2009 ford e 250 with 4r75w has intermittent 1-2 flare FIXED

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aamcourbandale
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2009 ford e 250 with 4r75w has intermittent 1-2 flare FIXED

Post by aamcourbandale » Mon Aug 17, 2015 12:23 pm

We have this van that was towed into the shop with 1st and reverse only. Rebuilt with kit, heavy duty torque converter, all accumulators and pistons changed, epc changed. I did the sonnax sure cure kit as well. The issue is it has an intermittent 1-2 flare under harsh acceleration. Under normal acceleration there are no problems. Has anyone ran into this before?
Last edited by aamcourbandale on Thu Sep 10, 2015 5:22 pm, edited 1 time in total.

zzyzxpat
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Re: 2009 ford e 250 with 4r75w has intermittent 1-2 flare

Post by zzyzxpat » Mon Aug 17, 2015 12:28 pm

Not to be a pain, but the 1-2 shift can't flare, nothing releases, the intermediate clutches simply apply. I would be looking at pressures and possible a dirty MAF to start with.
Pat Schulte
AAMCO Transmisssions
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Re: 2009 ford e 250 with 4r75w has intermittent 1-2 flare

Post by rebuilder67 » Mon Aug 17, 2015 1:03 pm

I came across a couple 4R75w's that needed the trans tables cleared but after that you have enable trans tables. its only on 2007 and up that it works. its worth a shot and worked great for me. it had poor shifts across the board.

aamcourbandale
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Re: 2009 ford e 250 with 4r75w has intermittent 1-2 flare

Post by aamcourbandale » Mon Aug 17, 2015 2:58 pm

Probable a bad example, if its not a flare, but maybe it slips a little and then jumps into 2nd? Pat, would you rule out the 1-2 accumulator? And if its the intermediates, what would I test? I know I can air check them, but they must work due to it shifting fine driving normal. Plus, this is intermittent. I feel we have a pressure loss, just don't know where to test. It only did it twice on a 4 mile test drive and I drove it like it was nascar at every stop. I know there is a solenoid valve that works like an afl in chevys. But I don't have the reamer for that. I know sonnax makes a drop in fix for the 1-2 accumulator bore if it is worn out. I replaced all the accumulators with bonded where applicable. I replaced the 2-3 accumulator with the plastic one. Never had this issue before of course.

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Re: 2009 ford e 250 with 4r75w has intermittent 1-2 flare

Post by aamcourbandale » Mon Aug 17, 2015 3:01 pm

I agree with the reset trans tables idea. but, this thing doesn't have that option which I thought was very weird. Normally you can at least clear the keep alive memory. Reset trans tables, something. I looked in every module and couldn't find that option. I hate Ford, I really do. And of course, they drive this thing rough. Delivery van.

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Re: 2009 ford e 250 with 4r75w has intermittent 1-2 flare

Post by zzyzxpat » Mon Aug 17, 2015 3:39 pm

I doubt if it is the intermediate clutches as you say it drives OK most of the time.

I would still hang a gauge on it and see what happens when it acts up. I would also clean the MAF. The solenoid regulator valve can stick, usually resulting in a neutral or "slip" on heavy takeoff from a stop. If you do many of these I would buy the tool from Sonnax to resize and clean the valve bore, and then just reuse the original valve.
http://www.sonnax.com/parts/2405
Pat Schulte
AAMCO Transmisssions
Temecula, Ca.

aamcourbandale
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Re: 2009 ford e 250 with 4r75w has intermittent 1-2 flare

Post by aamcourbandale » Mon Aug 17, 2015 5:20 pm

You know Pat, it might just be neutraling or slightly slipping like you suggested when the solenoid valve gets worn. I'm going to clean the MAF first and send it back out into the world. Then I'll talk the owner into buying that tool for the valve and just start adding that to the rebuild service. Thanks Pat for the advice.

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Re: 2009 ford e 250 with 4r75w has intermittent 1-2 flare

Post by tranibob » Mon Aug 17, 2015 7:43 pm

If you did not use the bore sizing tool for the solenoid regulator valve, I am willing to bet what you have is a neutral in first on hard acceleration. Resize the bore and the problem will most like go away.
Robert Moreau
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Sonnax Industries, Inc.
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rmm@sonnax.com

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aamcourbandale
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Re: 2009 ford e 250 with 4r75w has intermittent 1-2 flare

Post by aamcourbandale » Tue Aug 18, 2015 4:58 pm

I didn't even know to do the resizing of the bore Robert. Learn something new everyday. Thanks for the advice!

Chad

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Re: 2009 ford e 250 with 4r75w has intermittent 1-2 flare

Post by craigrushton » Tue Aug 18, 2015 7:20 pm

so this was after rebuild? i seen a guy fight this same issue once on your int piston spring is it a hat with a wave or is it a spring style i seen where guys put the wave on the bottom and this will cause a flair the hat goes on than the wave not the other way around basiclly it goes in the way that looks wrong and also the bonded piston needs to be lined up with the bleed hole with the half moon so it will bleed off properly

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