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5.0L (1979-1995) MustangTechnical discussions on 5.0 Liter Mustangs within. This does not include the 5.0 from the 2011 Mustang GT. That information is in the 2005-1011 section.
Engine not up to operating temperature will set code during run tesr. 314 is air injection system. Go into continious monitor see if tab tad solenoids are switching vacum to diverter valve.
