147 bizarre noises
I have a 147 1.6l Lusso which is an 03 plate and has clocked around 38000 miles. I've been the owner for what is coming up to a year, and the car has had no known problems before, and no problems since I've had it. I had the car serviced 2 months ago, and pretty soon after noticed a problem. When I start the engine, the car starts up normally for around 5-10 seconds, and then begins a loud grinding sound under the bonnet. The noise will continue as I put it into gear, and won't stop until I've reached a reasonable speed (8-10mph in 1st gear) before it falls silent. When I change up, the noise comes back, and does this in third gear also until I've reached a high enough speed for each respective gear. After driving for a while, the noise will desist, but come back intermittently when travelling at lower speeds. I have absolutely no idea what this is and not sure how worried I should be!
Is there anyone who knows what the problem might be, and how best to go about correcting the issue?