out last nite in my 93 import wrx when it suddenly stopped boosting properly normally hits just under 1 bar and i could only reach 0.5 bar stayed like that for awhile then cruising home at 70 on the motorway put my foot down boosted back up to just under 1bar, after a little while i was on full boost and it started fluctuating and dropped back down to 0.5 bar ??????????? would i be right in suspecting the boost solenoid?????

 

Yeah would be a good place to start, give it a clean out with some brake cleaner and check all the boost/vacuum pipes for security and splits ect

 

cleaned it all out and still not boosting above 0.5 bar also been told it could be my acctuator are these prone to going weak? is it a case of a new acctuator or just tighten it up?
cheers for any help

 

Your wastegate actuator operates at 0.5 bar. If you connect the 2 green test wires under the drivers side dash and turn your ignition on (do not start engine) then the solenoid should click constantly, if it does not then its in need of relacement or another clean

 

connected them and cleaned it out and it clicks away quite happily mate ?????????????????????????????

 

Could be a blockage in the pipe work, have you tried removing the pipes and blowing them thru with brake cleaner too? Also is the brass restrictor in the bottom pipe of the solenoid is clear

 

i have a spare 3 port boost solinoid if you need it mate .rob...07790014982

 

ive blown all the pipes through with carb cleaner and cleaned the solenoid out it clicks away fine when the green connectors are togeather going to check acctuator later and replace all vacuum hoses

 

try adjusting the actuator arm

 

standard actuator, cant be adjusted. As i said before the actuator operating pressure IS 0.5 bar

 

there is plenty of posts on here saying how to adjust the std acctuator incase its gone weak????????? if the acctuator is fully open at 0.5 bar how can std boost of just under 1 bar be accheived???????????

 

Crack on and adjust it then. The BCS by its very name controls the boost not the wastegate actuator. If you put a pipe from the wastegate to the turbo nipple and bypass the BCS then it should boost to max 0.5 bar, give it a try.

https://www.scoobynet.com/search.php?searchid=2232646