common issue affecting the 3.5-liter EcoBoost engine, particularly in models from earlier production years. This noise typically occurs during cold starts and is caused by wear or malfunction in the variable camshaft timing (VCT) phasers.The rattle is most noticeable right after starting the engine, especially after the vehicle has been sitting for a while. It’s often described as a metallic clatter or knocking sound coming from the front of the engine. This condition is generally due to oil pre