Buick LaCrosse unable to exceed 15mph with high idle noise and disc sound on Buick LaCrosse

Some Buick LaCrosse owners report experiencing high idle noise, which may be caused by issues such as vacuum leaks, spark plug problems, or failing ignition coils. These ignition coil failures can lead to symptoms like check engine lights, poor engine performance, and difficulty starting the vehicle. Additionally, some owners find that their vehicles are unable to exceed 15mph, indicating potential underlying issues with the engine, transmission, or fuel system, including cold start misfires and timing chain problems. Furthermore, reports of a "disc sound" have been linked to various components, such as brake pads, rotors, or wheel bearings, with unusual sounds indicating possible grinding or scraping issues. It is recommended that owners have their vehicles inspected by a qualified mechanic to diagnose and address these issues promptly, as timely repairs can prevent further damage and enhance the vehicle's performance and safety.