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Except 2.6L

  1. Place transmission in Neutral (man. trans.) or "P" (auto. trans.). Start engine and warm to normal operating temperature by idling engine.
  2. Abruptly open throttle to approximately 2000-3000 RPM. Visible movement of the EGR valve stem should be noted. Repeat several times if necessary.
  3. Attach a hand vacuum pump to EGR valve with engine at idle. Apply at least 5 in. Hg of vacuum and engine should run rough or stall.
  4. Attach vacuum gauge to EGR hose and open throttle quickly several times. A fluctuation of several in. Hg should be noted.
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