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1975-79 Dasher

  1. Warm engine to normal operating temperature. Disconnect vacuum hose from distributor retard diaphragm and temporarily connect this hose to EGR valve.
  2. Engine should run rough or stall if EGR valve is working properly. If engine does not run rough or stall, check for clogged EGR ports or for faulty EGR valve.
  3. To check vacuum booster, connect vacuum gauge between vacuum booster and throttle valve port. With engine at idle, vacuum reading should be 2-4 in. Hg. If vacuum reading is not specified, 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 vacuum reading is not as specified, replace vacuum booster.
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