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Home >> Mercury >> 1977 >> Capri II Ghia, Automatic Trans >> Repair and Diagnosis >> Engine Performance >> Engine Control Systems >> Dual Diaphragm Distributor >> Testing >> Vacuum Advance
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Vacuum Advance

Disconnect vacuum lines from both outer and inner diaphragms. Plug line removed from inner diaphragm. Using a tachometer, increase idle speed by using first step of fast idle cam. Using a timing light, observe ignition timing setting. Connect carburetor vacuum line to outer diaphragm. Timing should advance immediately.