Egr Valve Check; Egr Port Vacuum Check - Mitsubishi Electric Lancer Evolution-VII Workshop Manual

ENGINE AND EMISSION CONTROL -
Throttle body
White stripe
Vacu-
um
Engine speed (r/min)
Emission Control System

EGR VALVE CHECK

1. Remove the EGR valve and inspect for sticking, carbon
deposits, etc. If found, clean with a suitable solvent so
that the valve seats correctly.
2. Connect a hand vacuum pump to the EGR valve.
3. Apply 67 kPa of vacuum, and check that the vacuum
is maintained.
4. Apply a vacuum and check the passage of air by blowing
through one side of the EGR passage.
Vacuum
5.3 kPa or less
27 kPa or more
5. Replace the gasket, and tighten to the specified torque.
Tightening torque: 20 ± 2 N·m

EGR PORT VACUUM CHECK

1. Disconnect the vacuum hose (White stripe) from the
throttle body EGR vacuum nipple and connect a hand
vacuum pump to the nipple.
2. Start the engine and check vacuum remains fairly constant
after racing the engine.
NOTE
If the vacuum fluctuates, the throttle body EGR port may
be clogged and need cleaning.
17-15
Passage of air
Air is not blown out
Air is blown out