Your car couldn't run without them. Check out this article from Howstuffworks.com to see how sparkplugs put the ignition in your car: bit.ly/RABZZv
"Basically, this is what happens: The spark plug sits at the top of the cylinder head. The piston first travels down the cylinder, drawing in a mixture of fuel and air. The piston then goes back up toward the spark plug, compressing the mixture. At the very last second, when the piston is at its fullest reach or top dead center (TDC), the spark plug sparks and ignites the mixture. The piston is forced back down to create power for the vehicle, then pushed back up again to clear out the exhaust. At that point, the process starts all over again.
A four-cylinder car will have four spark plugs; a six-cylinder car will have six and so on (though a HEMI engine has two plugs per cylinder). Now that we've got the basics down, let's talk about the kinds of spark plugs on the shelves at your local parts shop."
Courtesy of Howstuffworks.com
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