Quote:
Originally Posted by aland
The solenoid was replaced recently (with a new genuine Volvo part) - no improvement  |
Boost solenoids are easy enough to test and clean without needing replacement and the problem could for example, just be a vacuum leak in the line between the solenoid and the actuator.
Regardless, you don't need to remove and open a turbo to diagnose a sticking VNT so check the MAP reading with ignition on, engine off and at idle and view the VNT mechanism.
Nothing you've said so far suggests a sticking mechanism.