bad torque converter symptoms

[blazes9395]

Originally Posted by blazes9395

Also to check to see if in fact your TCC is working, there is a TCC ground pin in the diagnostic link under the dash. I don't remember which pin it is, but if you ground it it will force lock-up. Do this when you going about 40mph, ground it at this point, if the RPMs go down and it locks up, you TCC is working. If there is no lock-up when you ground the pin, you have a tranny, or convertor problem.

Good Luck!

Using this method above, will overide the whole circuit, and directly link to the harness right to the tranny. If this method does not lock-up the convertor, no matter what you do with things like the brake switch (applying the brakes lightly), or anything else, you will not get lock-up.

Yes this will defiently give you poorer gas milage, and eventually overheated tranny too.

[MT-2500]

Originally Posted by wyatt_earb

Ok. I just changed the filter and I'm going to have to take the pan off again so I'll buy a gasket for it. Is the best way to drain the fluid to jack up the vehicle as high as posslible and let it set over night? This is what I was told, told this will drain most of the tranny fluid.

It does help on the dribbling/mess but you can not get all of the fluid out with a pan drop. Just 5-7 qts.
And make sure you check the small drain hole from the servo on the right side.
If you look at pan and gasket there is a notch cut out for it.
If sealer has ever been used it could be stopped up.
Wipe the bottom of transmission pan gasket are clean and transmission pan and put a good cork gasket on dry.

[wyatt_earb]

Should I try this? And if so, which pin grounds the TCC? Thanks.

[Blue Bowtie]

Grounding ALDL pin 'F' will only work if the connection at the transmisison is intact. Also, it will only function if the auxilliary contacts on the brake pedal switch are closed, and there is 12VDC present on the purple wire at the switch.

Grounding this pin will operate the TCC solenoid valve completely independent of the ECM, so any other possible parametric causes for the TCC to remain open will not be an issue.

You need to be sure the vehicle is either in motion or that the vehicle is raised and secured with all drive wheels off the ground.

[wyatt_earb]

Let me make sure I've got this right. I ground the "F" pin, while driving at a consistent speed? Something like 45mph? And if I dont feel a drop in RPMs, TCC kick in, then theres some serious shit wrong?

[blazes9395]

Originally Posted by wyatt_earb

Let me make sure I've got this right. I ground the "F" pin, while driving at a consistent speed? Something like 45mph? And if I dont feel a drop in RPMs, TCC kick in, then theres some serious shit wrong?

Well, it doesn't look too good if this is infact the case.

[wyatt_earb]

I havent been driving it much at all lately, tihnking about just selling it. It's too damn cold to mess with it right now, -20 with windchill. But surprisingly it starts like a champ, I let it run for awhile since its so cold.

[frehol]

Originally Posted by Blue Bowtie

Grounding ALDL pin 'F' will only work if the connection at the transmisison is intact. Also, it will only function if the auxilliary contacts on the brake pedal switch are closed, and there is 12VDC present on the purple wire at the switch.

Grounding this pin will operate the TCC solenoid valve completely independent of the ECM, so any other possible parametric causes for the TCC to remain open will not be an issue.

You need to be sure the vehicle is either in motion or that the vehicle is raised and secured with all drive wheels off the ground.

Is there a wiring diagram over the TCC circuits?
Can I by monitoring the F-pin see if PCM is trying to lock up the TCC?
Fom what I read here I figure the wiring should be something like:

+12v----[break switch]-----[TCC solenoid]----[F-pin]----[PCM]---Ground

Just curious.
/Freddy

[upsfusion]

99 s-10 4x4 Between 50 and 65 mph, 4L60E let off the throttle just a tad between those speeds, the truck jerks, the tach doesn't move, the fuel pressure gage stays at 55 lbs. hesitation on take off when stopped or coast stop, Torque converter?

[MT-2500]

Originally Posted by upsfusion

99 s-10 4x4 Between 50 and 65 mph, 4L60E let off the throttle just a tad between those speeds, the truck jerks, the tach doesn't move, the fuel pressure gage stays at 55 lbs. hesitation on take off when stopped or coast stop, Torque converter?

NO.
Between 50-65 steady speed no pull or uphill converter should be lock in and stay locked in when let up on gas a little.
This post is old and should be dead.
Best to start our own new post on your problem.
I would get a computer read out and code check on engine and transmission.
Best to start your own post on this.

[j cAT]

Originally Posted by upsfusion

99 s-10 4x4 Between 50 and 65 mph, 4L60E let off the throttle just a tad between those speeds, the truck jerks, the tach doesn't move, the fuel pressure gage stays at 55 lbs. hesitation on take off when stopped or coast stop, Torque converter?

this is old and also not a torque converter issue. check engine with scanner , check fuel trims also TPS check. IAC TB cleaning recommended.

[harrybolton]

Hope this gets fixed soon! Helpful thread!