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Old 07-23-2008, 11:12 PM   #1
illinipo
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Shift Solenoid woes... read here!

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/ht...20Strategy.htm

http://www.zoom-tech.com/downloads/s...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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Old 07-24-2008, 11:14 AM   #2
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good post with good information.

I say sticky. any other mods agree?
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Old 07-24-2008, 11:43 AM   #3
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That's awesome! Thanks for the info. I have a high mileage ATX so this is going to be handy.
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Old 07-25-2008, 12:33 AM   #4
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sticky for sure!
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Old 07-25-2008, 12:36 AM   #5
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Indeed. If I had a nickel for every auto tranny shifting weird thread I've seen...
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Old 07-25-2008, 01:05 AM   #6
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Well done! Thanks!
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Old 05-13-2009, 04:27 PM   #7
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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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Old 12-07-2009, 05:02 PM   #8
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Same problem going on as the previous post. Found out its the solenoid A.
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Old 12-07-2009, 05:25 PM   #9
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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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Old 12-07-2009, 11:02 PM   #10
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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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