Spark plugs that haven't been changed for a long time can become one with the cylinder head. Fortunately, it's possible to repair damaged threads instead of scrapping the head. (Photograph by Chris ...

Last night, my 2001 Volkswagen Jetta was in perfect working order when I parked it at the movie theater. When I came out two hours later and started the car, I heard a “pop” sound, and the engine ...