I'm new to this forum having just bought a 2004 1.8T Quattro S Line Sport Avant. She's got 60k on the clock and is fabulous....except...there's a surge under hard acceleration.
Here's what happens: Accelerates good and hard through 1st gear, into second and she picks up nicely, then briefly flattens, before pulling well again. I have noticed it in the higher gears but the effect is more subtle. It's as though the turbo is being briefly eased off.
The chap I bought it from had noticed this and took it to an Audi dealer who said they couldn't find a problem when testing.
Any advice much appreciated...and since I'm more familiar with old V8s...an idea of where to look on the engine would also be much appreciated.
Many thanks in advance,