2016 Ford F-150 XLT 2.7 Ecoboost 3.55 Axle
So if I’m hearing that sound just in cold start, the 2.7 uses forged pistons I think, so there’s the answer.Piston slap (not to be confused with detonation or pre-ignition) is most likely to be heard in an engine that has forged pistons or one that was set up with the wrong piston to bore clearance or flat worn out. If they have the wrong clearance they can make noise from the get-go. Which one of these fits the bill? Just sayin'