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6.0 Rough Start, Now No Start??? FICM???
Hey guys, I'm in a little bit of a dilemma here. I have an 03 6.0 F-250. I'd like to say my problems seem to have started after my last oil change, I switched from Rotella to Delvac. After the oil change, I had alot of chugging after a cold start (by cold I mean 30-65 degrees outside), never had this problem last year, even in sub zero temps.
The other day, drove it to work where it sat overnight about 25 degrees out. Went to start it in the morning, cycled the glowplugs as usual and it kicked over then stalled. Tried it again and it would do the same thing over and over. It was puffing black smoke out the tailpipe when cranked. Came back later on and pushed it inside a garage, plugged it in (for the first time ever), put a space heater under it and after a few attempts it started. It was still running rough up until that point with the Delvac in it.
I figured after that it could very well be the oil and maybe even fuel filters. Today I drained the oil, put the Rotella 1540 back in and changed both fuel filters. After changing the fuel filters I cycled the fuel pump a few times before starting. Once it started there was no change in the way it ran, even put an additive in the fuel in case I got $h!t diesel. Once it hits about 2000RPM, it puffs blue smoke, and there is definitely a noticable miss and lack of power.
A buddy of mine suspects a bad FICM, and reading some of the forums on the net it seems like a distinct possibility. On a side note, I have had a battery light on the dash, however I'm getting between 13 and 14.7 volts at both batteries and the alternator, but I don't know if that could cause a low voltage condition for the FICM not to work. I did test the FICM using a volt meter, I had 47v with the battery off. I had the wife come out and crank the truck over to test the volts while cranked and running. Welp, it wouldn't even start, and I had huge fluctuations in voltage while she cranked it over.
My best guess is the FICM is bad, but its just strange considering all the circumstances and figured someone at there has had to have some experience with it. I don't have access to a scan tool, but when it was stranded at work the other night, I did have access to one and it threw no codes.
Don't want to buy the FICM if I'm not sure its the problem. Thanks in advance guys!