Why you blowing black smoke out one side of your dual exhaust?

Blowing black smoke from one side of a dual exhaust typically indicates an issue with the engine's air-fuel mixture, often suggesting it's running too rich, meaning there’s too much fuel and not enough air for combustion. This can be caused by a malfunctioning fuel injector, a clogged air filter, or problems with the engine's sensors, such as the mass airflow sensor or oxygen sensors. Additionally, it may point to issues with the ignition system, like faulty spark plugs. It's advisable to have the vehicle checked by a mechanic to diagnose and resolve the issue.