Hi guys, new to this forum and Audi, Just bought a 1999 A4 1.9TDi 110 with a full Audi sevice history and 153000 miles, car seems to drive great, But I had a look in the engine bay and seen a Dump valve?!, it does not even seem to functioning correctly under load, I want to remove but know little to nothing about these motors, can anyone help, I have a pic of it but not sure how to upload it? seems to say insert URL?