Smoking after inframe

Might be a boost leak. I'd check all the boots and tighten the clamps. Did you replace or at least check the CAC for leaks when it was inframed? They all have traces of oil inside the blowby tube that's normal.

 

Replace air cleaner then mark MI. on tape on outside and keep track of MI. on each filter 50 or 60,000 mi is agood start with 1 air cleaner.

 

What he said about dirty filter too.

 

sounds like they changed your injectors to larger ones

 

A gauge in the cab is nice but if there is a small leak it will still make all the boost in the world but smoke a little and loose horsepower. I know it doesn't make sense most of the time you won't notice the power loss till its fixed.

 

I have a c12. It don't spool below 1200 rpm's and smokes till it spools.

 

had shop put a 6 pack inj in 1 time & set the fuel, where I got better m.p.g. better. h.p. but smoked a lot. 1 inj lasted just til warranty was over. had my local shop replace the one. & reset inj, no more smoke, not another prob with inj, but loss the power increase. inj & fuel setting will cause what you are describing, but the other things posted by others will too. good luck.