Smoke testing an engine for boost leaks

[mrporsche]

Evening,

I have a maserati biturbo, that doesn't seem as urgent as it used to, the boost needle use to just tough the red under hard acceleration, now it just gets into the orange. (green / orange / red)

the solenoid was 20 years old so i changed that early in the year and for a while the urgency came back, but has gone again.

Starting with the cheaper easier tests first.

is it simply a case of using a smoke machine and pumping smoke into the intake and let the engine produce the pressure / vacuum or do i need to pressurise the intake system ?

Thanks