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QUOTE=MGD;1233404]This was an issue on 11-14 3.5 ecoboost engines and Ford issued a few TSBs to fix. The problem was that while driving, the ambient air and the intercooler air were so drastically different (intercooler worked very well) that moisture formed inside while driving. When the driver needed to accelerate quickly and get into boost, the water was forced through blowing out spark. Ford had so many complaints that the government got involved and ford added intercooler blockoff plates and changed the computer tune. They found this was not a true solution, and it seems they are still working it out. There are some reports of this on the 15+ Ecoboost, but not as common.
Since the Ford design/fix was not fully solving the problem, owners drilled a small 1/16” weep hole which evacuated the crap inside the intercooler on acceleration. This fixed the problem every time and became a staple for owners. I think this fix was devised in 2013/2014 and is well known. Skeptics can’t believe anyone would want to create a boost leak, but it was proven to be a very, very minimal boost leak. It never caused any mechanical or performance problems. For these new trucks, I would not drill the weep hole - force ford to fix any misfire or acceleration shudder/vibration.[/QUOTE]