Anyone feel free to post their ideas on this, it's something that came to me while discussing this. There are two different gear ratios for 94-95 cars, the 2.73 and the 3.23. The cars that have 2.73 only come with 2, D, and OD on the shifter and the 3.23 cars come with 1, 2, D, OD (I think this is correct, I know the 3.23 has a 1 on it, but maybe something is different in the 2, D, OD part). Anyways, I was thinking that perhaps this difference has something to do with why some cars have trouble with the high stalls for OBD1 whereas other cars are easily fixed with no problems. Perhaps there is something different in the programming of the 2.73 that is causing the problem (the car that I'm trying to fix for my friend for his high stall problem was originally 2.73 and nothing we've tried so far works). Maybe it's nothing, but other people who are having the same problem please say what gears your car originally came with from the factory. Maybe we can figure out the problem and finally solve it without going to OBD2.

 

GU2 in mine and in my buddies car. Mine now has 3.73s and a 3200 yank and his runs 3.42s and a 3500 vig. Both shift fine. It took a great deal of trial and error, even after having PCMforless do the initial bin.

Both cars shift at about 6,100rpm. A bit low...but consistent.

 

well my buddy just installed a 4500 stall (thought it was a 3500) and 3.73 gears. and it runs fine. iw ould shift where ever i wanted to. but he didnt like the drivablity of it so he went back with a 2800 ( i think).

 

what year are both cars??

 

I don't think that has anything to do with it.
The first rumor that I heard was that it was a vss issue.
Now Ed Wright has supposedly found a table in the code that has something to do with stall rpm and setting the car into some sort of a limp mode for the trans.
I have talked with Tunercat regarding this potential part of the code and haven't heard back.

 

GU2 is the code for 2.73 gears. I'm still curious to see the difference on Ed Wright's file, and what that limp mode trans table. I think we might have finally fixed flyinZ's problem, or at least it appears to be fine for now.

 

Just to be nosy, what did you do to fix it?

 

No problem Dan, happy to share what I do with other people! I actually combined Ion's file that he sent me with the original shift points that were on the PCMforless tune. Basically the normal kick up/down points were what was in Ion's file and the shift points were what PCMforless originally had on the tune. Seems to be working for now, flyinZ tried to get it to throw the code/short shift and so far it hasn't done it. Will this be permanent? Good question, I'm still not sure. Hopefully it will, but I'm not very knowledgeable about the auto tranny still (my manual doesn't make it easy to play around with the stuff and see what happens) and I'm still learning. If you want, I could send you a copy of the file and you can take a look at it if you want.

 

Please do. I'd like to see if what you did is different than what I do/have done.

 

I'll send it over when I get home in the morning, right now I'm at work.

 

But is does, Dan. It is an OBD1 issue.

 

Yeah, I know it's an OBDI issue.

His question was whether or not the rear end ratio that was originally in the car had anything to do with it. He further went on to ponder whether or not the fact that 2.73 equipped cars did not have a selectable 1st gear on the shifter had anything to do with it...thinking that maybe something was different in the programming between the 2.73 and 3.23 equipped cars.
The answer is no, that is not the cause of OBDI no shift problem. I have "fixed" a car that originally had 2.73's and a car that originally had 3.23's so I don't think what he was asking has anything to do with it.

 

anyone have the fix for the b body? i have emailed Ion and Bryan but i havent heard anything yet, and i got the problem now, bryan fixed my F body for me but i dont have a B body fix file...
TIA
Ryan

 

Are you sure that it would require different programming than an f-body?

 

Dan K, sorry about not sending the file today, it's on my laptop and for some reason it was having a problem with internet connection today. It's in the process of updating IE as we speak. I should be able to mail you the file in the morning when I get home from work. Can you send me your fixes for both 2.73 and 3.23 (if they are seperate files) so I can see what you did differently than me?