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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 (Federal)
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System Testing (Federal)

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. Disconnect Green-striped hose from throttle body and connect vacuum pump to hose end. Plug nipple where hose was connected to throttle body. When engine is cold, 122°F (50°C) or less and at idle, apply vacuum to disconnected hose. If idle does no change and vacuum bleeds down, system is okay.
  2. When engine is hot, 205°F (95°C), and at idle, apply 1.8 in. Hg vacuum. If idle does not change and vacuum holds, system is okay.
  3. Using a vacuum pump, apply 7.7 in. Hg vacuum. If idle becomes unstable or engine stalls (and vacuum holds), system is okay.
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