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Home >> Volkswagen >> 1976 >> Rabbit Base, 4D Hatchback, Automatic Trans >> Repair and Diagnosis >> Engine Mechanical >> Auxiliary Emission Control Systems >> Exhaust Gas RECIRCULATION >> Testing >> Dasher EGR System >> 1975-77 Models
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1975-77 Models

  1. Check vacuum hoses for damage and proper routing. Start and warm engine to normal operating temperature. Remove vacuum hose from distributor retard diaphragm and temporarily connect hose to EGR valve.
  2. Engine should run rough or stall if EGR valve is working properly. If engine does not respond as indicated, check for a faulty EGR valve or clogged EGR passage.
  3. To check vacuum booster, connect a vacuum gauge between vacuum booster and throttle valve port. With engine at idle, reading should be 0.2 - 0.3 in. Hg. If not, check throttle valve port for blockage.
  4. With specified vacuum obtained, connect vacuum gauge between vacuum booster and temperature control valve. Vacuum gauge reading should be 2-4 in. Hg. If not, replace vacuum booster.
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