Can dirty injectors cause black smoke on a cummins engine?

Yes, clogged or dirty fuel injectors can cause black smoke on a Cummins engine. When the injectors are dirty, they don't spray fuel properly and the engine will run rich, which will produce black smoke. Other possible causes of black smoke on a Cummins engine include:

* Low air intake: A clogged air filter or restricted air intake can cause the engine to run rich, which will produce black smoke.

* Over-fueling: If the fuel injector pump is delivering too much fuel, the engine will run rich and produce black smoke.

* Faulty turbocharger: A faulty turbocharger can also cause the engine to run rich and produce black smoke.

* Fuel quality: Poor-quality fuel can also cause black smoke on a Cummins engine.

If you see black smoke coming from your Cummins engine, it's important to have it checked out by a qualified technician as soon as possible to identify the cause of the problem and have it repaired.