2007-2008 Mustang TSB 09-9-7 1

COLD START FEAD HOOT—WHISTLE NOISE

  1. Noobz347
    Some 2007-2008 F-150, Mustang vehicles equipped
    with a 4.6L and 5.4L engine; 2007-2008 Mark LT,
    Expedition, Navigator vehicles equipped with a 5.4L
    engine; Explorer, Mountaineer, Explorer Sport Trac
    vehicles with 4.6L engine may exhibit a front end
    accessory drive (FEAD) related high-pitched metallic
    whistle/hoot noise after a cold soak in ambient
    temperatures below 40 °F (4.4 °C). This noise may
    be caused by the grooved nylon FEAD idler pulley