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Home >> Volvo >> 1977 >> 242 Standard Trans >> Repair and Diagnosis (Single Page) >> Engine Mechanical >> Exhaust >> Exhaust Gas RECIRCULATION >> Testing >> Solenoid Vacuum Valve >> 1976-78 Models (With Vacuum Amplifier)

1976-78 Models (With Vacuum Amplifier)

  1. Allow engine to idle and disconnect vacuum hose at connection No. 1 of vacuum amplifier. Connect a vacuum pump to vacuum amplifier. See Fig 1. The EGR valve should remain closed.
  2. Increase engine speed and check that EGR valve opens. Quickly release throttle and check that EGR valve quickly closes. If not, and micro switch is operating correctly, the EGR valve or solenoid vacuum valve are defective.
    Fig 1: 1976-78 Solenoid Vacuum Valve Test
    G09350920Courtesy of VOLVO CARS CORPORATION
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