Hello,

I have Focus ST '06 with modification and I have boost problems. I dont have problem that I have always 1/4 of boost, but I dont have proper full boost as I shound have.
Also time to time its like.. its going to boost and then pressure wave around 1/4 of boost (you feel like car is not pushing constantly) and then continue into 3/4. With my Dreamscience ECU map I always had 4/4 of boost.
Boost seems to me also very slow... Turbo lag takes longer than before.

I once had problem with oil housing so I replaced it for new with breath pipe too.
Now I hear just a very little whistle from oil housing... not like when I had problem. Is there possibility that its faulted just a very little?

Or it can be problem with Boost solenoid? Is problem with solenoid shown on diagnostic as fault?

Thanks for help