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Home >> Mitsubishi >> 2004 >> Lancer Evolution >> Repair and Diagnosis >> Engine Performance >> System >> Emission Control System - Evolution >> Emission Control >> Exhaust Gas RECIRCULATION (EGR) System >> EGR Port Vacuum Check
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EGR Port Vacuum Check

  1. Disconnect the vacuum hose (yellow stripe) from the throttle body EGR vacuum nipple and connect a hand vacuum pump to the nipple.
    Fig 1: Locating Throttle Body EGR Vacuum Nipple
    G00984014Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
  2. Start the engine.
  3. Measure engine vacuum at idle.
    1. Standard value: 51 kPa (15 in Hg) or more 
  4. Reset the vacuum pump to "0" (Release vacuum).
  5. Using a stop watch, measure how long it takes for the vacuum gauge to reach 51 kPa (15 in Hg).
    1. Standard value: 1.0 second or less 
  6. If it takes more than 1.0 second for the gauge to reach 51 kPa (15 in Hg), the EGR may be restricted and should be cleaned.
    Fig 2: View Of Vacuum Graph
    G00984015Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
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