Orman,
The color of the smoke is helpful here and may take someone following to sort it out. White condensation smoke on start and early warm up is normal if cool outside and should just be ignored. I suspect that you are bringing this up because you have seen black smoke that is unburned fuel, and it would seem like Cat could do something about your engine running fuel rich if it is a constant. The Cat forum may also be helpful if you join and post over there. If Cat tried to get the HP rating of that motor up beyond the original design for motorhome use, they may have pushed the fuel end of things too far, but they have usually been conservative in the past so I do not think that they would have gone to extremes. In my coach I have a later C12 which started out at 410HP and by the end of the C12 run with some piston cooling changes they reached 505HP for some applications like ours. With that increase in HP, they push more fuel, and I have not seen black smoke except rarely if I'm really lugging down RPM wise on a hill and it is still minimal. Different motor but probably a similar injection and ECU monitor system. Cat should be able to tell you if there is a program update for this symptom.
Later Ed
