first off thank you for the quick replies. I actually found that the problem was with the TCU (transmision control unit), thanks to you guys. Seems 4EAT is smarter than people give it credit for. I actually found out it has a performance map which is updated depending on how you drive it. It actually updates pretty quickly, maybe after 4-6 hours of driving?
Originally Posted By: gathermewool
Have you checked your fluid levels?
You're beating that 2.5i more than most, but not necessarily to the point of causing damage. I've manually shifted autos in the past and been able to do so smoothly. I've also seen others do it, and it's a very uncomfortable, jerky ride. Like a manual, there are good and bad ways to manually shift an auto.
With that said, the 4EAT is ancient and pretty robust, so hopefully your issues stem from something simple and benign.
I'd never knock another man's lube habits, but I will say that were your 2.5i mine, I'd be extending out AT LEAST the diff fluid changes by > 4X longer than what you're currently doing. Your AWD system has open diffs in the front and rear, so it's not really working too hard to transfer traction. Harder than usual driving, IMO, would not require changes as frequently as a Scubie with LSD's.
Finally, and this is semantics, but your system is AWD, not 4WD.
it's not a 2.5i, it's a 2.5GT, which is basically a WRX. It has the VTD all wheel drive system, which is more complicated than those found on the N/A versions. Has limited slip difs at rear and a center diff. I only drain and refil once. I do Not do the 3x3 drain and refil (drain once, refill, drive around...repeat 3 times). Fluid levels are good.
Originally Posted By: Fleetmon
Plus, how are you changing the fluid....if you're going with a "flush" then you might be detracting from your trans.
no flushing, I know that is not good, I followed the service manual suggestions.
Originally Posted By: antiqueshell
Originally Posted By: lexus114
If it were my vehicle, I would clear the ecm via a scanner. Bet it smooth`s it out. (not a fan of the disconnecting the battery) but if it is the only way you can do it. Do it.
Good point a lot of people either don't realize or forget how important the trans control module is to modern automatic box performance.
This is a simple and quick thing to do. It could instantly solve your problem at NO cost and only a few minutes of your time.
Yep, I just drove the car around smoothly and with light throttle touches and after 2 days now the shifting has gone back to normal. Smooth but slower now (i think it blips the throttle, that's why it seems slower?).
