Exaust Gas Recirculation (Egr) Control System Check; Egr Valve Check - Mitsubishi MOTORS Space Runner 1999 Workshop Manual Supplement

17-10
ENGINE AND EMISSION CONTROL -
<4G63-MPI>
Green stripe
Three-way terminal
EGR valve
<4G63-MPI>
Plug
Green stripe
EGR valve
Emission Control System <MPI>
EXHAUST GAS RECIRCULATION (EGR)
CONTROL SYSTEM CHECK
1. Disconnect the vacuum hose (green stripe) from the EGR
valve, and then connect a hand vacuum pump via the
three-way terminal.
2. When the engine is hot or cold, check the condition of
vacuum by racing the engine.
When engine is cold
(Engine coolant temperature: 20_C or less)
Throttle valve
Open quickly
When engine is hot
(Engine coolant temperature: 80_C or higher)
Throttle valve
Open quickly
3. Disconnect the three-way terminal.
4. Connect the hand vacuum pump to the EGR valve.
5. Check whether the engine stalls or the idling is unstable
when a vacuum of 30 kPa or higher is applied during
idling.

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
3.3 kPa or less
28 kPa or more
5. Replace the gasket, and tighten to the specified torque.
Tightening torque: 22 Nm
Normal vacuum condition
No vacuum will generate
(the same as barometric pressure.)
Normal vacuum condition
It will momentarily rise over 13 kPa
Passage of air
Air is not blown out
Air is blown out