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Integral Backpressure Transducer Assembly

  1. Check vacuum hose routing. Disconnect EGR valve hose, and connect vacuum gauge to hose. With engine warm, vacuum to EGR valve should exist at 2000-3000 RPM. If vacuum does not exist, check vacuum lines from EGR valve to source.
  2. Clamp a plug (freeze plug may be used) into end of tailpipe; plug should be about 1/16" less than I.D. Connect vacuum pump to EGR valve. DO NOT disconnect transducer from EGR valve.
  3. Idle engine and gradually apply 6-10 in. Hg. EGR valve stem/diaphragm should move smoothly and engine speed should drop at least 100 RPM.
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