Question
Le Mans Master
Joined: Oct 2014
Posts: 8,672
Likes: 2,726
From: Atlanta GA
The relearn process should be done FIRST , this process runs the clutches thru a series of tests to determine how much presure to apply to engage and also measure the time on how long it takes to disengage each clutch . After procedure is performed the tech should do a drive cycle varying speeds etc as the TCM is now in a learning phase measuring the RPM , Preasure ETC that it takes to make a perfect engagement each and every shift and also when placed into gear .
Your trans might shift funky for 50 miles or so while it's in this learning stage , I recommend that you drive it like you stole it
Then I can assure your trans will engage smoothly and shift perfect
Dave
Drifting
Joined: Jun 2015
Posts: 1,855
Likes: 694
From: Lagrange KY
Curious why starting out using the paddles seemed to alleviate the problem? Maybe because it was being held in 1st gear a bit longer before I shifted to 2nd? It appears that the 3x flush, had I had it performed, wouldn’t have helped any.
Le Mans Master
Joined: Oct 2014
Posts: 8,672
Likes: 2,726
From: Atlanta GA
AH, That’s it! That’s what I was thinking of in my post #2. Was thinking it had something to do with a part (valve body) needing to refill after a leak down overnight. So it’s a torque converter problem, not exactly a transmission one. My understanding is that can be a pretty costly fix.
Before you condemn anything , do the garage relearn that i mentioned above becaue there is a 95 % probability that this will solve your issue
Curious why starting out using the paddles seemed to alleviate the problem? Maybe because it was being held in 1st gear a bit longer before I shifted to 2nd? It appears that the 3x flush, had I had it performed, wouldn’t have helped any.
Dave
Drifting
Joined: Jun 2015
Posts: 1,855
Likes: 694
From: Lagrange KY
No not converter problem its a valve body problem that allows the converter to leak down
Before you condemn anything , do the garage relearn that i mentioned above becaue there is a 95 % probability that this will solve your issue
This is the tip off that i dont think you have any issues with converter leakdown and you need a garage relearn , yes it's because you are holding the gears and not allowing the TCM to shift it
Dave
Before you condemn anything , do the garage relearn that i mentioned above becaue there is a 95 % probability that this will solve your issue
This is the tip off that i dont think you have any issues with converter leakdown and you need a garage relearn , yes it's because you are holding the gears and not allowing the TCM to shift it
Dave
Team Owner
Joined: Sep 2000
Posts: 25,001
Likes: 2,701
From: Far NW 'burbs of Chicago
St. Jude Donor '13
I think there are several different issues with the A8:
Stutter/shudder under light throttle. The "redesigned" fluid is supposed to fix that, and it usually does.
Delayed/harsh engagement into D, usually on first drive of the day. Requires new part and expensive labor to fix.
Lurch on first 1-2 shift each day. That's the only problem we have, and the manual 1-2-1 shift mentioned in post #7 solves that for us. Any actual fix would have to be quick/easy/cheap, for me to bother.
Stutter/shudder under light throttle. The "redesigned" fluid is supposed to fix that, and it usually does.
Delayed/harsh engagement into D, usually on first drive of the day. Requires new part and expensive labor to fix.
Lurch on first 1-2 shift each day. That's the only problem we have, and the manual 1-2-1 shift mentioned in post #7 solves that for us. Any actual fix would have to be quick/easy/cheap, for me to bother.
Le Mans Master
Joined: Oct 2014
Posts: 8,672
Likes: 2,726
From: Atlanta GA
Anyone with HPtuners GDS2 or some other high end diagnostic tools can perform the procedure. I had 1st to 2nd shift flair... on both my C6 and my C7 . Ran the procedure and it cured the issue . I have done it for several of my friends that has hard downshift or upshift complaints and we were able to correct it for them .
Dave
