I have problems with my fantastic Alfa 159
It 2005, 1,9JTDM, 110kw. Its having quite rough idle - revs go up and down 750 - 900 rmp at idle. Some times more, some times less. Once it stalled and after 15 min. of trying, it started and its running again since then.
Anyway, I checked with MultiEcuScan. No fault codes stored or present. But I noticed that fuel preasure is fluctuating a lot at idle. Check the attached picture.
What could be the problem cause here? I was first suspecting injectors but after seeing this picture, I seems like something else..
If any of you have some ideas, please let me know. Thanks!
Blue is actual fuel preasure, red is desired. low level is on idle. then I reved twice when graph goes higher.