Quote:
Originally Posted by R.Diesel
The mechanism that meters boost is the wastegate actuator. A vacuum line is feeding pressure from a switchover valve and vacuum transducer to the actuator. At idle you should have Vacuum pressure equal or near system values ~25MMhg I believe.
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1986/87 cars are a PRESSURE operated waste gate, the hose to the waste gate actuator should connect to the manifold side of the turbo. The vacuum operated one didn't come along until later. If there is a vacuum anything on the turbo it is the ARV and can be safely disconnected (federal W126 cars with the same engine didn't have it).