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04 f350 SD 6.0
hard or no start when cold, if its plugged in over nite starts right up ? checked glow plugs and module getting right amps. replaced injector. could the egr valve couse the hard start condition? no codes.
The EGR valve could cause a hard start, but you should see a lot of black smoke with it. It is more likely to be the FICM, injectors, or a HPO (high pressure oil) issue (leak or pump).
There is a no-start troubleshooting thread near the top of the list in the Tech Folder.