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Exhaust Gas RECIRCULATION (EGR)

  1. Run engine at idle speed. Apply about 12 in. Hg to EGR valve. Engine should run rough at idle. If not, remove EGR valve and inspect for restricted port passage. If port is okay, apply about 12 in. Hg to EGR valve with vacuum pump. If valve does not function, replace EGR valve. If okay, go to step 2).
  2. Install EGR valve using new gasket. Connect vacuum gauge to EGR vacuum line using a "Y" fitting. Start engine and increase engine speed to about 3000 RPM. Vacuum gauge should indicate vacuum. If okay, test is complete. If not okay, vacuum source is plugged. Repair as necessary and repeat step 1).
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