Quote Originally Posted by mjboudreaux77 View Post
I have only seen white smoke in the case of a bad head gasket - twice. The first time, there was noticeable amounts of oil in the coolant tank. The second, there was no noticeable amount of oil or coolant loss - as the crack was hairline.

Best way to tell is inspect your sparkplugs. Here is a good website that leads you in certain directions depending on what you see when you pull the plug:

It doesn't smoke all the time, it only smokes after I get done driving when its idling.