Most car noises are annoying or abrasive but Sharon's Ford is making a very regular 'come hither' purrr. Will Click and Clack fix this one or help Sharon patent it and make a fortune? Find out on this episode of the Best of Car Talk.Get access to hundreds of episodes in the Car Talk archive when you sign up for Car Talk+ at plus.npr.org/cartalkLearn more about sponsor message choices: podcastchoices.com/adchoicesNPR Privacy Policy