Sorry for this being my first post but hopefully someone on here can shed some light on this....
Here's the scenario-
Driving along in D doing about 40-50mph, pull out to pass slower traffic in front and apply some gentle throttle.
Where i would expect the gearbox to go down one gear and pull cleanly, the car hunts for the right gear as if it can't make up its mind.
We make forward motion but not cleanly, the engine hunting, the car lurching forward but not violently.
If i let my foot off the throtle and reapply it seems to clear itself, either selecting a lower gear or if it doesn't need it pulling cleanly away.
None of these things happen if i use the paddles to select a lower gear or am in tiptro.
Also when flooring the throttle from standstill or very low speeds the revs rise with very little forward motion and then the gearbox catches up and off we go.
No trans fault codes shows up on a VAGCOM scan.
I gave the gearbox a service a couple of weeks ago but it has made no difference.
I have done some live logs and converted them to graphs which i have attached for anyone interested to have a look at.
In the file Gearbox graphs:
Blue - Engine speed
Red - Transmission input speed
Yellow - Speed (km/h)
Green - TC slip speed
The ATF temp was between 48 and 55 degrees C when i did this.
The top graph was 3rd,4th and 5th gear if i remember correctly, the bottom graph is all in 4th gear.
In the file Gearbox graph 2:
Blue - Engine speed
Red - Transmission input speed
Yellow - Transmission output speed
Green - Speed (km/h)
Maroon - TC slip speed
ATF temp was between 64 and 78 degrees C.
This time it was heavy throttle from standstill, not quite wide open throttle, but close.
When throttle was applied the revs rose quickly but it wasn't accompanied by massive forward motion, seemed to take a moment or two for the gearbox to catch up - felt like a slipping clutch if it had been a manual.
Engine speed and trans input speed traces seem very closely linked which would seem to suggest TC is OK but is the TC slip speed trace too high?
Anybody have any thoughts?
Would love to be able to diagnose the source of the problem.