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Token Engin-nerd
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Discussion Starter #1
Okay so in an effort to dispel confusion and misinformation, I decided to make a user-friendly guide to 4f27e shift solenoids. im using these docs as my sources

http://www.atsgmiami.com/articles/html/4F27E Shift Strategy/4F27E Shift Strategy.htm

http://www.zoom-tech.com/downloads/support/tranxpages/ford/4f27e.pdf

Shift solenoid A:
This solenoid appears to ONLY control 3-4 shifts.

Shift solenoid B:
This solenoid only controls torque converter lockup. When this solenoid is activated, The clutch inside the torque converter locks the stator to the impeller, making it a mechanical connection rather than a fluid one. Improves engine efficiency, and also drops the rpm by 200-300.

Shift solenoid C:
This is the big mamma. This solenoid controls the forward clutch for each shift. It is a pulsewidth-modulated solenoid, meaning the time length of a shift can be changed via an ECU tune. If this solenoid goes bad, you will have issues with the rpm jumping up really high during shifts and the trans will hesitiate to go into gear.

Shift solenoid D:
This solenoid controls whether or not first gear is engaged. When it is activated, it empties an accumulator filled with fluid, which releases a spring that engages 1st gear. This is why 2->1 downshifts are relatively rough. This solenoid also opens the 2nd/4th band of clutches when 1st is engaged. If this solenoid goes out, you may experience bucking when starting from a stop, or troubles downshifting into first.

Shift solenoid E:
im having a hard time figuring out what this one does, but it appears to only control 2-3 shifts.

EPC solenoid:
This solenoid controls how much pressure is in the solenoid system. It is told how much to give by the throttle position sensor. More throttle = more pressure.





obviously im just an amateur... just hope this will help someone out when we say "Shift solenoids are going out"
 

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Dragon Warrior
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309 Posts
good post with good information.

I say sticky. any other mods agree?
 

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coffee, have some
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5,971 Posts
That's awesome! Thanks for the info. I have a high mileage ATX so this is going to be handy.
 

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Broken cars s[:)][:)][:)] :(
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sticky for sure!
 

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MyCarBreaksAlot
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Indeed. If I had a nickel for every auto tranny shifting weird thread I've seen...
 

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Infidel
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3,307 Posts
Well done! Thanks![thumb]
 

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Bringing this from the dead

1. My problem has gotten significantly worse as of a week ago. My engine light has come on and my car will not shift into OD. When in 3rd if OD is on my car will rev (to redline if I push hard enough) but will not actually accelerate.

I'm wondering if this problem would need solenoid 'A' and 'C' replaced or just one? From the explanation on solenoid C it sounds as if that needs to be replaced for sure which brings me to my next question

2. Does anyone have the part number for SS 'C'?
 

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MyCarBreaksAlot
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8,609 Posts
My OD went out and had the same problem as above post and it was also only A. You should be able to scan it at a parts store and see what the check engine light says is malfunctioning.
 

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Focus Hoarder
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3,633 Posts
o.o

ok im just swapping out the shifter solenoids of my parts engine to my wrecked cars engine.. XD yeah I have a lazy shift on that car it sounded like I was missing 1-2 everytime and pegging the rpm's

hehe I'm eventually gunna have to get to my blue focus's its starting to do that aswell
 

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Ya i know im that guy bringing a thread from the dead... but thats what the SEARCH function is for (more people need to do this!) ok enough rant and rave from me...

I have a question on which "noid" to replace... One night going to get food from my shop i was driving easy and all of a sudden it shifted really hard from first to second i think, or from second to third and my O/D off light started flashing orange/yellow which means trans problem and needs to get fixed... I went in made it to wendys got food(20 mins) and then went out and started it up and no lights nothing... drove back and nothing happened. So that leads me to think that "noid c"

But also my trans slips/revs up every shift everyday from 2 to 3, but that means it is "noid E"

So overall the main question is should i do both? Or just C or just E?
I also will be changing the fluid and filter as i do this just need to know the best way to go, and if i can save money then thats always good too.

Thanks everyone sorry to bring it back from death but thats searching for ya!
 

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Token Engin-nerd
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3,414 Posts
Discussion Starter #12
might as well do both while youre in there, fluid/filter will be 40-50 bucks every time you open the trans and each 'noid is what, 20 bucks?

I dont mind you bumping my thread from forever ago, thats what its here for [:)]
 

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Maybe we could add to this with some Ford part #'s? This might help for those who need to replace it.

It seems to be that the Solenoids "A" and "E" have the part number of: XS4Z-7H148AA
Thats the only number I know though.
 

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Token Engin-nerd
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Discussion Starter #14
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i have never done any work on my focus before i am new to the focus i have been an escort guy for a long time. i have a bad solenoid a and c. i am getting the parts in the mail but have no idea how to remove and reinstall them or even where the solenoids are located. I need help ASAP! can anyone out there help me out
 

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Confused shifter

I'm diggin your threads, lots of good info I see but I haven't come across a match to my issue. I have a 2003 SE w/2.3 automatic and 124xxx. It drives great but some times it acts as if it doesn't know what gear it wants to be in. It u usually happens at low speeds, like when slowing down or driving in slow traffic, the car will slam when down shifting. The other issue is when up shifting, it tends to shift in to 4th or OD to quickly causing it to bog down. Is this a solenoid issues? it doesn't slip or rev, just slams or over shifts. Thanks for the help.

I'm FNG to this group so sorry if I broke any rule or asked a fool question. Your thread just seamed full of knowledge, thanks
 

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[dunno]I've been having trans shifting problems where my focus will not go into first gear at times and then will drive completely normal at other times. when 1st gear will not engage, it just sits in 2nd gear and gives a very slow take off, delays shifting into above gears and slams into gears when it does finally shift. when slowing down, it seems like it will try to shift into 1st but won't go in so it just slams back into 2nd. if I try to manually shift, it usually won't work and will just shift itself, even if the shifter is on 1st. i was reading an earlier post about shift solenoids and the purpose of each and i think its ss d. can anyone confirm this or any other ideas as to what could be wrong?
 

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Thank you for the info.

I recently changed all solenoids and intermediate band, as I had issues with 2nd and 4th gear. Now, my reverse doesn't work.

Wondering, which Solenoids control reverse?

Thank you all in advance.
 
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