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They are under the coil packs. On the top of the engine head, you will see a black plastic square with a bolt. Remove the bolt (10mm) and pull the whole piece straight up. The plugs are underneath these. There will be 4 total, one for each plug/cylinder. Unfortunately, only one is easily accessible The intake will have to come off to reach the others.
I found this writeup a little while ago. It is for the 6 cyl engine, but will give you a good idea of what you're looking for. http://www.clubfrontier.org/forums/f23/how-change-spark-plugs-2005-gen-2-frontier-40507/
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How many valves does the 2005 Nissan Frontier have?
The 2005 Nissan Frontier has 16 valves.
How do you change spark Plugs on a 2005 Nissan Pathfinder 4.0 Engine?
This is for the '05 Frontier, but should be what you're looking for. http://www.clubfrontier.org/forums/f23/how-change-spark-plugs-2005-gen-2-frontier-40507/
What kind of transmission does the 2005 Nissan Frontier have?
The 2005 Nissan Frontier has a 5-speed manual.
Is the 2005 Nissan Frontier electric or gas?
The 2005 Nissan Frontier is a gas-powered vehicle.
What size engine does the 2005 Nissan Frontier have?
The 2005 Nissan Frontier has an inline 4 engine.
How long is the 2005 Nissan Frontier?
The 2005 Nissan Frontier is 17 ft. 1.5 in. (205.5 in.) long.
What is the curb weight of the 2005 Nissan Frontier?
The curb weight of the 2005 Nissan Frontier is 3675 lbs..
What is the maximum payload of the 2005 Nissan Frontier?
The maximum payload of the 2005 Nissan Frontier is 1001 lbs..
How tall is the 2005 Nissan Frontier?
The height of the 2005 Nissan Frontier is 5 ft. 8.7 in. (68.7 in.).
What is the cam type of the 2005 Nissan Frontier?
The 2005 Nissan Frontier has double overhead cam (DOHC).
What kind of fuel does the 2005 Nissan Frontier use?
The 2005 Nissan Frontier runs on regular unleaded.
What is the turning circle of the 2005 Nissan Frontier?
The 2005 Nissan Frontier's turning circle is 43.5 ft..
