2009 GMC Acadia Loss of Power and P0430 Code: Cat Converter Clogged and Acceleration Issues
My 2009 GMC Acadia has been displaying a P0430 diagnostic trouble code, indicating a catalytic converter issue. I replaced the cat converter as it was clogged, but the vehicle still exhibits poor acceleration and a noticeable bogging sensation when accelerating. The breather box is now making a noise that seems to correlate with the performance problem. Any insights into potential root causes? Thanks in advance for your help.
First, confirm the catalytic converter has been properly replaced. Check if there are any additional diagnostic codes or symptoms. Use an OBD2 scanner to monitor key sensors such as ECT (Engine Coolant Temperature), MAF (Mass Air Flow), MAP (Manifold Absolute Pressure), and fuel trim values. Then observe the oxygen sensor readings before and after the catalytic converter to identify any abnormalities in exhaust flow or emissions.