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Home >> Honda >> 1986 >> Prelude Base, Automatic >> Repair and Diagnosis >> Engine Performance >> System >> Fuel Evaporation System >> Component Testing >> Vacuum Switch A >> Carbureted Engine
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Carbureted Engine

  1. Remove connector and vacuum hose No. 2 from control unit. Connect vacuum pump/gauge to hose. Using an ohmmeter, measure continuity between Black/Yellow and Brown/White wire terminals on connector. There should be continuity.
  2. Slowly apply vacuum and watch ohmmeter scale. When vacuum increases above 3.9 in. Hg, switch opens and ohmmeter should show no continuity (infinite resistance). Replace vacuum switch A if it does not operate as outlined.
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