Explorer eecv TC lockup problems

Anything about Ford EEC tuning. TwEECer and Moates questions dominate, but there's some SCT and OBD-II knowledge too.

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DRod
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Joined: Sun Mar 26, 2017 10:19 am

Explorer eecv TC lockup problems

Post by DRod » Wed Jun 13, 2018 1:50 pm

Having some trans issues now. Backstory is: '00 explorer 5.0 swapped ranger, built 347 stroker, SCT Livewire TS+ tuned by Gil at HP Specialities here in Vegas, built 4r70w; old torque converter started slipping/not locking up anymore. Lots of metal debris when builder dropped the pan, flushed it all, flushed lines and radiator, installed new PTC converter. Trans still has issues occasionally. Problem happens randomly. Truck will be doing fine, shifting and locking up as it should, then randomly it will stop locking up all together, everything else will be fine though. Sometime can hear it start to lock (meaning rpm will start to drop then kick back up) then it will kick out and not lock anymore. No CEL's. Sometimes it will just stop locking up randomly like when siting at a light. Will have been locking up normally leading up to the light, then upon taking off and hitting 3rd & 4th gear, it won't lock.

Here's what's strange. If I pull over and reflash the tune (have three different tunes that are basically the same that it does the same thing with and a different ecu as well so that's ruled out) upon reflash, the trans starts locking up again how it should. Problem will be fixed for some time then it will randomly stop locking up again. What could be causing this? It's not temp related because even when the trans is fully up to temp and is reflashed, it functions normally for the next 15-45+min sometimes. I initially suspected wiring to be the issue but once I found out the problem was solved with a reflash, it really has me questioning things now. Any opinions?

DRod
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Posts: 34
Joined: Sun Mar 26, 2017 10:19 am

Re: Explorer eecv TC lockup problems

Post by DRod » Wed Jun 20, 2018 5:25 pm

Bump...really need some help with this. Been fighting it for weeks

DRod
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Re: Explorer eecv TC lockup problems

Post by DRod » Fri Jun 29, 2018 9:31 am

Found out that a KAM reset is enough to get the TC locking up again properly how it should. I've noticed that my brake switch isn't unlocking the converter while driving like it should when the brakes are tapped. Also the TC isnt coming unlocked when going up a hill/ load is increased. I hit 3/4 throttle up a hill and it was still in lockup until it eventually kicked it out of lockup mode (different than just unlocking how it should) and I had to pull over after the hill and do a KAM reset.

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cgrey8
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Re: Explorer eecv TC lockup problems

Post by cgrey8 » Fri Jun 29, 2018 11:37 am

I have no clue what setting has gotten messed up to cause this. But this level of info is what somebody in the know would like to have.

But even more importantly, can you post the tune and indicate what strategy the tune follows?
...Always Somethin'

89 Ranger Supercab, 331 w/GT40p heads, ported Explorer lower, Crane Powermax 2020 cam, 1.6RRs, FMS Explorer (GT40p) headers, Slot Style MAF, aftermarket T5 'Z-Spec', 8.8" rear w/3.27s, Powertrax Locker, Innovate LC-1, GUFB, Moates QuarterHorse tuned using BE&EA

Member V8-Ranger.com

DRod
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Joined: Sun Mar 26, 2017 10:19 am

Re: Explorer eecv TC lockup problems

Post by DRod » Sun Jul 22, 2018 12:30 pm

cgrey8 wrote:
Fri Jun 29, 2018 11:37 am
I have no clue what setting has gotten messed up to cause this. But this level of info is what somebody in the know would like to have.

But even more importantly, can you post the tune and indicate what strategy the tune follows?
So, took it back to the dyno, drove around for a bit and found out that the TC is coming unlocked "due to shifting", even if it's already in 4th (so it wouldn't be shifting again obviously). KAM reset makes it good to go again. Only thing I can think of is TPS sensors have changed since we calibrated the trans last. Was using the old explorer TPS and it was out of adjustment for sure due to positioning. With the mustang TPS it's set right at .80v verified.

I'll post the tune when I get back home, the strategy is READ0A7*

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