3.5 EcoBoost Cold-Start Rattle: Timing Chain or Cam Phasers? (2011-2020 F-150)
That 2-5 second rattle when your 3.5 EcoBoost F-150 starts cold? Here’s what Ford’s bulletins say for 2011-2015 trucks (chain plus phasers) vs 2017-2020 trucks (phasers plus a PCM update), why the years split, and what to check before you buy.