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Home >> Honda >> 1983 >> Prelude Automatic >> Repair and Diagnosis >> Engine Performance >> System >> Fuel Evaporation System >> Component Testing >> Power Valve Control Solenoid & Check Valves
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Power Valve Control Solenoid & Check Valves

  1. Remove hose from power valve (on carburetor). Connect vacuum pump to hose and draw vacuum with ignition key "OFF". Vacuum should remain steady. If not, replace check valve.
  2. Turn ignition to "ON". Vacuum should drop. If vacuum remains steady, remove check valve and connect vacuum pump to hose and draw vacuum. Vacuum should remain steady, If not, replace power valve solenoid.
  3. Connect vacuum gauge to hose from power valve. Start engine and run at idle. Vacuum should be present. When engine is warm, vacuum will drop.
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