Re: Alfa 159 strange noise when hot
I had some strange sounds coming from the engine of my 159 and took it in to the dealer, first thing that the mechanic suspected was two black tubes that come out of a big cylindrical thing (sorry, don't know what it is!) he thought it was these knocking on the bulkhead due to high pressure fuel being pumped through. He then remembered that this was a problem on the GT and the cure was to fit stiffer rubber tubes as the original ones were too soft but didn't think it would apply to the 159. Anyway turns out that my noise was the tappets (I have a post on this at the moment). Not sure if this will help or even if they're the same tubes.
Hope you get it sorted.