2012 Mustang GT Engine ticking, tapping sound. No modifications. 3200 miles. Refer to TSB # 12-8-14 5.0L WITH A/C COMPRESSOR DRIVE STRETCHY BELT CONFIGURATION – LIGHT LOWER-END ENGINE KNOCK if you have this issue. UPDATE OCTOBER 2012: Read the comments below regarding the ticking sound and how a TSB can get it fixed by your local ford dealer. I happened to notice a metallic tapping sound while driving today. It was hot outside, the external temperature reading on the display was 100 degrees. Air conditioning was full blast (not sure if that has anything to do with ticking sound). Posted this video on youtube to get opinions if this is indeed the infamous engine tick from the 5.0 L engines.