Are you ready to suggest an appropriate course of action when one of your customers brings you a sick vehicle, with an even sicker-sounding engine? Perhaps the engine has lost power or is burning mass quantities of oil. Whatever the problem may be, the vehicle owner will be relying on you to make an accurate diagnosis of the engine’s true state of health. Is it dead, dying, or still alive? Can it be revived without major surgery? And if not, what will the necessary repairs cost?