zx12-iowa

But check the 11-14 forum here. I can't recall it being An issue on the 3.5 Eco. Lots of non eco owners alleging the Eco will fall apart incl carbon build up but I can't remember a thread where it was actually an issue.

However there are a few threads on timing chains stretching. But that's nothing to do with long hwy drives

jtp1984

The guy with the 300k st is in his 50s mostly highway, and I doubt he's doing slowing down then mashing the gas constantly on the highway

V8-Coyote

Idling/lugging especially when engine is cold contributes to carbon.

Catch can and water meth will/may help. WOT at least half a dozen times per tank once engine is nice and hot will help, just don't a few minutes before anticipating to turn the truck off.

jtp1984

http://www.focusst.org/forum/focus-s...how-doing.html
The guys name is midlife st

Truckin

iTrader: (4)

Whatcha sayin bout 50 year olds there son

Heres an 80 yr old guy still drives 2500hp car on 2 wheels
https://youtu.be/LabX19ocJZA

Probity

Hope y'all had a happy 4th! Thanks all for the posts. I knew the EB engine was "different" than my previous F series engines, but in a good way. The carbon thing interests me because (a) I've seen mention of it this forum and others, (b) I was (am) convinced that my driving habits with previous V-8 F series were minimizing chances of this happening (high detergent gas, syn oil changes, etc) even with repeated long trips at relatively low rpm's for extended time periods.


The GDI test info I saw (again, 1 data point, non-Ford) showed intake valve carbon buildup in the GDI engine basically insensitive to detergent gas (detergent didn't reduce it) whereas in the port fuel injected engines (PFI) it did. For combustion chamber carbon, amount of carbon was higher in PFI engine and detergent gas didn't really reduce it either. The biggie for GDI engine carbon buildup was engine load, and by a large factor, and . PCV blowby was not shown to be related to carbon buildup in the GDI engine (not what I would have expected).


So I'll keep looking for info, as I have many miles ahead of me in coming years that will be near a steady 2000 rpm or so. We'll see.

ajsturtz

I drive my EB for work on interstates 90% of the miles. At 127k as of this weekend, and 0 problems with carbon. Never had induction cleaning, no sputtering or other symptoms. I'll keep you updated every 50k miles...

German_truck

After 5+ years of the 3.5 EB in the F150 (and plenty of 2011 F150s now being in the 100k to 150k mile range) - it's safe to say that you won't need to worry about "carbon deposit" issues. If there would be such issues... we would have heard by now about 2011 F150s failing left and right due to carbon build-up...

Just drive your truck and enjoy it.... if you want a PROVEN and old engine design... go buy the 5.7l V8 in the Tundra. However at 18mpg (optimistic) highway you'll spend over the life of the vehicle several thousand $ in additional fuel costs...

or you can install a catch-can system for a few hundred $ in a brand new truck and with some luck void the powertrain warranty (related to the engine) from day 1

jtp1984

Can't void warranty. Be careful not to give false info like this. If it clearly caused a failure they can deny claim on the failure it caused. But there is really little failure it can cause

German_truck

nope. that's not how factory warranty works regarding unauthorized aftermarket modifications...

if there's a possibility (even only 10% likely) that your modification caused the failure... they void your warranty and mark it in your VIN. the ball is in your court then... good luck with that.

they do NOT have to show that the modification clearly caused the failure. the possibility (even remotely) causing the failure is enough...