I had thought I was insane when I first heard the "rattle". Got a good Ford tech and went for a test drive and in 30 seconds turned around and went back. Idler pulley and belt. Back again about a year later. All quiet this year until a little chirp this weekend. I wonder if the belt break in and stretches a minute amount that the idler spring cannot compensate.
Did the Ford tech add the missing pulley or just replace the existing one? Read the last few posts (and watch the video in my last post) for what has been generally accepted to be the long term solution to this problem, if you haven't already.
Bought Pulley and Bolt spent 10 minutes, NO NOISY RATTLE
Following this post Husband and I decided to give it a try, we ordered the Parts from www.fordgenuineautoparts.com, parts arrived in 3 days, $33.00, it took all of 10 minutes for Mark to put the Pulley on. Years of Rattling noise Gone in 10 minutes. Thank you for the Post