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Home >> Chevrolet >> 1990 >> Caprice Base, 5.7 7 >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - System/Component Tests >> Fuel Evaporation Control >> EVAP Purge Valve Solenoid
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EVAP Purge Valve Solenoid

  1. Disconnect purge valve solenoid harness connector and vacuum hose. Apply 10 in. Hg to ported vacuum side of solenoid valve. If vacuum holds, go to next step. If vacuum does not hold, replace canister purge solenoid.
  2. Using a 12-volt power source, energize purge valve solenoid. Vacuum should release. If not, replace purge valve solenoid. Solenoid resistance should be at least 20 ohms.
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