My 98 1.6 16v Astra Arctic 2 is making an odd muffled noise when in 1st 2nd and 3rd (basically when revving).
Also when I first start the car and rev there is a muffled growl which seems to go after a short distance.
It seems to be running ok and I have just checked the oil etc.
I have no idea what to check....any ideas?
I know this is a bit vague but I am still quite new to cars!