If you don't know how spark plugs work, you probably also don't know when the best time to change them is. Here's a quick guide on when to change spark plugs and how they work. For more info, check out the About.com article: http://autorepair.about.com/od/regularmaintenance/ss/plugs_replace.htm Watch More How To Videos on our YouTube Channel: http://www.youtube.com/about Watch More How To Videos on About.com: http://video.about.com Connect with About.com on Facebook: http://www.facebook.com/Aboutcom Follow About.com Video on Twitter: http://twitter.com/aboutvideo
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