The 156 1.9 JTD had started making a very odd noise.

Started yesterday, under heavy throttle, a sort of
shhhshhsshshs noise, best I can describe it is like the
noise of waves receding on a pebble beach.

Only happens under heavy throttle, neutral or slight
acceleration there is no problem.

So, how terminal and expensive is this likely to be?

--
Rob Pearson
156 1.9jtd sportwagon (now)
164 V6 Lusso (gone)