Two problems related to timing tensioner have been reported for the 2017 Ford F-150. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2017 Ford F-150 based on all problems reported for the 2017 F-150.
At cold start, the vehicle makes a very loud rattling noise. Most likely the timing chain and tensioners which Ford is very much aware of on these ecoboost engines.
Rattle on start up. This truck sat for a couple of hours to over night and the engine sounded like a diesel for between 15 and 30 seconds. This seems to be a common issue with the truck engine the 3. 5l ecoboost. A google search shows this is a very common issue and requires the engine to be torn down. The common problem seems to be the timing chain and timing chain tensioners. Ford corp was absolutely worthless in supporting this repair. The dealer was absolutely wonderful. My truck was taken to the dealer on may 13 and I might get it August 16 or 17. Parts were ordered on may 15 and estimated delivery was July 31. That's unsatisfactory! Ford did not have any parts as there are so many engines being repaird for this issue.