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Home >> Toyota >> 1991 >> Pickup Base, G57 >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - System/Component Tests >> Emission Systems & Sub-Systems >> Pulse Air System >> System Test (3.0L)
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System Test (3.0L)

  1. Check hoses and tubes for cracks, kinks, damage, or loose connections. Check Pulse Air (PAS) system cold operation. See Figure.
  2. Ensure coolant temperature is less than 77°F (25°C). Start engine and allow to idle. Disconnect pulse air hose from air pipe. See Figure. Check for air bubbling noise from air pipe.
  3. Check hot system operation. When engine temperature is at normal operating temperature, bubbling noise should not be heard from air pipe. Race engine to 2000 RPM. Ensure bubbling noise stops momentarily.