99 mustang gt humming noise

Mustang, Taurus, Tempo and Cougar. Town Car, Mercury and Escort.
Ask our auto mechanics for help to all your Ford car questions.
tomdor
Posts: 1
Joined: Mon Oct 28, 2013 7:46 pm

99 mustang gt humming noise

Unread post by tomdor » Mon Oct 28, 2013 7:59 pm

Humming noise, fairly loud, coming from air cleaner housing. Don't know where it is originating from. Cleaned the housing and installed new air filter housing to no avail. Recently installed tps and isp due to inability of car to hold idle. Presently holds idle, but when humming noise is present is only about 300 rpm. Hums most all the time, even before engine has warmed.

User avatar
carriedi
Posts: 2573
Joined: Wed Apr 10, 2013 12:42 pm

Re: 99 mustang gt humming noise

Unread post by carriedi » Tue Oct 29, 2013 10:13 am

try unplugging your iac valve. you might have to hold the idle up just a little bit when you unplug it or the car might stall. Sometimes the iac will vibrate and sound like a fog horn at idle. It will still operate but big noise at idle. Off idle it should go away.
Browse "SIMILAR TOPICS" At The Bottom Of This Page.

  • Similar Topics
    Replies
    Views
    Last post