Dave Littlewood
Just a thought...
I checked a combo quite a while ago, but cannot remember the engine type.
More vacuum to turbo actuator caused the boost to decrease instead of the usual increase.
If the vacuum pipe had no supply it would overboost.
Message Thread 
Vauxhall Combo 1.7D Y17DTL 2003 - No boost, no codes # - David Evason March 31, 2014, 12:36 pm
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on March 31, 2014, 3:16 pm, in reply to "