On the engine head !
You must remove the entire intake manifold for you to have access on the three spark plugs located underneath it. it is advisable that a qualified Mitsubishi technician should do this.
2002 galant , can't find the spark plugs
NGK platinum plugs
The plugs are located under the intake plenum. This is a real job because it takes removing several bolts, wires and gaskets to get to them.
Four.
The spark plugs are located on your head for the first three, when you open your hood and you find the metaling (head) that says 24 valve V6, there are 3 plug type things on there, those are the spark plugs, the last three, are under the plenum.
Six
two spark plugs are located to the right side of the engine and the other two spark plugs are located on the left side of the engine.
Once on 1-2 year on regular spark plugs. Once every there years on High end spark plugs.
All depends on what kind of spark plugs you have. It could either be 30,000 miles or 150,000 miles.
The 2008 Lancer uses a 4 cylinder engine, therefore it uses 4 spark plugs.
Most had a V-6 under the hod, which would mean 6 spark plugs.