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Test 3

  1. Warm engine to normal operating temperature. Operate engine at idle. Attach a vacuum gauge to EGR vacuum hose. Locate EGR vacuum solenoid.
  2. Using a jumper wire, ground signal wire from ECM to EGR vacuum solenoid. Vacuum should be present at EGR vacuum hose. On some models, engine speed may have to be increased 3000-4000 RPM.
  3. Connect a hand-held vacuum pump to EGR valve. Start engine. Apply vacuum to EGR valve. If engine runs rough or stalls, and gauge holds vacuum, EGR valve is functioning properly.
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