SawyerA8

Hello All,

I just finished reading the thread on the transmission thumping and wow - we are making progress. Maybe in the next 6 months, if we keep brain storming on it we might find an answer. I have a 98 model and the thumping started around 80K, did everything suggested and still nothing.

What we know:

1. Replacing tranny fluid does not fix it
2. Replacing the tranny does not fix it

So the problem is not in the tranny.

Might be:

1. ECU programming - why would it change
2. Fuel being cut off to quickly
3. Torque convert slipping
4. ?

What about fuel filters?

I just think we can figure this out.

Thanks and I look forward to your thoughts.

Thanks,
Sawyer

Ross:D

I bought one on ebay last year. Search the archives for the procedure.

A8CT

I had a thumping which got progressively worse as I was driving the car home after just picking it up in Fla. Long story BUT it turned out to be the fuel pump relay which went bad. Every time I read about the thumping issues here, I couldn't help but think about what happened to me and that maybe it's not a transmission issue but rather a fuel problem. The symptoms that have been described were exactly as happened to me. The only difference is that I ultimately got stranded. Not an answer, but I agree that it might be worth looking at other systems (fuel, electrical) as well. What a huge victory it would be for everyone if it turned out to be something else...

Bob

KaMaKaZieP -ALUMIN8-

I say torque converter, but wouldnt those who has the tranny replaced replace the converter as well

Paldi

Wonder if the "pitch" of the torque converter is adjusted by the electronics?

KaMaKaZieP -ALUMIN8-

I still agree that it could be the MAF or ECU...

matrixabc

The other points I can think of would be the throttle possition sensor, air flow, air temp sensor...

Excellr-A8

My car was one of the first to start thumping back three years ago. I asked the forum back then but nobody had the problem at that time. I then took the car to Fred Baker Audi and they couldn't diagnose the problem after trying for several days. They ended up calling Germany and talking to the Audi/ZF technician.

They came back with the diagnosis that it was a defective torque converter. They said that they couldn't just replace the torque converter since the pump would start to leak. Their solution was to replace the whole transmission for about $9000. I wasn't prepared to spend this amount of money for a minor inconvenience.

I remember reading about a guy who had a transmission shop replace just his torque converter and it solved his thumping problem.

I suspect that the hunting is also caused by the torque converter but I am not as sure about this. For me the hunting is much more irritating than the thumping.

Jeff Bernstein

KaMaKaZieP -ALUMIN8-

I forget who it was but they had it done in Vermont for approx $1300

PaulW

On the A6's it has to be, there is a procedure on ross-tech.com but it doesn't work for our cars as I recall.

Somebody posted a month or so to turn on the ignition, and slowly press the accelerator pedal to the floor over a 30 second period and hold it, then slowly release it.....

I keep thinking I need to try that!