Ford Escape popping sound at engine start, possibly misfiring issue not resolved on Ford Escape

Some 2005 Ford Escape owners report experiencing a popping noise from the air breather alongside a check engine light indicating a misfire in cylinder #2. Despite replacing the ignition coil twice, these owners find that the misfire may be caused by faulty spark plugs, a clogged fuel injector, or a vacuum leak. Additionally, a clicking noise during startup could signal a weak battery, which may complicate starting the engine and trigger the check engine light. The OBD-II trouble code P0316, which points to a misfire at startup, adds to the diagnostic challenge. Furthermore, a flashing check engine light serves as a serious warning of a misfire that could potentially damage the catalytic converter if not addressed promptly. To resolve these issues, it is recommended that owners conduct a thorough diagnostic check, inspecting spark plugs, fuel injectors, vacuum lines, and battery health, and utilize a code reader to analyze error codes for precise troubleshooting.