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EGR System

  1. Check vacuum hoses for correct routing. Warm engine to normal operating temperature. Engine coolant temperature must be greater than 150°F (65°C).
  2. Apply parking brake. Place transmission in Neutral with throttle in idle position. Suddenly increase engine RPM to 2000-3000 RPM, while noting movement of EGR valve stem. DO NOT exceed 3000 RPM.
  3. Valve stem in EGR valve should move when engine RPM is increased. Repeat test procedure several times to ensure correct operation. If valve stem does not move, check EGR system and vacuum supply.
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