In reference to below post. When I got my 7.3 a friend of mine told me make sure you wait for the glow plug light to go out before you start the truck, or you will damage the glow plugs,, true or not i dont know. But I have always done that and have never had any glow plug, or injector problems. After reading the below post about bad glow plugs may be the culprit, and the wire harness on the valve covers, do you need the glow plugs to start it?? I have 2 ford tractors, one has no glow plugs, and I don't think the intake manifold heater works, in winter I plug in block heater and tractor starts right up, my other tractor has both glow plugs and block heater, I use both in winter, so why wouldn't a power stroke start without glow plugs?? Just a thought..