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Home >> Mitsubishi >> 1991 >> Precis Base, Automatic >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - System/Component Tests >> Emission Systems & Sub-Systems >> Exhaust Gas RECIRCULATION (EGR) System >> Notes
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Exhaust Gas RECIRCULATION (EGR) System: Notes

  1. Disconnect Green-striped hose from throttle body and connect hand-held vacuum pump to hose end. Plug nipple where hose was connected to throttle body. When engine is 122°F (50°C) or less and at idle, apply vacuum to disconnected hose. If idle does not change and vacuum bleeds down, system is okay.
  2. When engine is 176-205°F (80-95°C) or more and at idle, apply 2 in. Hg. If idle does not change and vacuum holds, system is okay.
  3. Using a vacuum pump, apply 6.8 in. Hg. If idle becomes unstable or engine stalls (and vacuum holds), system is okay.
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