Misfire That I cannot seem to Fix. I TRIED! Also lunging RPMs.

You have an 11 flex, right?  I just looked up your car on rockauto and they do have one listed for your car, but that looks like a rebuilt one for the 6F50 trans.  Pretty sure your car has the 6F55 transmission.  Not sure if the parts are interchangeable and probably wouldn't risk it either. 

I'd go new and oem.  Call ford for the part number and find it online somewhere.  Tasca or a similar website should have the part.

Also, it's recommended to do a complete rebuild when doing a TC.  If you just do the TC and the trans is contaminated, you'll end up destroying your new part again.
 
pmezo33 said:
You have an 11 flex, right?  I just looked up your car on rockauto and they do have one listed for your car, but that looks like a rebuilt one for the 6F50 trans.  Pretty sure your car has the 6F55 transmission.  Not sure if the parts are interchangeable and probably wouldn't risk it either. 

I'd go new and oem.  Call ford for the part number and find it online somewhere.  Tasca or a similar website should have the part.

Also, it's recommended to do a complete rebuild when doing a TC.  If you just do the TC and the trans is contaminated, you'll end up destroying your new part again.
Click to expand...

yes, both the 6f50 and the 6f55 use the same torque converter. The part number is even the same from Ford. I can buy a Re-manufactured converter for 200 dollars.

I Don't see myself shelling out the money for the rebuild of the entire transmission. The fluid has been in good shape with nothing to indicate otherwise that there should be any issues. It shifts perfectly and does not slip or have any other issues. I will change the filter that is in the side housing, I found the number for that and will put in fresh fluid all around. 

My brother will be driving the car soon long term so if it happens to end up needing it all rebuilt and replaced I can worry about that then. I figure if I can drop in a few hundred dollars worth of parts and the problem is cured then I am happy.
 
Careful with Fordparts. It doesn't​list the whole part number and can be deceptive. It makes it appear that the 2.7 f150 and the 3.5 f150 use the same turbos. Tasca, however, shows a "more complete" part number that is clearly different. The base number was the same.

Sent from my Moto G (5) Plus using Tapatalk

 
It has been suggested that searches by VIN number are more accurate, tho a few exceptions might still crop up.
 
SHOdded said:
I am not so sure the torque converter is the same, even though the part number is the same (as you say) between 6F50/55.  But ok ... Give it a go and let's see what happens.

For some reason, I am not seeing any Ecoboost related selections on FordParts.com.  VERY strange.  I looked under Flex and Taurus.

Is this the part you found?
https://www.fordpartsgiant.com/parts/ford-converter-asy_aa5z-7902-b.html
Click to expand...

Pretty sure this is the part he's looking at.

https://www.rockauto.com/en/catalog/ford,2011,flex,3.5l+v6+turbocharged,1446490,transmission-automatic,torque+converter,8668
 
yes the deeper I dive into this the more confusing it seems to become.

I looked it up on ford parts giant and found the one that matches my vin as aa5z-7902-b

the one off of ford parts just showed the 7902. I entered the vin and it showed the more expensive option. So I know it lists two converters. but there only seems to be a difference for the flex.

if you check florida torque converter they list two converters as well with the only different one being for the flex. So now I need to determine the difference!
 
SHOdded said:
It has been suggested that searches by VIN number are more accurate, tho a few exceptions might still crop up.
Click to expand...
I search by make/model on tasca, then verify by vin. I've found that to be the simplest way. Love me some tasca.

Sent from my Moto G (5) Plus using Tapatalk

 
Call your local ford dealer parts department and ask for a price and part number and go from there.  I'm sure they'll look it up by vin.
 
pmezo33 said:
Call your local ford dealer parts department and ask for a price and part number and go from there.  I'm sure they'll look it up by vin.
Click to expand...

I have been researching it. The part number listed above is correct as far as anyone can tell. I am just trying to determine the differences for reference. They cannot find but 2 or so in the whole country and its about a 2 week wait supposedly.

I am looking at a reman from someone but they are researching the converter to make sure that everything will work.

The outside bolt pattern and attachment are the same for the two converters. the only difference is probably the stall and stator count. That is being confirmed right now. I just like to obtain this type of information because I feel it can prove useful to someone including myself.
 
To the OP of this problem, did you ever figure out what the problem was? I'm having a similar problem and was wondering.
 
Bronco2fan said:
Thanks for fixing it lol. I couldn't figure out how. Where do I update info?

Sent from my LGLS991 using Tapatalk
Click to expand...
Its under (Forum profile) which you can add the type of vehicle and any current mods you may have next to signature.
If you have any issues feel free to pm your info and will make sure to update it.  Z
 
So nobody ever heard how or if this problem was solved? Is this one of those things I'd have to take to a tranny shop and have them run diagnostics on the tranny? Really curious because it sounds like my issue too and I'd rather not throw parts at it and hope to find the problem.
 
If the RPMs fluctate at steady load, that has ended up being the torque converter, in which case having the trans rebuilt is the "cheapest" viable option.  Also suggest having the TSS/OSS sensors replaced at the time, and the valve body/solenoid body checked/cleaned.
 
Thanks for the input. I'm gonna drive her a bit and make sure. Would doing a fluid change first be a viable option with the tranny before having it rebuilt? Or what about the relearn process first too? Just wondering about options.
 
No harm will come of either of those optional actions.  But be prepared to go in for a rebuild despite them.  Usually the relief, if any, will be temporary at best.  This is the issue I am referring to as fluctuating rpms.
! No longer available
 
Watching the video, mine is noticeable at low speeds, haven't noticed it at high, but will check that now that I saw how fast he was going. But basically the same. Feels sluggish at 30 to 40 MPH, tach bounces around too.  Runs like a BOOH when I punch her, little lag. New plugs, Air filter, cleaned MAP, MAF, still the same. Thanks for your Knowledge.
 
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