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Ported EGR Valve

  1. Turn ignition off. Disconnect EGR vacuum hose at vacuum signal tube. Connect a hand-held vacuum pump to vacuum signal tube and apply 10 in. Hg. EGR diaphragm plate should move up and remain up for at least 20 seconds.
  2. If diaphragm moves up and holds for 20 seconds, diaphragm is operating properly. If diaphragm does not hold vacuum, EGR valve is defective. Place transmission in Park or Neutral and start engine.
  3. With engine running at normal operating temperature, push up on diaphragm. Engine RPM should decrease. If RPM decreases, EGR valve is functioning properly. Connect vacuum gauge to EGR valve vacuum supply hose. Raise engine speed to 2000 RPM and ensure adequate vacuum supply to EGR valve exists.
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