torque converter lockup

B

buchshot1

Registered
I just rebuilt my tranmission with a new torque converter.
the torque locks up very earier and does not unlock untill the car is about to stall. not sure on what is going on. any idea's
 
Sticking lock-up piston ,solenoid issue, or wrong lock-up program schedule.

Did you rebuild the unit yourself or did you buy it from someone? Also, if the unit is not to stock spec, the program schedule in the computer may need to be tweaked.
 
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i did the rebuild myself, I did add a bunch of goodies to it with no programing.
and it does not unlock with the brake peddle it holds it untill about 400 rpm!!
 
If your brake lights are working, you likely need a tune in the form of a chip or reflash.

What torque converter do you have?
 
its a 2500 stall dominator. it did the same thing with the stock one.
at what rpm is it supposed to lock up, and what wire is the signal on.
I havent found a book on this car yet.
 
I believe stock setup is to lockup about 35 mph, but the unlock should be instananeous with the brakes. I believe there could be a possibility of a TCC solenoid issue as well. That was suspect in mine not locking up after the new tranny was installed, but it tuned out to not be the case.

I don't have the manual with me to help with the wiring, but a search here should turn something up.
 
if I had to guess, which is what we are doing at this point.

IF it did it with the stock trans..and now it's doing it after a rebuild.
I can only think of one common thing..

did you change the TCC lock up solenoid?
if not, that is going to be your first hurdle.

good thing is.. you only have to pull the pan to get to it..
 
So I need to figure out if its being told to lock up and if its being told to unlock at this proper times. I also just remembered that the over drive button does not turn off the over drive. I'm amost leaning toward a pcm issue.
 
There are tests for the resistance of the TCC solenoid, unfortunately I forget what the ohms value is supposed to be.

You really need some wiring diagrams and diagnostics at this point to keep from doing more harm and just throwing parts at it. The OEM manuals have good transmission sections, unfortunately a lot of their diagnostics rely on special tools and test equipment.
 
overdrive button is a simple fix..and not related to your lock up issue.
OD button fails due to a broken wire under the console.. it's very common and easy to fix.
 
After some different testing( I still havent hooked it to a scanner yet) I Have noticed when placed in first it doesn't bog down and try to die. but when I go from 1st to 2nd or drive it bogs it down a little bit. I dont think the torque converter is fully disengageing
 
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I might go out and replace your Brake Switch on the brake pedal, also known as the BOO switch. Its pretty cheap and controls the converter lock-up.
 
Well for one thing not related to the lockup, you purchased a TC with less stall speed than stock. Stock is around 2800 rpms. As for the TCC sol. valve you should always replace it during a rebuild. To check one you read the resistance across the contacts. The EEC IV vehicles should read 1-3 ohms for 93-95 (except for 95 Town car, Crown vic and Grand Marquis which are already 10-16 ohm) and 10-16 ohm for 96 and newer vehicles.
 
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