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slow start and oil gauge dummy light?? Need help
I just bought at 04 f250 with the 6.0 diesel and it's having some issues. It started right up when I went to look at it, but ever since I got it home it usually takes 3 tries of about 10-15 seconds of cranking to start. Then it idles rough for about 5 seconds before idling normal. The oil gauge dummy light is on while cranking, but goes off as soon as it starts. The light comes back on at idle once the truck is warm and goes off again once I touch the accelerator pedal. It drove just fine when I drove it 60 miles home and I've only driven it one other time since I bought it. Running and driving seem fine, but the slow start scares me.
I replaced the oil pressure sensor and changed the oil to 5w40 and a motorcraft filter. I also checked the FICM and get 47.8 volts with the key on and 47.3 when cranking and running. I've been reading about hpop and a few other acronyms that I don't totally understand, but I'm not sure what to do next. Does anyone have any advice about what to try next or what the problem could be?