Sorry this took awhile to respond. It’s a 2016 2.7 EcoBoost which has had plenty of coil issues in the past (Ford stopped making that motor because of the turbo fouling the coils.

it was a P304 code: #4 coil. But the bad one, which I got from Amazon and came in a Standard Ignition box, had NO markings, numbers, names, nothing. So it may have been a WingChow part that Amazon sold in a Standard box (sure. Try to get your money back for that). The new coil is a G P Sorensen.

So…..IF the dealer put authentic Standards in #5&6 (I trusted the boxes they gave me) in February, and I now have a Sorenson in #4, I have to decide what to do with #’s 1-3.

Three new verified Standards or Sorensons?
or is having them all “match” that important which would mean either 4 Standards, 5 Sorensons or 6 …. ??????

 

Ford still makes the 2.7 TT motor as of today! Turbos do not foul coils or plugs for that matter as far as I know! If it were me I would Buy 6-OEM coils and replace them all at once!! That's where I would start and while you have the coils off, pull the plugs and check for the Gap on all 6---

 

Huh? They never stopped making the 2.7 EB, and in fact it's regarded as an excellent motor.

As for the coils, are any of the coils OEM at this point? Did the OEM coils die?

 

Two of the OEM coils died in February. Figuring that, if those two failed, the other four weren’t too far behind so I replaced all six.

By OEM, you mean Motorcraft? They don’t show up on any of the highly-rated reviews

 

Wow, there is a mix-up going on!
A P0304 code is not a coil code. but a combustion fault.
A P0354 code is a coil primary ckt code failure, an electrical failure.
Look the codes up to see this.
My bet is you have a boot or a Plug issue in cylinder 4, or some other cylinder fault.
At wide open throttle, the Turbos are pumping hard and pressure is highest when the most spark is needed.
Good luck.

 

In my experience the coils do not fail nearly as much as the coil boots. The boot and plug get carbon tracked. Replacing one and not the other only causes the problem to reoccur. In addition, if we are talking about a 2018-2021 2.7l from an F150 about 99% of the aftermarket listing are wrong for both the coil and boot. The replacement boot is not available separately (2018-2021 only). Finally Autolite, some NGK, and other aftermarket plugs come gapped to large which contributes to the problem re-occurring.

My advice. Properly diagnose the problem by shifting coils and boots to prove the issue. Replace all 6 plugs with the correct current Motorcraft plug numbers and use the Ford recommended dielectric (brake) grease XG-3-A. Then replace the offending coils with Ford parts. Beware of counterfeit plugs and possibly coils. I verified (another) Amazon shipment of counterfeit plugs just two weeks ago. A friend insisted on saving $10.