I gotta say reading this thread and another recent one here on crankshaft piston knock those EB motors scare the hell outta me.
Well, there was over a million sold by 2016, and they’re generally considered solid engines. I’m very disappointed that mine is one of the outliers.
I’ll say that I’ve owned a lot of different Ford engines over the years and the 3.5 Ecoboost is definitely in the top 3 for favorites. No two of the same mass produced engines are exactly the same. They vary from different tolerances on numerous parts throughout the engine. Every now and then you get a bad one that has issues. One of my worst Ford engines I ever owned was a 88 EFI 302 roller cam Windsor. Had I not known better I would’ve said those engines were junk from my experience with mine, but that mill is arguably one of the best engines Ford has ever built according to many. I had two different 351M engines and a 400M that I loved over that 302W, and the M engines weren’t exactly one of Fords best. So it’s hard to really judge by a handful of bad ones, and when people aren’t having trouble with their Ecoboost’s they aren’t really advertising it on forums. Oh by the way, my top 3 are my old Boss 351 and other 2v Cleveland’s, my 4v 390 FE, and the 3.5 Ecoboost. My old 300 straight 6 probably comes in 4th just because of durability not performance. My 2 cents. Actually I should mention my 5.4 2v as being a solid performer and durable also....tied for 4th.It doesn’t matter how many they sell if yours experiences all the common failures.
This forum is full of threads about EB problems.