Mitsubishi Pick-ups and Montero 1983-1995 Repair Guide

Intake Air Temperature Control System

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This system is only found on the 2.0L and 2.6L gasoline engines.

INSPECTION



See Figure 1

System Inspection
  1. Remove the air filter cover and air duct.
  2.  
  3. Run the engine at idle and check the air control valve condition. At 86°F (30°C) or less, the cold air side inlet should close. At 113°F (45°C) or more, the cold air side inlet should open.
  4.  

If necessary, apply compressed air to cool or apply hot air using a hair dryer, etc. to heat.



Click image to see an enlarged view

Fig. Fig. 1: A diagram of a common intake air temperature control system-2.0L and 2.6L engines

Air Control Valve

See Figure 2

A vacuum pump capable of producing more than 10 in. Hg (33.8 kPa) of vacuum will be needed to perform this test.

  1. Remove the air filter.
  2.  
  3. Disconnect the vacuum hose from the air control valve and connect a hand vacuum pump to the valve nipple.
  4.  
  5. Apply a vacuum of 19.75 in. Hg (67 kPa) and check to make sure the vacuum holds steady and does not leak down.
  6.  
  7. Check the air control valve operation. With a vacuum of 2.85 in. Hg (9 kPa) or less the cold air side inlet opens. With a vacuum of 7.53 in. Hg (25 kPa) or more the cold air side inlet closes.
  8.  
  9. Connect the vacuum hose back to their original position.
  10.  



Click image to see an enlarged view

Fig. Fig. 2: Use a hand vacuum pump to check the air control valve

Thermo Sensor

See Figure 3

A vacuum pump capable of producing more than 10 in. Hg (33.8 kPa) of vacuum will be needed to perform this test.

  1. Connect a hand vacuum pump to the thermo sensor nipple and check air tightness. With the thermo sensor temperature at 86°F (30°C) or less the vacuum should not leak. With the thermo sensor temperature at 113°F (45°C) or more the vacuum should leak.
  2.  
  3. If any fault is found in the above checks, replace the air filter body.
  4.  



Click image to see an enlarged view

Fig. Fig. 3: Using a vacuum pump, check to make sure the thermo sensor holds vacuum at 86°F (30°C) or less.

 
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