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System Testing (California)

  1. Connect vacuum "T" fitting into Green-striped hose from EGR valve, and connect vacuum gauge to vacuum tee. When engine coolant temperature is 68°F (20°C) or less and engine is idling, snap throttle open to race engine. If no change in vacuum reading is detected on gauge, system is okay.
  2. When engine coolant temperature is 158°F (70°C) or more and engine is idling, snap throttle open to race engine. If vacuum increases to 3.9 in. Hg or higher, system is okay.
  3. Using vacuum pump, apply specified vacuum to open EGR valve. See EGR VALVE SPECIFICATIONS  table. If idle becomes unstable or engine stalls, system is okay.
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