Hi, I have a 56 plate Fusion 1.4 TDCI Zetec (35k miles) which I've had for about 2 1/2 months and over the last few days I've started hearing an odd noise like compressed air when under moderate to harsh acceleration. It usually only occurs when I'm already doing about 40+ mph. If I just cruise then it seems okay. I doesn't feel like it's loosing power and there isn't any black smoke that I can see. I took it back to the garage and they said that checked the pipes but couldn't find any problems. I'm hoping it isn't the turbo as I don't think it's covered under warranty. One other thing to note is that it can smell abit "engine like" in the cabin if I have the air vents open but less so if I have it on re-circulate. Any idea's ?