Last sat I had all of a sudden had a big boost drop from 0.9 bar to 0.4 bar! Ma dump valve an wastegates stopped working but after checking all hoses an pipes found nothing wrong! After 10 min of further driving the wastegates started chattering an started boosting at 0.7bar! Dump valve still not working an I dont unferstand how an why i've lost boost! Anyone able to shine any light on this?

Cheers

Jason

 

ttt

 

Boost control solenoid perhaps? If you have a look at my query on cleaning a 3 port solenoid that Bob Rawle answered it might be worth following the same procedure as it would at least allow you to rule something out and only takes ten minutes. Good luck.