My 379 1999' peterbilt truck motor makes a knocking noise but when i disconnect the injector it stops knocking?

500 cummins redtop motorMy 379 1999' peterbilt truck motor makes a knocking noise but when i disconnect the injector it stops knocking?
Replace the injector or if you want to prove its bad you can swap that injector with one of the others. If the knock follows the injector you know its the injector. The first 2 guys are right a bad injector can cause a knock.My 379 1999' peterbilt truck motor makes a knocking noise but when i disconnect the injector it stops knocking?
sounds to me like the injector is bad, running too lean, or too rich, you need to replace the injectorMy 379 1999' peterbilt truck motor makes a knocking noise but when i disconnect the injector it stops knocking?
When an injector tip blows it sounds just like a rod knocking.