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Home >> Audi >> 1978 >> 5000 Automatic Trans >> Repair and Diagnosis >> Engine Performance >> Engine Control Systems >> Exhaust Gas RECIRCULATION >> Testing >> EGR Valve >> 1978-79 Models
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1978-79 Models

  1. Check all vacuum lines for proper connections and damage. Replace if necessary. On Fox, connect distributor retard vacuum hose to EGR valve.
  2. On 5000, disconnect Yellow EGR valve vacuum hose at temperature control valve. Connect Yellow hose to "T" connector of intake manifold vacuum hose.
  3. On all models, if idle speed drops or engine stalls, EGR valve is okay. If idle speed does not change, EGR valve or line is dirty, blocked or damaged. Clean or replace as necessary.
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