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Home >> Lexus >> 1996 >> LX 450 >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - System/Component Tests >> Emission Systems & Sub-Systems >> Fuel Evaporation System >> EVAP Thermal Vacuum Valve

EVAP Thermal Vacuum Valve

  1. Drain cooling system. Remove EVAP TVV located in coolant passage on cylinder head. See Figure.
  2. Use cool water to cool threaded end of EVAP TVV to less than 113°F (45°C). Apply air pressure to lower vacuum hose port on EVAP TVV. Ensure EVAP TVV is closed and air flows from the air filter, located on top of EVAP TVV.
  3. Heat water to greater than 147°F (64°C). Apply air pressure to lower vacuum hose port on EVAP TVV. Ensure EVAP TVV is open and air flows through upper vacuum hose port and not through air filter. Replace EVAP TVV if defective. Apply thread sealant to threads of EVAP TVV and reinstall. Tighten EVAP TVV to 21 ft. lbs. (29 N.m). Fill cooling system.
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