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Home >> Mitsubishi >> 1990 >> Montero Base, Standard >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - System/Component Tests - PFI >> Emission Systems & Sub-Systems >> Exhaust Gas RECIRCULATION (EGR) System >> System Testing (California)
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System Testing (California)

  1. Connect a vacuum tee into Green-striped hose from EGR valve and connect vacuum pump to vacuum tee. When engine is cold, 68°F (20°C) or less and at idle, snap throttle open to race engine. If no change in vacuum reading on vacuum pump gauge is detected, system is okay.
  2. When engine is hot, 158°F (70°C) and at idle, snap throttle open to race engine.
  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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