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Home >> Audi >> 1978 >> 5000 Automatic Trans >> Repair and Diagnosis >> Engine Performance >> Engine Control Systems >> Exhaust Gas RECIRCULATION >> Testing >> EGR Valve >> 1974-75 Models
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1974-75 Models

  1. Remove EGR valve and check for carbon deposits. Check that diaphragm plunger moves freely. Connect EGR valve to vacuum source and apply vacuum. Diaphragm plunger should lift off seat.
  2. Disconnect vacuum line. Diaphragm plunger must return to seated position. Replace copper gasket and install EGR valve. Check vacuum lines, filter, and connections for leaks, deposits, or restrictions.
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