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Backpressure Transducer EGR System

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  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 quickly to at least 1/2 open position. If gauge reading vacuum is present, EGR vacuum port is open.
  2. If gauge reading indicates no vacuum is present, EGR vacuum port is plugged or restricted and should be cleaned. Disconnect EGR supply hose from EGR valve. Connect a hand-held vacuum pump to EGR valve. With engine at normal operating temperature, slowly apply 8 in. Hg to EGR valve. EGR valve stem should move to full extent of its travel and engine idle should roughen, RPM should drop or engine stall.
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