Odd Noise

[ulfilias]

Hi Guys,

Been running arround in my S8 for a while and things have been reasonably fine. Had an engine light come on a little while back and it was a pre cat lamda sensor and then the maf (though swapping a maf a year back, admitedly to an aftermarket one, this took some finding).

I then had a bank1 timing sensor adjustment error left and so lumpy running and then noticed when at low speed there is a nasty chain like sound and popped it in to my mechanic friend.

He has just come back to me, saying that the sound is comming from the back end, it doesn't vary with revs and he thinks it is the Torque Convertor or Flexiplate ????

I never thought to look at the transmition for errors, was just checking the engine.

I know driving was sluggish like running on half an engine...

Any ideas what to do....what options are etc ???

Thanks,
Lee