900 L4-1985cc 2.0L DOHC Turbo EFI (1985)
Boost Pressure Solenoid Valve: Testing and Inspection
Solenoid Valve Restrictor
Checking the solenoid valve restrictor
The solenoid connection (marked C) leading to the hose from the turbocharger outlet incorporates a restriction.
Check that the restriction is free from dirt, etc.
If the restriction is blocked and the dirt cannot be removed, replace the solenoid valve.