K kingme50000 New Member Sep 8, 2010 26 0 1 Dec 26, 2010 #1 Dec 26, 2010 #1 Yesterday I was driving my mustang with no music and when it was idling at the red light. It sounds like one of those diesel super duty pick up trucks. Does any one know what this problem may be because this car was usually quiet at idle?
Yesterday I was driving my mustang with no music and when it was idling at the red light. It sounds like one of those diesel super duty pick up trucks. Does any one know what this problem may be because this car was usually quiet at idle?
wmburns SN Certified Technician Aug 14, 2009 5,892 514 204 Houston Texas Dec 26, 2010 #2 Dec 26, 2010 #2 Check for a spark plug backing out. Re-torque to factory specs.