Low epc pressure on 5r55e

[Nctruckman]

I was looking into a hesitation to shift under WOT on my 2003 5r55e. I have forscan lite on my phone with a obdlink mx reader. I noticed the epc pressure ranged from 10-65 psi while driving, which is low as per the Ford shop manual. If the valve body gasket was blown, wouldn't it not shift or move at all? I know ford has an updated epc solenoid and bracket, could it fix this?

 

[Fix4Dirt]

I was looking into a hesitation to shift under WOT on my 2003 5r55e. I have forscan lite on my phone with a obdlink mx reader. I noticed the epc pressure ranged from 10-65 psi while driving, which is low as per the Ford shop manual. If the valve body gasket was blown, wouldn't it not shift or move at all? I know ford has an updated epc solenoid and bracket, could it fix this?View attachment 428891

View attachment 428892

yes low pressure can cause hesitation and delayed shift i;d start with the ford revisions or the sonnax/transgo kit (iirc all achieve the same result)

 

[Nctruckman]

yes low pressure can cause hesitation and delayed shift i;d start with the ford revisions or the sonnax/transgo kit (iirc all achieve the same result)

Would I be better off getting an updated complete valve body or just modifying the one I have? It does have a sct tune, it shifted really nice and firm before, it does now intermittently.

 

[Fix4Dirt]

Would I be better off getting an updated complete valve body or just modifying the one I have? It does have a sct tune, it shifted really nice and firm before, it does now intermittently.

it could go either way, as usually iirc updated VBs are somewhere around 300-500, and the transgo was 100 iirc if central valve bodies is still around, they had good stuff iirc

 

[Nctruckman]

I found shift rite ones for a little under 3. Thank you for the input. I was gonna try the updated BW epc and updated bracket first to see if that's it, but now I'm hesitant.

 

[Nctruckman]

I redid the test and at 1000 RPM it is 45 PSI and at stall speed it is around 113 PSI. So that meets the test specs in drive. I did notice however when I'm coasting or when I let off, it drops extremely low into the single digits. Is this normal or is this an issue?

 

[Fix4Dirt]

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try reading this, iirc it has common issues w these units

 

[Nctruckman]

I'll be getting this to hopefully fix any issues, its from CVB. Also have the updated epc solenoid and bracket coming if I need it. Might be a month or so before it gets installed

5R55E, 4R55E Valve Body, Updated and Tested with Solenoids | eBay

 

[Fix4Dirt]

sounds good! keep us posted!

 

[Nctruckman]

Swapped it out, made some dowel pins to help align it when reinstalling it. Put on a pan with drain too after getting an atf shower

 

[Fix4Dirt]

did it resolve the issue?

 

[Nctruckman]

It shifts nicer, but no, it still won't shift if you put it to the floor I'm gonna try taking the sct tune off and see if it still does it. I replaced the tps with a ford one, is there any other sensor that'll cause this?

 

[Nctruckman]

So I reloaded the sct tune it had, then cleared the transmission adaptive tables and now it's doing great.

 

[Nctruckman]

This popped up again, culprit is actually a plugged fuel filter causing the issue. This is from the cut open filter

 

[Fix4Dirt]

This popped up again, culprit is actually a plugged fuel filter causing the issue. This is from the cut open filterView attachment 431105

sheesh!!! thats all in the filter? dang.

 

[Nctruckman]

Yep,I'm dropping the tank today. Engine wasn't running right and therefore couldn't shift right

 

[Fix4Dirt]

Yep,I'm dropping the tank today. Engine wasn't running right and therefore couldn't shift right

let me knownhow the tank looks!

 

[Nctruckman]

This was left over from whenever the previous owner changed the fuel sending unit and didn't clean it out. Not much debris.