Mr. Trick

iTrader: (19)

I recently got my car tuned and it ran great for a couple days and was shifting at 6700 rpm like it is tuned to do so, now for some reason it shifts around 6300. The car is not throwing any codes and the tps reads 99% when pressed to wot. What could be causing this? The only thing I did after the tune was pull the abs fuses because the car has 26s in the front and 28s in the rear.

mrvedit

WOT uses a different shift table than partial throttle.
The % throttle for WOT can be tuned too. While I set it to 95%, perhaps your tuner set it to 100% and you are now only reaching 99%. The TPS generally has some adjustability; adjust it so that WOT gives you 100%, assuming the throttle really is opening all the way.

murphinator

iTrader: (2)

to command a shift you need to reach both set speed and rpm , your speed is possibly off because of tire height change, been a while since I have done any tuning but I would look at that also...

Mr. Trick

iTrader: (19)

The car was tuned with the 26s and 28s. I did notice one of the front speed sensor wires got loose and was hanging, could it be possible that it got damaged and is screwing everything up? Or does it matter since the abs fuses are pulled? I'm kinda just spit balling here cause its frustrating me cause it was running spot on and just changed overnight. I will also check the tps and see if I can get it to read 100%.

Mr. Trick

iTrader: (19)

I just noticed my redline moved down 400 rpm also. So I'm guessing this is more of a tps problem. I dont get it.

mrvedit

Only a change in tune can change the redline.
I just checked a stock 2002 tune and the WOT shift tables are used at 94% throttle and above. It might be time to check with your tuner.

flame

iTrader: (13)

If you are going by your dash tach there is your problem. The pcm rpm signal is what you need to look at. ABS speed has nothing to do with the transmission it uses the speed sensor on the trans.

Mr. Trick

iTrader: (19)

I have an autometer digital tach, so that is what I am going by. It was shifting at 67 according to the autometer tach and now its shifting at 63.

murphinator

iTrader: (2)

one thing for sure you want to go by the obd2 datastream if your trying to dial in rpm or you will chase your tail , less on a more accurate aftermarket guage than the oem one but the pcm is going to command a shift based on the data its recieving from sensors such as crank position sensor

Mr. Trick

iTrader: (19)

So I gotta datalog it basically correct? Unfortunetly I dont have the software to do that...yet. I am working on it though. I've been messing with the idle set screw on my TB cause my tuner said they are notorious for moving and screwing things up. He told me to put lock tight on it, and like an idiot I didnt listen and took the car out, and I did notice it does move some cause I indexed it.

edit, also if it makes a differance my MAF is descreened, but it was done before tuning it.

Mr. Trick

iTrader: (19)

Sorry to bump this thread. I noticed the upper shell of my fast intake is not sealed right, could this be causing my shifting problem? the 1-2 shift has dropped some again and I noticed my redline is at 7070. I belive it what set to be at 7200 but I dont 100% remember.

flattusmaximus78

iTrader: (1)

A vac leak can cause a lot of funky things.

Also incorrect speed and rpm settings will make things real fucky.