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1986 944 Turbo Boost Principles

Engine

Vehicle Information: Model(924/944): 944 turbo; Year: 1986; Engine (type, size, modifications): As issued by Porsche; Total Mileage: 158,00 km;

Does anyone know where I can find a principles of operation type description of the turbo and boost control system for the 944 turbo. Components, connections, pressure and electrical control signals etc. I have the factory shop manuals and turbo supplement but it's not real helpful in this area. I have an intermittent problem with boost and knowing how it is supposed to work will be most useful in diagnosis.

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