I've got an A4 that I don't drive but about once a week (sadly) because I live in NYC. Last night, I fired it up and the acceleration wasn't as responsive as usual. When I punched the gas, the engine took about one-half to a full second to respond, then hauled ass in a burst. I didn't let it warm up for more than about 30 seconds, which could explain the problem, but the owner's manual doesn't even recommend warming it up, so I never have. Is this just a regular symptom of cold weather, or an indication of something more severe? Anyone else with the 2.0 TSI had this problem?

Proper warm up - About 30 seconds of startup idle, then drive around *GENTLY* until engine temperature reaches normal.

Not-so-proper warm up - Long idle to wait for temperature to go up or rpm to drop to normal is not necessary. In fact it's *VERY BAD* for modern engines, as it generates an excessive amount of wear. Doing this would also not warm up the rest of the powertrain.

In any case, based on what you wrote, it sounds like the car hasn't fully warmed up yet, hence the sluggishness.

i agree with 'Moro is an Orange' completely. you need to warm up by driving, but gently to include all the essencial parts for the performance.
This sounds mosly like turbo was not at optimal temp yet.
warm up also includes warming up the turbo, hence you have to drive the car to get this to proper temp.

Note: driving with fast acceleration for couple minutes after warm up will tune your car for the way you drive improving the acceleration a bit, noticably though.

The ecu automatically adjusts the boost pressure depending on engine temperature and atmospheric temperature. When the engine is cold, you wont get the full boost. The 2.0T is a "smart" engine (which is another reason why so many tuners have difficulties tuning it).

i agree..one thing about the whole half second to a full second hesitaion when accelerating..ou also have to take into consideration that this engine has a 1 second delay on the throttle response due to the whole "smart" engine thing...when istart my car in the morning i notice the rpms are at 1.25-1.5..i let the car idle for like 30 seconds then the rpms drop to .75(where it should be)..the i drive it around...