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[Rawze]

(12-26-2018 )earnies2 Wrote:  ... when I accelerate I get a puff of black smoke.
...

a puff of smoke on a demandated truck during sudden acceleration is called turbo lag. All big diesel enignes have some form of turbo lag but with a VG turbo, you can pre-spool the turbo a bit more to reduce it. It is a trade-off though. Pre-spooling turbo takes energy to do so. Slightly more fuel is consumed at idle to keep the turbo pre-spooled. Pre-spooling the turbo to make the low rpm range on the engine more responsive is also harder on the cylinders/liners if there is sudden high demand.

It can also be lessened by reducing the acceleration rate of the engine or by putting tighter restrictions on allowed fuel-air-mix, but both of those make the engine feel more lagged while the turbo is trying to play catch up to your sudden demands.

Obviously, lower than normal boost pressure for any given reason will cause black smoke too. things like a leaky CAC, weak turbo, out of adjustment sensors, etc.

if you suspect your injectors are leaking, perform an overhead adjustment then do an injector leak test on it.