INFINITI QX4 dark smoke from tailpipe and loss of power possibly due to catalytic converter issues on INFINITI QX4

Some INFINITI QX4 owners report experiencing dark smoke emissions from the tailpipe, which often indicates an improper fuel-air mixture where excess fuel is being burned. This condition can lead to unburnt fuel in the exhaust, resulting in dark smoke. Additionally, these owners have noted a loss of power that may signal underlying engine performance issues, which could potentially be addressed by adjusting the fuel trim. Concerns related to the catalytic converter have also been reported, as it plays a critical role in reducing harmful emissions and can contribute to both dark smoke and power loss. To resolve these issues, many owners recommend seeking a professional inspection from a qualified mechanic to accurately diagnose the cause of the symptoms. Diagnostic testing can help identify specific problems affecting the catalytic converter and engine performance, leading to necessary repairs or replacements to restore proper function and eliminate the dark smoke. Prompt attention to these matters is crucial for effective resolution.