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Hi Sharlene, The link below is a youtube video on how to test for a bad coil on a Nissan Maxima motor, The guy shows the firing order at 48 seconds into the video and unfortunately spark plug/coil number 3 is middle at the back... Good luck.......CHEERS.. https://www.youtube.com/watch?v=SZPiD7nv9Bw
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!!
Vacuum leak.Listen for hissing around motor. check spark plugs.Idle positioning sensor. Idle Air Valve. IAC clogged dirty/clean an inspect for air leaks. I have an Nissan 300zx an they are located on back side of engine on driver side. It runs into the Pentium Intake between two 3/4 in rubber hoses/Driverside--Change plugs an wires.
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