Dennis Ruffing

Another A8 heard from...

I've got the hunting in my 97 w.94k on the clock. -The usual symtoms; light throttle 40-55, "which gear do I want? which gear do I want!" I'm also the proud owner of the highway off-throttle thunk; ya learn to live with it...

I had a (first ever) tranny flush and filter 2 weeks ago. It was recoded to sport by Skiracer 1.5 years back. Car definitely shifts more smoothly and willingly, but hunting still there.

Could someone post a summary of the knowledge up until now? What paths have been explored, what different shops/ audi service centers have said, if anyone has licked it, and maybe a roll call on how many listers are suffering?

Thanks

Dennis

dennis.ruffing@ssaglobal.com

Jkay

new and rebuilt MAF sensors. Initially, the tranny is CURED .. then we don't know yet. Time will tell.

skiracer

00001 to 00011 and back again every 3 weeks or so. After every recode it seems that the hunt and thunk behaviour goes away fro a while. I think that the recode forces the TCU to start from scratch on its "learning". Unfortunately, I believe that the TCU is learning the wrong things.

Dennis Ruffing

Would you be willing to re-code me as a test?

And does the tranny un-learn if you unhook the battery for 1/2 an hour? That trick worked on my old subaru svx, a car also known for tranny problems and confusion.

It was a nice car though. I went from my '88 Audi 90 (235k! what a trooper!) to the SVX for a year or so to a 93 100cs into an accident (GRR!) into the A8. Yeah, I'm an Audi guy. Refinement at a low low price. My brother got a G35 sedan... I was disappointed; it ran rather crude and noisy.

skiracer

Let me know when you're around this weekend- I can meet you near by.

ryoung

Shouldn't the TCU stop learning when DSP is shut off?

<img src="http://www.audipages.com/Tech_Articles/auto_transmission/trannycodes1.JPG"><ul><li><a href="http://www.audipages.com/Tech_Articles/auto_transmission/codingtransmission.html">audipages Transmission Coding</a></li></ul>

svxit

Interesting. It looks like there are several (including myself) who own and A8 and SVX. Also, as many SVX owners have done in the past, I have been thinking about taking the A8 to Level 10 to see if they can sort it out, as they've done a good number of "bulletproof" SVX rebuilds.

skiracer

with any of the codings. DSP may turn off with the 11 and 12 codes, but I believe that the TCU still performs adaptations to the various inputs it gets.