Problem with 4T45E tranny on 02 GA GT

[AznGA]

During acceleration, my RPM jumps up and down when the car is trying to shift into 4th. It finally shifts when I press the gas pedal little more. Any ideas?

[korbendallas68]

Checked your fluid level?

Might be a TCC problem also.

[AznGA]

What exactly could be the problem with TCC?

[korbendallas68]

Hmm, well, most symptoms of TCC failure is a jerky car... Sometimes TCC's just fail to work. It's replacable, but I'd bet it's something else.

[AznGA]

Well, I have had this problem for long time. I disconnected the battery and let it sit for a while, and after that, the car shifted differently, and the jerky problem came back again.

[sharkey]

disconecting the battery clears the pcm's memory, and it will have to do the "self adaped" again. all electronic transmissions learn your driving habits (if your a lead foot or a grandma) so it will shift the way you drive. if your a leadfoot, you will have later and more firm shifts. if your a grandma, you will have early, soft shifts. when you disconect the battery, the ecm needs to learn it all over again so it will shift funny for a while (usualy firm) till it learns your driving habbits.

oh yea, it also can componsate for wear in the tranny.

[AznGA]

Ya, I understand that the car learns how I drive and shifts accordingly. The funny thing is, I disconnected the battery, let it sit for a while, and then reconnected it after I discovered this problem. The problem was gone, but after I drove it for about 3 weeks, same problem came right back.

[korbendallas68]

Do you have any mods do to it? Shift enhancer, ect?

May be it's not the transmission, the trans runs off of other sensors too, so maybe like a speed sensor or something? Like it can't decide when to lock-up the torque converter...

[AznGA]

All I have under hood is intake, Taylor spark plug wires and NGK plugs.

[korbendallas68]

Do any SES codes come up?

It's really hard to say what s wrong with it.

[AznGA]

No lights on cluster.

[AznGA]

UPDATE:

I got my tranny flushed and it's a lot better, but it still does it once in a while.

[korbendallas68]

Hmm. And it still does it? Maybe there's a faulty sensor. It's hard to diagnose over the net.

You're Korean right?

[AznGA]

Yes I am. Are you? How did you know?

[korbendallas68]

Me? No. I wish I was! lol, but ya, my beautiful girlfriend is! Full-Korean. She moved here 6 years ago think. We live in awesome part of the cities here, a couple of Korean stores, and an awesome restaurant. She's always teaching me how to speak it too.

I remember your name from GAGT.com.