Originally Posted by
drpepper
I would ues the motor craft plugs and wires , common misconception is that autolite is not! a replacement for motor craft,if not using the motor craft plugs try the double platinum or the irridum plugs in ngk.
Dude, If I were you, I would do my homework before saying something stupid like that. The Motorcraft plugs used in the Rangers and Explorers are made by Autolite. If you don't believe me, hold the Autolite and Motorcraft plugs side by side. They are identical in all respects other than the color of the ink used to stamp the numbers, and the numbers themselves.
Now I would say that some people a misconception that Autolite is a Motorcraft or Ford company, and this is not the case. Autolite is a Honeywell brand.
I have never heard of anyone using anything other than Autolite/Motorcraft with any degree or repeatable success in these engines. NGK makes a great plug, but the heat range is wrong. This can cause pinging in extreme cases, and results in consistently elevated plug tip temperatures the rest of the time. This directly equates to accelerated wear on the plugs, and it also stresses the rest of the ignition system.