does the boost control valve click all the time? from engine being cold on a wrx turbo 97classic please? or only when norm temp driving it hard etc???

or does it just click on/off rapidly when you have been driving the car harder than norm?
trying to work out if this unit is on its way out or going faulty in some way!

thanks.

any wrx classic woners out there to advise me on this one asap?
thanks.:cu ckoo:

 

it will only constsntly click when its in test mode,.,,.