N14 Injector Code-Adjustment

[68shifter]

Hello. I have a 98' N14 Cpl 2391 and Inj code JV

Spec call for Fast= -.359, Slow= -.365, Nominal= -.362

Right now I am at -.360. Is it beneficial/needed to change it to the slow or nominal spec?
Fighting with black smoke and a what I think is a fuel knock only between 1500-1800rpm under load. Rebuilt engine, major out of frame with counterbores, new cam etc. Everything is correct for CPL and ESN. Swapped ECM's with a spare I have and no different. New fuel/filters etc.

I put same gasket thickness on each follower box as what came out, but I am sure this motor was into before.
Thank you.

[Rawze]

(this is just my own opinion)...

A person would be hard pressed to find injectors that were not leaky, even certified re-mans, any more that were worth much of anything on that model engine these days.

Also, how do you know its injectors?.. it could be a boost or fuel-air-mix issue just the same.

- I know that some people still try to push those old engines down the roads, but in all reality, old engines like that should be in a museum, or in a collectors truck that does not drive very often, or perhaps used an old RV ... and not hauling any freight on a daily basis due to lack of quality/reliable parts (especially injectors etc.) for them any more. Most people do not get more than a couple three years out of injectors, even when they are good, before they start to act up due to them being re-wokred to death.