This week, Tom and Ray help a gumshoe solve his mechanical mystery. California Ken wonders how to keep the ash from a wildfire out of his engine. A sympathetic listener shares his best “two-hat” cure for Ray’s common cold, and the show cooks up an international flavor - at the expense of East German engineers. These, a black box in Michelle's car, and plenty more dubious and not-so-dubious answers, in this week's edition of Car Talk.