Delayed acceleration update
Burning Brakes
Joined: Apr 2001
Posts: 773
Likes: 107
From: NC
At slightly over 1700 miles the trans in my '08 A6 began to take a long time to shift from reverse to drive, sometimes as long as 6 seconds. Then it began to slip and was very sluggish when driving away from a dead stop. I barely got it to the dealer . They everntually replaced the transmission control module, BTW there is a bulletin out from GM on just this problem. The car didn't seem the same to me after I got it back, so I took it back and they checked it over and said it is fine, no codes. But the car now seems to hesitate more, as if it is trying to decide what gear it wants to be in. It is especailly noticable after slowing down to, say go over a speed bump, then accelerate back up to speed, even my wife commented on it last week. I am not talking punching, it, just normal driving. As I read the above posts, it seem clear that a tune will cure many, if not all, of the "problems" with the A6. I may wait for this now software from GM before I invest in a tune, I am naturally gun shy about losing my warranty after already having to use it.
Thread Starter
Heel & Toe
Joined: Apr 2008
Posts: 17
Likes: 0
From: Wakefield MA
GM software vs Tune
I was told that the typical dealership service department will not freak out over the change in programming. Naturally, you would have established a good relationship with the mechanic...thats always a good idea. They usually have one guy that is their in-house vette guy. You could also consider a HyperTech programmer. I had one for my 2001 A/T it drastically improved performance, in fact the time listed on my profile pic was done in epping new hampshire..it was my first time trying the 1/4 mile, offically. I used the Hyper and adusted shift points, it was very easy to do. BTW im in possession of the 08 A6 that has had its engine replaced and it still hestitates a little, but does shift better. Good luck.
Safety Car
Joined: Dec 2004
Posts: 3,565
Likes: 5
From: stafford country, va. Avatar: Me on turn 3 @ Bristol (The World's Fastest Half-Mile)
dang....what luck. i need you around when i buy a lottery ticket. just imagine the tsb.
technical service bulletin for delayed acceleration.
problem: driver experiences delayed acceleration in automatic transmission vehicles.
resolution: replace vehicle with manual transmission version.
simply priceless.
technical service bulletin for delayed acceleration.
problem: driver experiences delayed acceleration in automatic transmission vehicles.
resolution: replace vehicle with manual transmission version.
simply priceless.
Thread Starter
Heel & Toe
Joined: Apr 2008
Posts: 17
Likes: 0
From: Wakefield MA
delayed acceleration Plus
Rofl...i will pick lottery numbers for you anytime, but the car was replaced because of the porous engine block and chronic oil leak. Remember, the engine was replaced and who would want that vette with a replaced engine with 700 miles?
Thread Starter
Heel & Toe
Joined: Apr 2008
Posts: 17
Likes: 0
From: Wakefield MA
The Verdict is in!
Update on the 08 with A6 with delayed acceleration. Dealership replaced engine with 700 mi returned car to me. I waited 6 weeks for GM to do the paperwork and they bought the car back lat week. I took delivery of an 08 manual, almost identical, except with the Appearance pack and Nav and paid the difference to the Dealership. The car is awesome. You were right! The manual is fun and better all around for me. The auto trans are awesome as well if u got a good one, if not, you might try some prayer time with the calls to the dealership. God is Good!
5th Gear
Joined: Apr 2007
Posts: 5
Likes: 0
porous engine
This means that the casting has porosity. This is a condition where the casting walll structure has defects cause by gas holes or internal shrinkage allowing fuild to pass thur. I'm a casting foundryman.
Team Owner
Joined: Jun 2005
Posts: 46,295
Likes: 2,596
From: Northern, VA
St. Jude Donor '15
"In honor of jpee"
And for others, you get a tune, and the "mechanic", aka the Corvette Tech at the dealership, is cool with it.
He's cool with it as long as there's no warranty work even remotely related to the tune. If your engine fails, if your trans craps out on you, if you blow a differential, if you break a halfshaft, you really think they're just gonna shrug their shoulders and say, yeah, that's a "warranty issue, we gotta put in new parts for free."
Well, maybe they will. And maybe not. Your decision as to playing and paying.
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Safety Car
Joined: Sep 2000
Posts: 3,604
Likes: 394
From: Austin, TX
Actually, of course its not funny at all for someone who is unfortunate enough to get one. Glad this one worked out for the OP.
Thread Starter
Heel & Toe
Joined: Apr 2008
Posts: 17
Likes: 0
From: Wakefield MA
Hmm
Thanks for all the feedback. I think your right, the dealership would never honor a warranty issue with a tune in place! Its easy for them to make that kind of statement before the problem lol.
That is very interesting about the porous block manufacture process. You woould that it would have been picked up at the factory, or the dealership. I guess they just look the other way!
That is very interesting about the porous block manufacture process. You woould that it would have been picked up at the factory, or the dealership. I guess they just look the other way!
Burning Brakes
Joined: Jul 2007
Posts: 966
Likes: 14
From: Chicago IL
We had been talking about a delay in acceleration in the 08 A6. A couple of members reported this problem, which was identicle to mine. The dealership finally did a black box analysis while experiencing the 1-2 second delay or bog. They sent it to GM and after analysis GM saod it was a characterisic of the car, hmm. Yes, its ok to delay 1-2 seconds. Well, GM said there would be a software update in 6 months. Then the car developed an oil leak. After several attemots to replace the pan, they determined it was a porous. Yes, you heard me a porous block and they will replace the engine with only 700 miles on this baby. Needlees to say after i motioned to drive the vehicle through the front window lol, they agreed to replace the car. I think im going to try the manual...any thoughts?
Thread Starter
Heel & Toe
Joined: Apr 2008
Posts: 17
Likes: 0
From: Wakefield MA
Delayed shifting
The delay in shifting is what GM called the unacceptable bogging in acceleration that it seems some A6 owners experience. It occurs at any speed, except from a stop. There is between a 1 and 2 second hesitation that i had. GM rep said it was a "characteristic of the car". The tech said the transmission is searching for the gear lolol. All i know is that it took replacing the A6 with a manual to solve the problem.
Le Mans Master
Joined: Jun 2007
Posts: 7,610
Likes: 12
Safety Car
Joined: Jan 2006
Posts: 4,598
Likes: 78
From: Miami FL
2020 C6 of the Year Finalist - Unmodified
St. Jude Donor '08-'09-'10-'11-'12-'13-'14-'15-'16,'17,'18-'19-'20-'21-'22
All is well that ends well, and really well if you end up with the New manual transmission. 
Thread Starter
Heel & Toe
Joined: Apr 2008
Posts: 17
Likes: 0
From: Wakefield MA
Update on replacement
So its been two weeks with the manual and i gotta tell u its awesome. Flawless in every way. These 08's are just remarkable! Gentle when u want them to be that way, but a beast ready to be let loose lol. Thanks to all who gave their opinions and advice especially AORoads. This may make some interesting discussion? Does GM monitor this site rofl
