Vehicles using FUJB Sigma Duratec engine list:

Engine FUJB Sigma Duratec commonly faces issues like intake manifold gasket leaks, causing rough idling and coolant loss. Diagnose by checking for coolant puddles or a sweet smell. Prevent with regular gasket inspections and timely replacement. Another problem is the throttle body buildup, leading to poor throttle response; clean it periodically using throttle body cleaner. Timing chain tensioner wear can cause rattling noises; early diagnosis involves listening for unusual engine sounds at startup. Replace the tensioner promptly to avoid severe engine damage. Regular oil changes with quality oil help prevent premature wear and maintain engine health in the Ford Fusion 1.25 16V.