If you are running the original coils, may as well replace those too - they are notoriuos for failing. The coils are about $280 on-line and the plugs about $90. The coils mount atop the plugs.
For the plugs, you will need a a really long socket extension - like 12" or use a couple of them. Basically the three coils on the front are a snap - remove the Nissan logo cover to expose the coils then one bolt and one harness I think to remove. Pull the coils and plugs are underneath deep in the engine. Slide a socket and extension in and take them out - make sure no crap falls in the motor.
The back ones are similar but more difficult to access because of the throttle cables and other hoses. The setup is similar to the fronts but take your time - you may have to relocate a couple of things to get the middle one out if I remember correctly.
6 spark plugs
about every 75000 miles
A diagram of how to change and how many spark plugs are on a 2000 Mercedes e320
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Remove the spark plug wires from your 2000 Chevy Impala spark plugs. Remove the spark plugs with a 5/8 deep well socket by turning the socket to the left. Reverse the process to install the new spark plugs.
50,000 miles.
plugs wires
I changed all spark plugs on 2000 Maxima, should be the same on 2002. Nothing special is needed, you just need various extensions for the spark plug socket and the rachet you are using. 02/26/10 NO - it's not that easy. The intake manifold upper and lower collectors have to be completely removed from the vehicle. The plugs should not need to be replaced until 100k miles. Most shops want $350 to do this job. http://www.nissanhelp.com/diy/maxima/projects/2002-2003_spark_plug_coil_replacement.htm
you have to remve the intake manifold
The spark plugs in a 2000 Nissan Pathfinder should be changed every 100,000 miles. This is a suggestion done by the manufacturer which is Nissan Automobile Company.