chittychittybangbang· Premium Member
The n75 boost solenoid is on the firewall above the brake booster. It controls the boost that the turbo puts out. Most of the time, it's not broken, it just needs cleaning with carb cleaner. The vacuum lines going to and from the solenoid can also crack and leak air. This would be a good time to clean the solenoid out and replace all of the vacuum lines as well.