Looking at buyingthis car, the one that i have seen has a strange noise that can be described as suction noise, it happens when the car is standing and you accelerate and as you let go there is a suction noise coming from the engine. Is this noise normal for this car. I havent test drove the car yet so dont know if it will happen when driving. I know my friend has a saloon 2.5 tdi and it definitely doesnt make this very obvious noise. Could it be coming from th Turbo, it like air being sucked but it is very loud.

I posted this message on HonestJohn forum and had a response from someone who worked at audi and thought it was quiet normal for these engines from his experience. Another person asked if it has a duno valve, is a dump valve the same as a vibrating damper? because when i asked for a quote for the timing chain today I was asked if the car has a vibrating damper as that would also need to be changed with the belt.

Any Help appreciated, thanks