On Thanksgiving Day, I couldn't get Geraldine started-she just cranked, and blew white smoke. Not at all normal behavior. Owing to a busy work schedule, I had to leave her till today, when a friend and I were able to get her started (with considerable difficulty). My friend thought that there were two factors at work-air in the fuel system, and a positive battery cable in less than perfect health. He has experience working on diesels, but not on Mercedes, and he could not say how the air was getting in. I have a suspicion that one of the injectors may be leaking. Is that a likely cause of this kind of trouble? It seems to me that since we got her started, the idle is inordinately rough. Is this another manifestation of air in the system, and/or fuel injector malfunction? Any helpful suggestions will be greatly appreciated.