Last post for this past owner. Timing chain never made a sound or ran rough till on the way to last mechanic for quote on changing out chain. Started running rough when dropped it off. Shop hooked up to their computer, now showed P0016 & P0018 codes. Diagnosed with timing chain stretched & jumped teeth. Recommend replacing engine. Best I found was used engine & install, $5,500.00. Had to borrow against Home Equity to write check to bank to get the title. Sold beautiful 2012 Lincoln MKS for $3,000.00.
Most Unfortunate.
Good luck all you with the Ford 3.5 ecoboost engine. After lots of research, way too many of these engines having this same problem. Ford service told me Ford knows it has a problem, fixed it for the 2017 model.
Out