Is there any way of testing the small turbo elekron valve to see if its working as it should be.

I'm trying to cure the lack of boost and i've just changed standard dump valve diaphragm as it was split (thanx Stu) and car is running better but still not enough boost.

Ajusting actuator not made a lot of difference so thinking elekron valve maybe faulty.

With actuator pipe disconnected it boosts right off the gauge btw.

Any other ideas

Thanx Chris