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2021 Powerboost Platinum FX4 Kodiak Brown
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There's so many things that it could be. These are pretty sophisticated motors, and they are awesome when operating properly, but any truck with this motor that is beyond the powertrain warranty really needs a thorough shakedown before signing on the dotted line.

I know it's too late, but it would be prudent to find someone who knows these motors specifically and have them do a thorough Pre-purchase Inspection on it. Or at least get the truck up on a lift and give it a thorough look under every nook and cranny with a bright light. Also get a real diagnostic tool hooked to the ODB and pull any and all codes.

The most common issues are all addressable, of course, but a few of them are labor intensive so they can be costly.
 

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Premium Member
2021 Powerboost Platinum FX4 Kodiak Brown
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11,089 Posts
Let's just say that if you are going to take the process of elimination strategy, and considering the history of the 3.5 Ecoboost, AND you are intending to keep the truck anyway, then this would be the first things I would do. (but I would pull those codes no matter what because they just might have some valuable clues)

Fresh plugs gapped about .28
The boots are cheap and you are in there anyway, so boots too
Fresh air filter
Fresh oil and Motorcraft filter
And because it is relatively inexpensive AND a malfunctioning one can cause the craziest symptoms, an oem throttle body. (easy to change too)

Because it is a 2012, I would make sure that you don't have an Intercooler with a big build up of nasty liquid laying in the bottom of it. (either drill a hole in the bottom, or if that makes you queasy pull it and dump it if it has any liquid in it.

You also should take a really patient look around for broken or damaged vacuum lines. Your truck is very dependant on vacuum for a lot of things that affect performance.

Then take it out and get everything good and warm before you roll into a WOT pull.
It would be nice to have some method of monitoring some pids via your ODB port, but you can wait until you verify that the list above made a substantial impact.

You didn't mention any alarming noises, so I'm assuming there wasn't?
 

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Premium Member
2021 Powerboost Platinum FX4 Kodiak Brown
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11,089 Posts
Why 4K rpm? Did it shift? Did it shift when you let up on the throttle? With the tachometer fluctuations it could be a misfire. Check the easy stuff. Mouse nest in air box? Spark plugs‘ condition, gap, color. Fuel fresh, water contamination? 2012 with 70K miles it could be suffering from many conditions associated with long term storage.
That's a good point (highlight)
This truck is a relatively low mileage truck considering its age. And I'm guessing that it presents very well to the eye because of that?

I consider it good news that the OP doesn't hear any alarming noises, but if it were missing bad enough that it couldn't overcome 4000 rpms I would have expected the post to have mentioned the miss. And I normally would expect a bad miss to throw some codes and perhaps a dash alert of some kind.

Yea, I would add to the list a tankfull of fresh 93 octane fuel.

Of all the recent new threads by new members who have just purchased used Ecoboost F150 's and having issues immediately, THIS truck I feel the best about. Lol
I'm really hoping fresh plugs gapped nicely, fresh oil and gas, clean intake (Intercooler) and suddenly this truck is purring like a cat and roaring like a lion at WOT. :)
Fingers crossed!
 

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2021 Powerboost Platinum FX4 Kodiak Brown
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11,089 Posts
Wait, I didn't realize it runs normal with aggressive throttle but only acts weird at WOT.
That's a very different and specific situation.

I'm back to suspecting Throttle Body and/or Throttle Position Sensor. I think you can do a recalibration of your Throttle Position Sensor.
 

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2021 Powerboost Platinum FX4 Kodiak Brown
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Pretty easy to change plugs on this truck but the plugs themselves are pretty fragile. So soft hands and gentle tool contact is called for. Get comfortable, get good lighting, and take your time.
A uhaul type shipping blanket draped over the truck where you lay your torso makes it a comfortable and clean task.
 

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2021 Powerboost Platinum FX4 Kodiak Brown
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11,089 Posts
Ha. That’s a good possibility also. I don’t know how that works but would the OP have been driving around in that mode?
Wouldn't it be something!
 
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