Can a Diesel (tractor) start without any Glow Plugs, Intake Air heating? My friend has a Kubota Diesel tractor that won't start. He says that it doesn't have glowplugs or any intake manifold preheat. I was astonished. He also says his Caterpiller does the same thing, just fires off compression. I know automotive and emergency generator diesels pretty well, but agricultural diesels are a new thing to me. Request info and feedback.