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Home >> Buick >> 1994 >> Roadmaster Base >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - System/Component Tests - 5.7L >> Emission Systems & Sub-Systems >> Exhaust Gas RECIRCULATION (C-7) >> EGR Control Solenoid (Normally Open)
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EGR Control Solenoid (Normally Open)

  1. Disconnect solenoid harness connector. Install vacuum pump to vacuum source side of solenoid. Apply vacuum to solenoid. Vacuum should pass through when solenoid connector is disconnected.
  2. Apply battery voltage and ground to solenoid terminals. With solenoid energized, apply vacuum to solenoid. Vacuum should not pass through solenoid. If results are not as specified, check EGR solenoid resistance. Solenoid should have at least 20 ohms of resistance.
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