wkdspd

hey guys, need a little help plz, Ive been searching my a$$ off and cant find an answer...

'01 LS1 swap, stock motor and sensors/accessories, stock 4l60e...

Im getting a p0121 code which does not go away with a new sensor. when I punch it at ~40mph it does not downshift, it stays at cruising speed and quickly upshifts to OD and tries to stumble as the rpm's get lower and lower. punch it anywhere else and it runs strong like the LS1 should... I tried changing out a new tps, and I tried changing the min/max to 75/85 with no luck... plz help!!! thanks in advance...

2xLS1

iTrader: (25)

Have you tested the TPS with a voltmeter and verified that there is +5V, ground, and that the voltage on the blue wire sweeps from .5V to 4.xxV when you open the throttle?

wkdspd

I havent done it wth a voltmeter, but Im using HPTuners and when running the scanner with the key on and the engine off I can roll into the throttle and watch it go all the way to 100% with the pedal maxing at the same time the scanner reads 100%... would that be the same thing?

2xLS1

iTrader: (25)

Should be the same thing, but with unusual problems, it is best to verify all possibilities. Plus, it's easy to do.

wkdspd

tps checks out... any other ideas?

at ~40 mph punch it just kind of bogs down and lays over, and tps shows 100% while its just kind of bogging. it does it every once in a while from a stop as well. any other area in mph/rpm it will drop gears and haul a$$ - has anybody even heard of this? any ideas at all?

wkdspd

I just realized that MAP readings are staying at 13.34 cand higher... would this affect my issue?

HumpinSS

iTrader: (1)

even when you are just riving around the map sensor doesnt move.