Hopefully his lead might help its as I said 24v inactive cyl in 164 discussion/164 tech;
http://www.digest.net/alfa/FAQ/164/b...ForumID2&omm=0
Have tried all you say except swapping injectors , sorry its a mind boggling thread but most of what I have posted has been tried.
In a nutshell is difficult but I have done all continuity tests and had it confirmed by someone else , the ECU HAS BEEN CHECKED AND IS ok , PLUGS AND COILS HAVE BEEN SWAPPED AND IGN MODULE PLUGS HAVE BEEN SWAPPED, (sorry not shouting , just my typing)basically the trigger for the spark at #5 is not working and only once have I got a spark there so something is intermittent but not spark since, Crank pulley was renewed but problem was there before so can rpm sensor at crank pulley be wrong?
Is the knock sensors can I test them, I assume they are the two sensors either end of the engine that have grey wires on them , they seem to be inacessable