How do you change a spark plug?

Without more information about the type of engine, and the vehicle it is in, all you can expect to get is generic information. Generally, with the engine cold. You need to remove the spark plug wire from the plug, twisting while pulling on the "boot" not the wire! Next find the correct spark plug socket,(one that the new spark plug fits into, AND holds the spark plug. Now make sure the place that the old spark plug is screwed into is clean, using compressed air blow out around the old spark plug to keep dirt and sand from falling into the cylinders (scoring/scratching the life out of them!) Using a 3/8" drive rachet, an extention and the spark plug socket, put the socket in the hole that you removed the spark plug wire from and turn the socket counter clockwise until the spark plug is free. Inspect the spark plug for unusual wear, or deposits this could be a sign of engine problems. Take the new spark plug check the gap!! if it is correct place it in the socket and start theading it in the spark plug hole by hand, turning it clockwise. Tighten the plug firmly, but not till all the veins pop out of your face. Reinstall the sparkplug wire you should feel it snap onto the end of the spark plug. Continue on with each of the other spark plugs making sure to always put the exact same wire onto the plug you took it off of.

Note it is a good idea to put a small amount off anti-sieze compound on the threads of the new spark plugs to aid in the installation and removal. Also when reinstalling the spark plug wires use some silicone grease in the boot so that next time the boots will pull off easily.

I hope this is some help. Melvis