs can be accessed. Unfortunately, this design was more to push the price of a tune up higher than a needed design change, at least in my opinion. Since you have to remove that part most people are more inclined to take a vehicle to the dealer to replace spark plugs instead of doing it themselves and as you know, the dealership prices are higher than anywhere else and the mechanics have the same qualifications other mechanics have.Typically no seals need to be replaced when this is done but it does take more time and that is where the dealership makes it's money.

http://www.ehow.com/how_6523412_replace-spark-plugs-1995-maxima.html
There are the steps to replace the plugs. You shouldn't need to remove the manifold.
Thanks,
Lee

Try this first: change spark plug for that cylinder and replace spark plug wire for same cylinder.

For the 3 spark plugs in front:
1. You would have to remove the plastic protective cover (this cover is silver&red w/ the words "nissan and v6 3000")
2. unplug connector and remove coil (DO NOT mix up the coils, keep the same coils on the same cylinder)
3. Remove spark plug

Rear 3 plugs: located on the rear of the intake (the black pipes atop the engine). there are 3 openings at the rear of the black intake pipes, each opening has a coil mounted.
1. Unplug coil connector and remove coil
2. remove spark plug (you'll need a long extension)
***Installation is reverse, be sure not to over tighten the plugs!! Use anti-seize compound on all the new plugs threading. Hopefully this helps!!

.044 is the spark plug gap

They are under the plastic covers that are in the center of each valve cover, there should be 2 or 4 allen key screws holding the covers on, when u get them loose u will see 3 coil packs under each cover, thease supply the spark for the plugs, u must unplug the wire harness from each one then remove the 2 screws that hold it down, slide it out vertically because there is a long stalk that goes down to the plug, u will need an extention on your rachet to reach the plug. The front 3 are easy and the rears are harder and require some tight space jockying but it is not impossible for someone with moderate mechanical skills. good luck !!!

The rear plugs on this car are relatively easy to change. First locate the electrical connectors on the rear coils and remove them. Next, take a 10mm socket and remove the bolt that hold the coils to the engine block and remove each coil. The last step is to remove each plug and install the new ones. You may need various extensions and such, but it is very do-able and you do not need to remove the air plenum as you do with the 3.5 engine used in 2002.

I had the same problem with my 99 Subaru Forester and it was caused by oil leaking and getting into the spark plugs. We only needed to remove & clean one of the plugs and then we were running smoothly again. Very well could not be what your problem is but it's worth a shot mentioning.

You have to remove the plastic cover on the front bank of cylinders and then remove the 3 ignition modules these are recognized by the three wire connector attached to each one then with an 6 inch extension and spark plug socket remove the plugs . The rear set of plugs is about the same only the ignition coils are not covered once you see what the front ones look like you will be able to do the rear ones with no problem

Enter to nissan web-site, there is a lot of manuals there.