I wonder if any of you can help me......
I've developed some kind of fault on my Audi A4 Avant, it's a 1.9 TDI 110 (AFN).
It revs on it's own on startup, smokes quite a lot when it starts, but this then disappears, and I appear to have a complete lack of boost...!
There seems to be boost at low RPM, and I can hear the turbo doing its thing, but when I should get a massive boost, it's like it's not there and the wastegate is all the way open.
I stupidly consulted the Haynes book, their diagnosis is possible injector fault although it runs ok, doesn't sound like it's only running on 3, and fires all the way through the range, just seems to have no boost!
I have suffered with overboost before, but this is different, an switch off/switch on doesn't work! All the hoses are present and correct, and none of them have any holes in.
I'm totally at my wits end, and I REALLY need the car working properly!
Any advice would be most helpful thanks everyone!