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Home >> Mitsubishi >> 1990 >> Precis Base, Standard >> Repair and Diagnosis >> External Pages >> Different car >> Section 1 (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)

WARNING: This page does not describe the selected car, but rather 8 other vehicles, including the 1990 Mitsubishi Van, 1990 Mitsubishi Sigma, 1990 Mitsubishi Pickup, 1990 Mitsubishi Montero, and 1990 Mitsubishi Mirage. However, it is still accessible from the selected car via links, so may be relevant.
  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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