06 3500 mega cab 6 speed 210k.I have white smoke at start up and it lasts less than 5 minutes. Back story on this truck. About 3 months ago i had a miss and white smoke. I replaced all 6 injectors with brand new along with feeder tubes. Started the thing up and still had the same thing. Tore into it and pulled the head off. #6 piston rings were broken. Top ring came out in 3 pieces and second in 2. Pulled all piston and checked cylinder bore all were good. Rehoned all cylinders and installed new rings and rod bearing. Now i have white smoke and the issue moved from #6 to #1. Just replaced #1 injector and feeder tube again, installed new hp fuel line and injector wiring harness. Still have the same issue. Any help would be great about to sell the truck because of it.

 

who's injectors? sounds like bad injectors!

 

White smoke is typically just the water vapor(at least it is here in montana) , dont worry about injectors until you get a constant haze of smoke coming from your truck at idle and light throttle. White haze will be when youre running and idling, if its hard start and heavy haze at startup you have a leaky injector, as yours are new I wouldnt suspect that. Doe the truck idle smooth? thats the biggest difference between new and worn injectors.