2002 diesel pickup smokes. I have changed the injectors. The smoke is blue. on 2002 Chevrolet Silverado 2500 HD

2002 diesel pickup smokes. I have changed 3 injectors. The smoke is blue.

2 answers 1 comment
Thanks Is that blue smoke after you changrd the Injectors or before ?
After...but was doing it before.. why I change them.
Does the smoke have a "sweet" smell to it?