From what i've been able to figure out so far, the OBD1 high stall problem can often be a few different things. I'll try and break it down into what I've been able to gather so far so that others can find it all in one post... If anyone has any corrections or anything to add please post below and I'll try and update to match

Most people report hitting their rev limiter and the car skipping 2nd and throwing a code (dtc 24 ) while staying in 3rd.

Have you changed your tire sizes or rear gear ratio when this occurs? If so you will need to ensure that you have your computer properly set for your gears (Use the speed calibration option in tunercat) and tires. Hitting your Rev will trigger dtc 24 from what I can tell ( source )

Once you have those parameters properly set your ready to begin fixing your high stall problem.

-Most thread suggest adjusting the up/down shift points lower, giving your engine less chance of tipping the rev limit.
-You can alternativly adjust the fuel cutoff rpm to something higher if your valvtrain is ok with that. (Someone needs to verify this)
-TCC (Torque Converter Clutch) points for some converters may also need to be changed so that lockup occurs at the correct RPM.
-Programming out DTC 24 seems more like a bandaid to me..
-If you installed new gears you will probably have to SCALE all of your shift point tables (both Up and down) as well to match the new gears.
-Finally, you can help out your new converter by upping the tranny line pressure tables slightly. (need somone to verify if this works as well to fix the high stall issue)

The looser the converter the more prominent the problems, and the more likely your getting the "stuck in 3rd gear + error code" symptom.

I hope this helps some people, it's only a bunch of notes i took from other threads. Feel free to send me any corrections so i can update the main body.

 

I've got two files here, one from a car with the fix and the other is mine. I've noticed some significant changes on some tables/values and some that are off a tiny bit. I've seen small variences between even stock cars, so I'm assuming only the values with large changes are the true fix. Ofcourse, I have no way of testing it out 'cos I dont have a convertor yet ... if it works, I'll help you'll out. Ofcourse, I dont have the liberty of comming out with it (just like everybody else) since it is in a way or form, the interlectual right of the person who tuned it ... but like most people here, I will help!

 

Screw that! .... it's not like it's a big secret. Everyone knows it and acts like its some big conspiracy. I'm not trying to make money here, just to help a brother out! Here's what I know for now.
Turn the Low PRNDL shift threshold to real high (like 255) on the constants table and on the shift tables (normal/performance/kickdown), 1-2 shifts as low as you can and the 2-1 lower than that (1 and 0?). That's what I know so far, I maybe missing some parts of the complete fix but I've not tested this out yet 'cos I'm still looking for a stall TC but if someone can check it out and let us know if it's really the fix, that would be appreciated.

... I know I know, you're most welcome

 

You're on the right track, sort of.

I'm not going to give everything away as a lot of people have done a lot of research and testing. Sorry, but I can't do that. Plus I'm not totally sure how I've done it in the past will fix every car. So I'm not going to come out and say "this is how to fix the OBDI high stall problem". But so far I'm 8 for 8, as far as I know.
In order for the pcm to complete a shift it needs to see the value in the rpm threshold and in the mph shown in the mph tables. On a hard launch, the vss "loses" signal. Take the vss signal out of the equation and you should see a shift based on rpm.
You are adjusting your wot shifts based on rpm aren't you?

Edited (twice) cause I like to type mph where I should type rpm.

 

I think i did it a lil bit differnet, I agree with the VSS losing signal or seeing a great amount of slip in the tranny due to the difference between input and out put rpm ineffect putting the tranny into limp home mode and automatically going into 3rd. I can't remember exactley but I think I set the WOT shifts points low in mph (1-2 5mph) and then setting the actual shift point with the rpm threshold. Seems to work for me.

 

is will fix some of them but not all of them.


im not trying to be a butthole. but i was ask not to tell. so i dont tell.

but yall are on the right track and if yall look at what dank said. and go from there yall will get.

 

I understand what you say, I'm just trying to make sure myself 'cos I know I'm gonna be in that predecament in the near future and would like to know how to fix it myself. I don't like the idea, although sometimes it's the only way, of having to send my tune out and getting a tune 'cos that leaves me out of the loop on my own car. Call me ****, but I like to know exactly what was done to fix or tune my car. I guess that's the engineer in me, we always want to know how and why and all that other crap that the layman doesn't care about.

 

I would suggest we try some of these things in the post one by one with tunercat. Then come back and report on the results once youve been able to drive it for a bit. ..

They key problem seems to be DTC24 code... so take care to make sure the rev limiter doesnt hit and maybe set the shifts a bit sooner (or rev limit a bit higher) and see if that code dissapears. Then if there are still any outstanding problems at least well be a bit closer if it helps...

 

Update 2 links:
http://web.camaross.com/forums/showt...+stall+problem

http://web.camaross.com/forums/showthread.php?t=403747

This is from Dan k:
There is no trick to fixing it. On a hard launch, the vss loses signal and the computer goes into "limp" mode.
You need to make it so that the pcm doesn't use the vss for it's wot shift calculation.

So similar to his above post, that looks like the heart of the problem I just got me a 2800 yank, so I won't be able to test it myself... I think tonight i'll try and track down how to remove the VSS from the equation in tunercat and update this thread with my "guess"