Originally Posted by
Bidja
Just to add here, do a quick check of VNT actuator function (vacuum):
at idle, is the actuator rod in the raised position, ensure that the lever is resting against vane limit stop screw? yes/no (should be yes), and
then still at idle, pull the vacuum hose off the actuator rod should drop to bottom of stroke promptly? yes/no (should be yes)
As mentioned _ Check that all boost hoses are fitting securely, check for splits/damage, loose clamps. Check your boost reference take off point, hose and connection for leaks.