URGENT: Tiptronic problems RS6 C5

[PatrickRS6]

Sorry for the topic title, but this is really urgent.I have problems with my RS6 Avant from 2003.
In February, a new torque converter was placed, and the gearbox overhauled.

Now there are problems with the tranny since Friday, and next Sunday we start with 50 cars for a roadtrip to Italy (from the Netherlands) (eg for a charity to support).

The problems started with a rather abrupt way to switch back to 1.
Then it got worse, when i drove towards a red traffic light, let the car roll, and will accelerate again because it becomes green, the car revved, and he only "engaged gear" when the throttle is released. It also comes with a hard smack through the car when it engages gear.

Barely used the car and got it at the company where it was in February. And now he is completely cooked. On most crazy moments (driving away, acceleration orjust after switching gear) it doesn't engage gear. The motor revvs, but the car is not accelerating. Vagcom says at that moment that the torque converter is in "open" status. The blow (when the tranny comes into gear) is equivalent to switching the torque converter to "regulating" in VAGCOM.

What also is new since yesterday, when driving in Manual mode (I only drove the car in Manual since the problem started because the gear selecting is only when i want it to), the car suddenly went off selecting all gears, while we drove it at ~ 15km / h, the car would not go faster (no drive). He switched step by step from1 to 5, only on the display. Soon thereafter he went into Limp Mode.

The car is reset, and then with ~ 15kmu drove back to the garage (by the technician, this was during his test drive).
Who can help me? I need al info i can get to get the car on the starting grid by Sunday. The car shows no faults (no check engine light, vagcom has 0 errors), gearbox overhauled ~ 20,000 km ago. Torque converter was also newly installed.

[Keaney]

I'd be on the phone to Grizz first thing tomorrow mate.

Without being a mechanic myself it sounds like either the tc or clutch pack maybe, the fact it went into limp mode makes me think tc.

Was there any fault codes on vag?

Good luck and I hope something simple like a gearbox flush might solve your problem

[PatrickRS6]

Well, i'm located in Holland, and my English isnt that good on the phone haha.
No fault codes in Vagcom...

[Keaney]

Nightmare! Thats a long drive to unit20.

Hopefully someone on here will help you but without seeig the car it could be a lot of guessing and head scratching

[PatrickRS6]

The car is at a tranny specialist right now, they've had multiple RS6's in before, so they are familour with the cars and their problems.
But i'm hoping someone had exactly the same issue ...

[Shoppinit]

Sounds like low ATF pressure to me. Could be low fluid level or a problem in the valve body meaning ATF pressure isn't getting to where it's supposed to.

Slamming into gear normally means that the clutch packs are toast, but if there's not enough pressure to hold on, then they'll slip too. Yuo say the box was refurbed recently, so hopefully it's not this (or they took you for a ride).

Keep us up to date.

[Drummerman]

Sorry to hear that. That is exactly what happened to mine. Changing the gearbox oil helped but it still wasn't right. Gearbox out and stripped and apparently out of six clutches - 4 were totally worn out ( I think that is how they explained it). So full gearbox and new TC.

[mavada]

that sucks...try Coen Donkers...

[imacool]

It looks like low ATF (gearbox oil). Looking into the history of my car the previous owner had similar problem. The gearbox was serviced (new seals, new AFT) and then 2-3 months later he reported lack of drive. Audi checked the box and found one seal leaking. They replaced it, topped up fluid and no problems since. That was 4 years ago.
So I woud lift the car and look for leak over the gearbox area.

Sorry to hear that, hope you get it sorted for your charity trip!

[PatrickRS6]

Got this reply on the other RS6 forum:
"Too much endplay in the trans have the same sympthoms. There is a trust bearing behind the second clutch that brakes over time if the trans endplay wasn't shimmed right. It has to be rebuild again."

The car is still in the Shop, phoned them twice today, just before they closed they told me they where test driving the car after placing a new 'brain' in the trans (not the TCU but the mechanical thing in the trans).
Will get an update in a hour of 8.... leaving me waiting by the phone.

[Shoppinit]

They are talking about the valve body when they say brain.

[Shoppinit]

This is why I think it's better to get an exchange box from Audi or ZF. When people "rebuild" you don't know what they change out and what they don't.

[bam_bam]

This is why I think it's better to get an exchange box from Audi or ZF. When people "rebuild" you don't know what they change out and what they don't.

+1
I drove all the way to Sussex and quizzed the tech who rebuilt m gearbox, only then did I find out that the VB was left untouched. You get a better quality of answer when you ask face-to-face.

[PatrickRS6]

I wanted to have it done the first time @ ZF, i'm not that far from their HQ... but they are so busy, i'd have to wait weeks.
My RS6 is now in under warranty, but not finished in time.
When it's done, it will be replaced by something else, more reliable.
(Own it since 11-11-11: IC's leak, O2 sensor faulty, TC died, DRC died, headlight washer broke, etc etc)
Bought it with 147.000 km on it, now 174.000km

[Shoppinit]

Sounds about par for the course.