EGR Valve Check

Remove the EGR valve and inspect for sticking, carbon deposits, etc. If necessary, clean with a suitable solvent so that the valve seats correctly.
Connect a hand vacuum pump to the EGR valve.
Apply 67 kPa (20 in Hg) of vacuum, and check to be sure that the vacuum is maintained.
As described in the chart below, apply a vacuum and check the passage of air by blowing through one side of the EGR passage.
NOTE: Passage of air should be checked by blowing into the valve port.

Fig 1: Identifying EGR Valve Conditions
Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
Reinstall the EGR valve, using a new gasket, and tighten to the specified torque.
1. Tightening torque: 20 +/- 2 N.m (14 +/- 1.4 ft-lb)
Fig 2: Cross-Sectional View Of EGR Valve
Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.