My car has trouble with lock up. I have a brand new TCI converter in the car. It will lock up, but as soon as you increase or decrease throttle percentage it comes out of lockup. Anyone have some ideas on what table I need to go into to see what mine looks like and maybe a table to look at so I can see where mine should be?

 

If u have hptuners post a tune and ill help you out.

These are the tables that you need to address.

 

Thanks man...those will be the first I address.

 

Did you dissable missfires down low? That would be one cause.

 

TCI converters have pretty weak holding capacity, you need to
look at ways to raise the line pressure at light loads (where stock
tune commands 0% pressure / high force motor current but the
motor can be making significant torque). Holding torque vs motor
torque is the slip issue.

You want to look at TCC_Mode and TCC Slip RPM to see if it's a
command (misfires) or a result (pressure) problem.

I significantly reduced the force motor current in the 0% and
adjacent columns as a "patch" for the TCI converter slip. But
for some models there are also "*****" for the TCC-locked line
pressure adder which is more appropriate if available.

 

After looking at my tune the misfires are disabled so that shouldn't be the issue. It is set to lockup in 4th at 60mph and set to release at 56mph. I know those parameters are too close. I really wanna get this lockup issue resolved so I can enjoy the car. I haven't actually gotten to enjoy the car or drive it much since the end of 03/beginning of 04 as I haven't had any good luck. Any help is greatly appreciated.

 

To the top.

 

Brian,

Are you setting the lock/unlock to the same value across all the tps percentages in those tables that 01'WS6 had back in post#2? Or are you talking about a different table? Normally there should be different mph for different tps settings. How are you ramping those?

Can you post your tune so folks can take a look? Or is there other stuff in there you don't want getting out?

I make Normal, Cruise, Hot, and Performance all look the same so there's no question about which one is in charge.

 

No, they ramp, but the computer and HPtuners are Josh's so I don't have the tune right in front of me. Where is the torque converter clutch duty cycle table? I know to set it to max and min of 100 and 90 so maybe that will work if I can find where it is.

 

Here is the HPtuners tune that is in the car. If someone finds something wrong let me know. We changed pretty much everything that I've read.

-Min and Max TCC Duty Cycle
-Mix and Max Misfire Temps
-Lockup and Unlock MPH Tables
-Disable all Misfire

Nothing has worked thus far. It DOES lock up, but with any increase or decrease it comes out of lockup. I also put a new TPS on it today and it's still doing the same thing. It stack shifts and will not lockup and stay locked up correctly.

 

Are you saying that it has other shift issues as well? Am I reading that correctly?

 

Try manually locking the converter through the the vcm controls on the scanner and see if its still coming unlocked. It may very well be a bad converter.

 

There is one oddball cell in the low rpm misfires table that is right in the thick of things & may be causing your issues(unlikely but something to try).

 

Which one is it and can you change it and post it back up so I can load it in or at least tell me where it is and what should be there so we can try that?

 

My stock 98 had the apply/release values just 4 mph apart at 0, 6.25, and 12.5 tps. So you are probably ok there.

Around what tps values are you seeing the lock/unlock toggling around?
What gear are you in at the time? 3rd or 4th?


Your 4th gear release mph is right on top of your 3-4 upshift mph. So that may be contributing to it. Release is 56 and upshift is 56 mph.



Do you have a stock tune to look at for comparison?

Usually the lower tps values (coast or light accel) shift early, and your upshifts are pretty flat in the lower ranges. You have to be getting on up there for it to upshift, even at very light throttle application. That shouldn't be causing the tcc issue, but it does cut down on driveability, unless you just like that revved up sound when coasting.

 

The 4th gear release is probably ok after all, since you have to get up to 60mph for it to lock. That will get you off the unlock threshold.

If we can concentrate on what gear and what tps, maybe we can spot something.

 

It's all 4th gear as I don't want it locking up in 3rd. The thing is, I don't know which cell it's in to concentrate on. The converter is loose and I'm gonna guess it's probably around 35% throttle or more. I will have to log it and see exactly where I'm at.

 

I found the cell you were referring to, but since it was only for 1200 rpm I seriously doubt that was it. I think next I'll try the VCM and command the converter to lock and we'll see where it is from there.

 

Here's another thing to try.

In 4th gear, after 50% tps, your release mph crosses over your apply mph.
Release is 56 and apply is 60, up to 50% tps.
But after 50% tps, the release mph (66) is higher than the apply (still 60).
That may be causing something goofy to happen.

Try bumping up the apply mph to be higher than the release.
Or lower the release from 66 back to 56.


And verifying the mechanical condition of the lockup via the vcm controls will be good info to know too...

 

Thanks for your suggestion, we noticed that and it makes sense why it wouldn't work. We've taken care of that oddball cell and have made some other changes, but haven't gotten to load them in the car yet. I think the gameplan is to take the car out again and command converter lockup via VCM controls and see if it's indeed in the tune or if it's mechanical. Keeping fingers crossed for tune.