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EGR Valve Test

  1. Disconnect EGR valve solenoid electrical connector. EGR valve is located on side of intake manifold. See Figure . By-pass EGR vacuum transducer by connecting EGR valve solenoid output directly to EGR valve. If EGR valve is good, engine should idle roughly or stall. Proceed to EGR VACUUM TRANSDUCER  testing. If idle does not change, go to next step.
  2. Disconnect vacuum hose from EGR valve and connect hand operated vacuum pump to EGR valve. Apply at least 12 in. Hg of vacuum to valve. If engine now idles roughly or dies, check vacuum lines between EGR valve and intake manifold. Also, check vacuum line between transducer and EGR base. If no leaks are found, proceed to EGR VACUUM TRANSDUCER  test.
  3. If engine RPM did not change in step 2), remove EGR valve. Inspect EGR valve and exhaust passage in manifold for blockage, repair as necessary. If no blockage is found, replace EGR valve.
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