when your "bimmer" or porsche break it will be just as expensive. It's an awesome and I was indeed armed with the knowledge that if it breaks it's expensive. I.E. - The warranty!

 

I just purchased a 2006 A4. During my test drive at a dealer, I noticed something similar. I accelerated onto a freeway ~85 mph, maintained speed for a few seconds, and then punched the accelerator to see what high end acceleration was like. The car picked up (~95 mph), and then hesitated with rpms constant. I pulled over and let the salesman try to duplicate (which he couldn't). They took it to the shop and didn't find anything. The next day, I drove it again with the resident Audi expert. I was able to duplicate the problem while he was observing. He stated that the waste gate on the turbo charger was opening to prevent sending too much pressure to the engine. Problem never set a code and only occurred at the above speeds. Since normal driving conditions had no problems and I don't normally drive in the condition I was testing the vehicle, I purchased the vehicle (with extended warranty). The feeling I had during the event was that I was hitting a governor or something similar; not necessarily a mechanical mishap. Hope I didn't screw myself into believing what I wanted to believe.

 

That sounds very similar to my issue but, it did leave a code... If your in the US I wouldn't think there is a governor I knew there was an issue cause I've been far past 100mph before this happened.

Another thing I see now that it is fixed was it was hesitant at take off a little and now its much more responsive when you hit the gas pedal from stop. You may want to at least ask the expert Audi dude if it could be the boost recirculation valve I was having trouble with.

Good luck,
Jason

 

^^ As Above or also could also be coils/wires on the way out.

 

it cannot be a wastegated issues.....especially since you are recreating the same amount of boost at wherever the needle is on the tachometer in 2nd gear that you are in 5th or 6th gear....so you should have the same issues going 40 mph in 2nd that u do going 100 in 6th.....its just physically impossible for turbo to create more boost at a higher speed because the rpm's are a constant....that resident audi expert just lied to you

 

This is a known issue on the A4 - and is a simple TSB fix. See the pic.

 

I spent most of the day yesterday trying to duplicate the problem under different conditions (lucky I didn't get a speeding ticket). Anyway, I was actually able get the problem to recur at lower speeds (lowest was about 60 mph). The common trait was heavy acceleration demand (pedal on the floor). RPMs ramped up like expected, but at some point, they just leveled out with no output. My vehicle speed began dropping even as I continued to have the pedal on the floor for several seconds.

I'm taking the car in this week with TSB in hand. This has been a great discussion, thanks for all the input.

 

if your dealing with high rpms and a loss in speed traveled, even when the pedal is pushed all the way down. if its the wastegate letting off too much your boost would drop down real low, but you would still be motoring a 2.0 liter engine so you shouldn;t be losing speed but just accerlating more slowly,

you could have a tranny issue if your RPM's continued to climb but your car didn't go any faster

 

Tranny wasn't slipping, so I don't think it's a transmission problem. Just 10 minutes ago I did post a code. Haven't had the code read yet, but after looking at other posts on this board, I'm betting it is the similar problem with the cam lobe that drives the high pressure fuel pump. I found the related TSB that I'm taking to the dealer (too large post, but here's the link http://www.goapreu.com/support/20t_cam_wear.pdf ). Just wish the dealer would have been as helpful as members on this board.

 

Do yourself a favor, call an Audi dealer, speak to a parts dept, ask them something along these lines.

I have a VIN, and I'm trying to narrow down a solution for a problem i'm facing. If I give you the VIN, can you tell me which part I have? (Intake cam etc etc) that's on your TSB.

I believe you're looking for the part that ends in B. - the older A ones were not properly heat treated, thus causing a lot of expensive problems....