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From The Saab Tech Wiki
===Diagnosis===
To isolate BPC failures from other sources of boost problems, unplug the electrical connector temporarily, or bypass the valve with a single hose from the compressor to the waste gate. (C to W on the turbo. To make the job easier, the C and W hoses can simply be disconnected from the valve, and connected to each other with a two way hose connector. With the BPC valve out of the picture, acceleration should be smooth and normal up to 6 psi (mid-yellow on the stock boost gauge). If not, the problem is somewhere else.
===Electrical Test===
The resistance of the two solenoid coils can be measured to see if a coil has burned out or shorted. To test, unplug the electrical connector and measure across pins 1 and 2, and also across 2 and 3. In both cases, the resistance of a good coil is about 3 ohms. If not, the valve should be replaced.
==Removal and Cleaning==
===Cleaning===
The picture below shows one screw which could not be separated from the bushing insert. If the valve is clogged by oil or dust and causing overboost and fuel cut, it can usually be cleaned by blowing compressed air into the ports, using a can of compressed "dry" air from an office supply store. If the valve is clogged by oil residue, using solvent (isopropyl alcohol, electrical contact cleaner, carb cleaner) may be necessary as a last resort.
