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1979 Rabbit & Scirocco

  1. Start and warm engine to normal operating temperature. Remove vacuum hose from distributor retard diaphragm and connect to EGR valve. Engine should run rough or stall. If not, check for clogged EGR passage or faulty EGR valve.
  2. Install vacuum gauge between EGR temperature control valve and EGR valve. With engine idling and at normal operating temperature, vacuum gauge should read 2-4 in. Hg. If vacuum reading is not 2-4 in. Hg, replace EGR temperature control valve.
  3. Install vacuum gauge between vacuum amplifier and temperature control valve. Vacuum gauge should read 2-4 in. Hg. If vacuum reading is not 2-4 in. Hg, replace vacuum amplifier.
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