Changing spark plugs on a 2007 Nissan Frontier QR25DE (2.5 liter, 4 cylinder engine).

Here are some tips for replacing your QR25DE spark plugs.

In order to get at the plugs, you have to remove the intake manifold assembly.  To do that, you must:

Fig. 1 – Remove these 2 nuts and 3 bolts.

Fig. 2 – Remove this bracket.

Fig. 3 – Disconnect the fuel line.

You might as well replace the following parts while you’re in there:

Plugs, valve cover, valve cover gasket, COPs, intake manifold gaskets.

Fig. 1