95formulalt1

iTrader: (13)

At WOT the tranny should down shift right? well what if its not? its a new tranny and it does shift. what could make this happen? line presure, converter lock up, PCM, or shift points? would tuning help?



mike

performabuilt

iTrader: (25)

PCM controls all upshifts and downshifts so I would say a tuning or sensor issue. Of couse it wont downshift at any speed at WOT either.

95formulalt1

iTrader: (13)

what sensor could play a roll in it? i just installed a new MAF and that helped oput with the way it was runing big time. TPS is new.

95formulalt1

iTrader: (13)

and could this be why the car is like in limp mode??

95formulalt1

iTrader: (13)

ok just got off the phone with speartech and the pcm and wire harness are fine!! so what could it be?

performabuilt

iTrader: (25)

Do you have a stall and of so has the car been tuned for the stall,
And what trans is actually in the car? what year is the PCM being used, What year is the trans?

95formulalt1

iTrader: (13)

no stall. 02 4l60e. PCM is out of a 5.7 2000 camaro. spear tech did the tune.

performabuilt

iTrader: (25)

Well its sounds like the car is in limp mode, If so there should be some codes in the PCM to tell you why.

95formulalt1

iTrader: (13)

ya P0123 and P1365.

CalSpeedPerformance

iTrader: (64)

Its usually in the tune....

find a local tuner to mess with it if you can

95formulalt1

iTrader: (13)

ya i talked to pro street dyno in CT and slowhawk in MA. i waiting to hear back from slowhawk but prostreet doesnt thing a tune will fix it.

95formulalt1

iTrader: (13)

anybody know what could put it in limp mode??

performabuilt

iTrader: (25)

Ok the answers are there some of them in the codes
the_" P0123 - Throttle Position (TP) Sensor Circuit High Voltage" would affect everything from line presure to shift points.
The other code is not trans related.
You need to repair the TPS circuit and then get a scanner on there and watch whats being comanded by the PCM in data gear wise.

95formulalt1

iTrader: (13)

well i sent the wire harness back to spear tech and he could not find anything wrong with the wireing. so now im waiting for it to come back in the mail. should be here weds. i just got a new MAF. i know what the TPS is but where is the TPS circuit located?

performabuilt

iTrader: (25)

means all the wirng between the pcm and the tps

95formulalt1

iTrader: (13)

o so it should be all set then. speartech said that all the wires were right on and all work right. he tested the PCM and harness on his motor at the shop. so now im waiting for it to come in and i can install it.

so if the tranny is good and the wire harness is good then what could it be?? the answer is there some where!!!!!!

performabuilt

iTrader: (25)

well I would start by clearing codes and drive and then recheck codes

Stephen Griner

iTrader: (17)

Mine used to downshift to second at WOT at 50-60 mph but now I put a stall converter in it and it wont at 50-60. It will still downshift to first at around 25 though.

jimmyblue

iTrader: (11)

Turn the key on, mat the pedal with a voltmeter
on the TPS output (to ground) and read it. If
you are over 4.75V it will set the code and some
trans functions will act funny.

95formulalt1

iTrader: (13)

ill guess i will find out when the wireharness comes in.