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Home >> Chevrolet >> 1990 >> APV >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - System/Component Tests >> Exhaust Gas RECIRCULATION (EGR) >> EGR Control Solenoid
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EGR Control Solenoid

  1. Disconnect EGR solenoid electrical harness connector and vacuum hoses. Connect a hand-held vacuum pump to solenoid vacuum source port. Connect vacuum gauge to solenoid EGR port. Pump up vacuum pump. Vacuum should not be present at port to EGR valve.
  2. Activate EGR solenoid with a 12-volt power supply. Vacuum should now be present or registered at vacuum gauge. Solenoid should have at least 20 ohms of resistance.
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