Ecoboost f150 misfire 4,5,6 !

[silverfoxclaim]

Only happens when raining and when I accelerate hard !
Big pain ! 2012 any suggestions

[silverfoxclaim]

Dry weather now # 4 happened again !!!!!
New plugs gap 29-30 4,5,6 bank new !

[silverfoxclaim]

Problem solved !
Back too stock running 94 octane
Does not misfire ! Does not have the
Pep like it use too but hate the engine codes Diablo u
Have some work too do !

[silverfoxclaim]

Try and go back too a different
Tune ,Mile booster see what
Happens

[silverfoxclaim]

mileage booster works fine too ,wonder why 93 tune all of a sudden cant take it
without a misfire ? its like once in a while it works but mostly not !

[sohfast94]

Did you replace all the plugs or just 4,5,6?

This is definitely an ignition issue. The only difference between the MPG,87,tow and 93 is more boost.

Especially that you say it works "sometimes" mean it's plug related so please run the recommended plugs (Motorcraft SP-534) gapped at .028

[silverfoxclaim]

plugs are month old gapped
29 and are the right ones !
As soon as I put back too stock
No more misfire ! So I then loaded mileage
Booster and can't get too misfire !
93 even through a few codes, multiple
Cylinder misfire and # 4 etc
It's strange ,maybe I didn't have one of the rpm rev
Limiter set right , lll have too go back and load 93
And limit my parameter adjustments to basic
See what happens

[sohfast94]

What do you mean by set right? Have you been adjusting things with the tool? If so, what exactly?

[silverfoxclaim]

Tire circumference ,speed limiter off,first rev limiter little higher
Little firmer shifts ,5% more fuel @ 4-7000 and .5 more timing
That's it ,the only thing that maybe I should leave alone is rev limiter ?
Maybe that's a mistake ?

[mikel]

how big are the tires?

I would not add any spark, thats scary.
Why are you adding fuel?

[silverfoxclaim]

stock ,275,55r20,93 tune ,94 octane, was pinging alot added 5% extra fuel then it went away
so spark with tune was 2.5 + tried .5 extra = 3,with still really no ping ,didnt matter
if was 2.5 or 3 the new plugs left bank seem too misfire alot starting with #4 ,so stock is fine and
miliage booster was fine too,at stock now going in for service,like i said earlier,all plugs are new
and gapped 29 exact,it did work a few times without misfire ,thing is fast ! chirp at pretty high speed !
motor idles nice & steady,might be a weak part not sure if it is a coil or plug under these extreme
conditions,had my fun for now ,think i will try the 87 tune next with 89 octane ,but i loved the power
of the 93 tune even at 1/2 throttle its fast ! would be embarrassing if i lost at the lights against a hemi
when acting up ! rather loose on a 87 tune ! anyone else out there run into this problem ?

[mikel]

if they are stock tires, there is no need to make any changes to the tire settings.

post your tune files when you have a chance.

[silverfoxclaim]

shell vpower 91 gets best gas miliage and points for me ,so works out better than 87 money wise,
but has no ethanol,so pings bad with 91 tune,like the extra boost though ,thats where i will most likely
end up,whats your recommendation,add more fuel at wot 4-7 too lesson ping and leave everthing else
alone? once i get here i will send u some info if im not content

thanks

[sohfast94]

Try taking 2 deg out of the global spark and see how it reacts. This thing have a catch can on it?

[silverfoxclaim]

Was going too put one on last week
But had a look at pvc tubes and didn't look like
Any or basically nothing much was getting by from
What I've seen before,it's on my list
Wasn't sure which one I should get seems like
A new design comes out every 6 months
Thanks