An engine that runs rough or expels large amounts of black smoke may indicate a misfiring cylinder. Assume that the auxiliary diesel engines on your vessel have a fuel injection system that permits the injectors to be disabled for troubleshooting purposes by loosening the high-pressure fuel injection line fitting at the injector nozzle while the engine is running and noting the engine response. If before the injector is disabled the engine is running rough and expelling large amounts of black smoke, and after the injector is disabled, the engine runs even rougher, but continues to produce equally dense black smoke, what is indicated?

Question

Accepted Answer

This indicates that the cylinder associated with the disabled injector is firing properly, but at least one other injector is misfiring.

Answer

This indicates that the cylinder associated with the disabled injector is firing properly, and all other injectors are firing properly.

Answer

This indicates that the cylinder associated with the disabled injector is misfiring, and at least one other injector is misfiring.

Answer

This indicates that the cylinder associated with the disabled injector is misfiring, but all other injectors are firing properly.