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Discussion Starter #1
My TCC on Lazarus, the black Cougar, is stuck on, in every gear except 1st. :)

I've checked the solenoid, Valve body, check balls; pretty much everything you can look at with the tranny in the car.

It actually drives ok, if rough, lol.

Are there any shaft seals that can cause this, or a particular valve in the VB?

I'm building one to replace it, but it would be nice to know what to look for. :)
 

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Discussion Starter #2
I actually love the way this drives on the highway. :)

The Poly/sport/koni suspension is settling in; I May not need a back brace after all...

It always disengages at a stop, or a manual 1 shift. :confused:
 

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In my experiance it sounds like a bad solenoiod. I've had them ohm out just fine n still be stuck on cuz it kind of welds itself together after the first application
 

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Discussion Starter #4
I've already replaced it with a new one; the old one wasn't bad, either.

This almost has to be a seal on a shaft, or a wormtrack cross-leak in the VB.

I ain't found it yet, tho. :D
 

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1997 Thunderbird 4.6, 1998 Mark VIII LSC
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I'll throw out an off-the-wall question and ask if you've checked the voltage on the wires to the solenoid... Just in case the PCM is fried or the wiring is fubar'd.
 

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Discussion Starter #6 (Edited)
I'll throw out an off-the-wall question and ask if you've checked the voltage on the wires to the solenoid... Just in case the PCM is fried or the wiring is fubar'd.
Yeah, once I saw how easy it was to access from the inside, I ohmed it out.

I checked the circuit while I had the solenoid out when I changed it, as well.

There's a valve in the valvebody that can cause it, so I swapped the VB with another one, and it still has the same problem.

I've been driving it for a year, every few days.

I will probably do a 4-2 or WOT 2-3 one of these days, and it will take a large sh*t on me, most likely; it needs some play there. :D

Something is leaking somewhere... (internally, not externally)

I don't have the VB wormtrack data or the tranny housing fluid flow circuits to look at; if anyone has the resources, point me that way.
 

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Discussion Starter #8
Those are awesome, Chris; I downloaded them a while back.

That's how I'm thinking a checkball, maybe.

Is there a diagram that any of y'all have seen that has the description of the wormtracks in the VB?

Or what flows thru what holes in the shafts?
 

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Is there a diagram that any of y'all have seen that has the description of the wormtracks in the VB?

Or what flows thru what holes in the shafts?
I know the official FLM 4R70W manuals have the complete hydraulic path for each function. It is quite elaborate and way too much to post! :eek:

I'm not sure where my manuals are, but I'll look around tomorrow. If I find them, I'll snap some pics of the lockup circuit and post them. I'm afraid they may be in one of the 50+ storage totes still at the storage shed from remodeling the house over the past year. :rolleyes:
 

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Discussion Starter #10
Driller, if you can tell me what book to buy, I'll do it!

Posting pix is nice too, tho. :)

I'm in for the long haul; when I figure this out, I'll post it up.


I'm resizing teflon seals today, lol.
 

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Discussion Starter #12 (Edited)
Cool beans!!

Thanks for the link; there was apparently a "powertrain..." book, and I've searched for one, but never found it. I think it was a "helm" manual.

Do you think the ATSG manuals that cover the updates, in addition to the linked manuals, will cover everything?

I already have those; the TCC circuits are not mentioned in those at all. :)
 

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I'm interested in what you find. Mine does this also in my drag car. It even locks at the top of first gear. Its only real annoying when its cold and I drive the 100 yards to the first stop sign, it drags the motor down then finally releases. Other than that I think its great for ET's.

I believe Jason Millers also does this.

Mine has been rebuilt a few times. I think with a different VB once. I have a VB from a Marauder I am going to try when I get around to getting the car back together. Its a 95 trans with the extra direct clutches and the mech diode one way.

I used to have one of the B&M shift improver things on it. The electric module that goes inline on the computer wiring. So maybe that fouled the computer that was previously mentioned.
 

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Here is a log of it locking in 1st. This is with a triple plate CC. I have a log somewhere with a single plate CC its not as noticeable on the graph.

 

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Discussion Starter #16
Is it possible to add a value file that writes something I don't have the ability to change, and then later when I remove that function, the parts I can't write are still there?

Like, can I make changes with PRP and value files that writing my base file back in won't change back?
 

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Absolutely. This is actually a periodic discussion point on the PRP forum... the only solution is to re-build the tune from scratch referencing all the values you CAN control.

Or - do what I do - and save each tune revision as its own separate file. ;)
 

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Discussion Starter #18
I'm wondering if I used the "Lock TCC on dyno" option, and I can't overwrite it to put it back...

:confused:
 

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I'm wondering if I used the "Lock TCC on dyno" option, and I can't overwrite it to put it back...

:confused:
Thats an interesting thought. But would the OD light flash if that was still set? I remember while getting my car tuned after it came of the dyno the OD light was flashing and the tuner had to go back in to reset that, IIRC.
 

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Sorry to semi-hijack this thread but I saw up above that Grog6 has changed out the TCC lockup solenoid. I've got what I assume is a bad TCC Solenoid which is causing code P0743 - Torque Converter Clutch (TCC) Solenoid Circuit Electrical. I have a 1995 Thunderbird with 4.6.

I've checked the external portion of the wiring harness coming into the transmission and everything appears fine. I've had problems for a long time with the TCC lockup on the car where it would lock hard and early in third and fourth gears. About a year ago it stopped locking altogether. I'm finally getting around to trying to fix the issue and having problems finding a new solenoid. Ford, Autozone, Advance Auto Parts, and Napa all say they cannot get this part and that none of their stores etc have the part to transfer. I assume my next step is to contact a transmission shop but wanted to ask here first. Can anyone point me to where I can purchase the solenoid if it comes to that? Is the part interchangeable with newer model vehicles with the 4R70W that I could buy the solenoid from?

Also, I gather that I can use a multimeter to test out the solenoid and that I should be able to determine if it is 'good' by the resistance reading. Can I also manually engage the solenoid by applying voltage to the connector with the pan off to check if it is engaging?

Thanks for any help you guys can give. I considered posting a new thread but this one was the closest I found to being applicable and I say Grog6 had bought a solenoid semi-recently.

Thanks,
Willum
 
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