BTLD_LS1

iTrader: (1)

I took the car out to the track last night and the transmission was acting up the whole night and i have no idea why.

First pass of the night I pulled second gear only to watch the A/F on the wide band to make sure everything looked good, stayed richer than 11.8:1 on the wideband the whole time, so all was good and decided to come around and make a second pass. Put the car in manual first launched, the car immediately shifted to second upon launch, I was going no faster than 10-15 MPH as this point. Came around made a second pass in OD to see what would happen, same result.

I went in to the tune and reset all the tables to stock with the exception of full throttle shift RPM and Full throttle enable %. Made another pass, (as seen in the log) put the car in manual low and the car held first a little longer, still shifted to 2nd on its own earlier than 7000 RPM.

Came around made another pass, this one at frame 2240, with the car again in manual 1st, and the transmission shifted to second early, then back to first, then back to second, then back to first, and then to second and proceeded to stay in second.

Im running a 5K RPM non lock-up converter and a Performabuilt Level II transmission.

Any ideas? i have never experienced anything like this before.

BTLD_LS1

iTrader: (1)

the car will do a burn out in first and NOT shift to second on its own, also on the street, if u manually pull it down to first it will hold first til u shift it as well, only appears to happen when launch from a dead stop

Frost

iTrader: (45)

Looks like a DTC thang. Give this file a try; I am fairly sure that unless you have a trans issue that this will fix the shifting. Yep, it's a 98 thing (P0121). Your TCC table would be miserable with that stall and cam. I made a quick tweak to that and your part throttle shifting (that looked miserable too) while I was in there.

BTLD_LS1

iTrader: (1)

Hey frost, thanks for the input and changes, ill give this a try. Again,I did reset essentially everything to stock here to try to see if I had fucked somethin up. Hey, can you explain what the tcc table has to do with it as I'm running a non lock-up converter?

Thanks again ill let u know

BTLD_LS1

iTrader: (1)

Hey, the file u uploaded looks to be corrupt, can u try again?

Frost

iTrader: (45)

It's not corrupt, you need a newer beta of HPTuner's to open it (assuming you got the index outside of array error).

I didn't realize it was a non-lockup stall.

BTLD_LS1

iTrader: (1)

Frost, I just wanted to say thank you again. I plugged the P0121 values in to my original tune and for the first time, in I'd say 5 years, the car actually shifted right when being left in over drive! I thought all along it was due to the converter and tranny mods I was running.

THANK YOU!

Frost

iTrader: (45)

Glad to hear that gets you going. Years ago the first time I ran into this, it was such a PITA that I absolutely never forgot about it.