LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> Mitsubishi >> 1991 >> Precis Base, Automatic >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - System/Component Tests >> Emission Systems & Sub-Systems >> Fuel Evaporation >> System Test
April 5, 2026: LEMON Manuals is launched! Read the announcement.

System Test

  1. Disconnect Red-striped vacuum hose between throttle body and purge control solenoid valve at throttle body. Connect a hand-held vacuum pump to disconnected vacuum hose. Plug nipple on throttle body where vacuum hose was removed.
  2. On 3.0L engines, with engine temperature at 104°F or 40°C (140°F or 60°C on 1.5L and 2.4L engines) or less and engine idling, apply 7.3 in. Hg vacuum should hold. Raise engine speed to 3000 RPM and again apply 7.3 in. Hg vacuum should hold.
  3. On 3.0L engines, with engine coolant temperature at 176°F or 80°C (158°F or 70°C on 1.5L and 2.4L engines) or more and engine idling, apply 7.3 in. Hg vacuum should hold. Turn engine off. Start engine and within 3 minutes of starting engine, apply vacuum. Vacuum should bleed down.
  4. With engine running for more than 3 minutes after starting, raise engine speed to 3000 RPM and apply 7.3 in. Hg. Vacuum should hold momentarily and then bleed down.
scientia non olet · About LEMON Manuals