Auto Box Gear Change 'dip'!

[Guest kenji4444]

Hi,

I know it's bl**dy auto box probs again, but please can someone suggest why my Gal 2.3 auto '03 (AG4 box) is changing up from 2nd to 3rd with a slight 'dip', like a retard, on the change up. It changes up every other gear perfect, but the 2nd to 3rd change up always has this slight sort of retard - like the revs aren't matching the gear, ie too low revs. BTW, box has just been sorted with new looms and filled correctly with ATF by good mechanic. All faults cured, but this damned annoying change blip on the 2nd to 3rd change up!! :lol:

 

Please! - ken.

[Jouni]

Hi,

 

just found this old message with really familiar problem description and decided to push it up...

 

So, I've got a '99 2.3 Auto Galaxy (AG4 tranny) and everything has been working nice and steady except for the exactly same error as Ken described. So, the switching from 2nd to 3rd strokes quite a bit. I bought a VAG-COM cable and did factory-reset to the TCM. This fixed the problem, but only until the kick-down was used on the run! So, after a kick-down acceleration, the problem returned and after several kickdowns, the stroke went really afwul.

 

I've been on a rough way with this problem, a new TCM is installed (originally i suspected that the TCM would be causing the problem...) and finally the stroke during 2nd to 3rd switch developed so rude that a pressure impact had blown away some plastic cap in the box's valve body, and it dropped the oil pressure of the box --> clutch packs, some solenoids and turbine are now renewed... And still, the same problem exists! I really don't know what to do now... Only positive thing (narrowing possible causes) currently is that I was checking the TCM parameters after another reset for the box. I tried the Kick-down and suddenly the TCM stopped responding for a few seconds. And later on, the idle value for throttle position sensor had changed (temporarily) from 4.x% to 7.x%!

 

The one thing I'm yet about to do myself is getting a new throttle cable with the inline kick-down switch even though I find a little hard to believe that binary on/off information from kick-down would be somehow misbehaving. And if it won't help, I'll simply put a little pad underneath gas pedal, so that would mean no kick-down, but more reliable performance,

 

If anyone has even a faint clue about this kind of problem, I would really appreciate Your help with this. I like to drive the car, but I'm getting closer and closer to getting a rid of it... <_<

 

With Kind Regards from Finland,

Jouni