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Home >> Pontiac >> 1979 >> Phoenix Base, 2D Hatchback, 3.8L Eng VIN A, Automatic Trans >> Repair and Diagnosis >> Engine Performance >> Engine Control Systems >> Computer Controlled Catalytic Converter >> Testing & Diagnosis >> Distributor Advance/Retard System Tests (1979 3.8L Engine) >> Distributor Dual Diaphragm Vacuum Advance Unit

Distributor Dual Diaphragm Vacuum Advance Unit

Using a hand-held vacuum pump, attach pump to either side of unit. Create at least 12 in. Hg vacuum with pump. Vacuum unit linkage should move. Vacuum reading on pump should remain constant. If linkage does not move or if vacuum drops, unit is defective. Repeat test procedure on other side of unit.

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