Need an opinion, puff of blue smoke (lasts for about 15 seconds) each time I start it (regardless if its warm or cold) has been doing it for the last week everytime? 135,000 miles 2006 5.9 never noticed it before, just started doing it. Daily driver that doesn't get beat on. It also runs a little rougher than before when it first starts up but smoothes out after ?????

 

mine does the same thing got my fuel system flushed it helped and i instantly gaind 3 mpg

 

The problem I had was bad injectors, I had them rebuilt by Santee Automotive in Salem, Ohio he does mostly performance diesel work and rebuilds transmissions, he did my trans also with Gorend conv, valve body and input shaft (he sent the injectors out but did all the labor) we also went 60% bigger. since then I have towed our camper from Ohio to Ga. and back and it has been like a NEW truck. I would HIGHLY recommend him if you are in this area!