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[Excavator]

Double check that glow plugs are with in spec and working and if all are good then you MAY have injector poppet valve ware and the cold oil will not let the poppet seats seal untill after a few minutes of warm up time.

This can be checked by using a feeler gauge to measure armature plate clearance on cold injector. If you want to further look at this let me know and I will give you more details on how to measure armature plate spec. The injectors can stay in engine but it involves pulling off valve covers and the removing the solenoids on top of each injector and using a feeler gauge to measure the gap between armature plate and injector base. I had the same problem on my black F250 and the engine would not start. I bought this truck as NON RUNNING from Ford lot and then I did all the basics such as glow plugs, relay,UVC gaskets and harness's and still had NO START. Dave over at SWAMP DIESEL PERFORMANCE educated me on the poppet seat problem on high milage injectors and showed me how to check the clearance on the armature plate. I had 5 injectors fail the spec and I elected to go with Swamps Performance BABY SWAMPS Injectors. Never looked back You should plug in the block heater one night and if it starts right up then you should look at the problem being the poppet seats only after you are 100% sure glow plugs and relay are good