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Backpressure Transducer EGR System

  1. Check vacuum hoses for correct routing. Connect a vacuum gauge directly to EGR vacuum source on carburetor. With engine running, open and close throttle. If vacuum is present, EGR vacuum port is open.
  2. If no vacuum is present, EGR vacuum port is plugged. Disconnect EGR supply hose from EGR valve. Connect a vacuum pump to EGR valve. With engine at normal operating temperature and at 2000-2500 RPM, slowly apply 8 in. Hg to EGR valve. EGR valve stem should move up, oscillate and move down with throttle movement. Release vacuum and engine speed should increase.
  3. If operation is not as specified, check for plugged EGR passages or faulty EGR valve.
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