Exhaust Gas Recirculation (Egr) Control System Check <Mpi; Egr Port Vacuum Check <Mpi - Mitsubishi MOTORS Space Runner 1999 Workshop Manual Supplement

17-20
ENGINE AND EMISSION CONTROL –
Green stripe
EGR port
vacuum nipple
Vacuum
Engine speed (r/min)
EXHAUST GAS RECIRCULATION (EGR)
CONTROL SYSTEM CHECK <MPI>
1. Disconnect the vacuum hose (green stripe) from the throttle
body, and connect a hand vacuum pump to the vacuum
hose.
2. Plug the nipple from which the vacuum hose was removed.
3. When the engine is cold and hot, apply a vacuum while
Plug
the engine is idling, and check the condition of the engine
and the vacuum.
When engine is cold (Engine coolant temperature:
40 C or less)
When engine is hot (Engine coolant temperature: 80 C
or higher)
EGR PORT VACUUM CHECK <MPI>
1. Disconnect the vacuum hose (green stripe) from the throttle
body EGR vacuum nipple and connect a hand vacuum
pump to the nipple.
2. Start the engine and check to see that, after raising the
engine speed by racing the engine, EGR vacuum raises
proportionately with the rise in engine speed.
NOTE
If there is a problem with the change in vacuum, it is
possible that the throttle body EGR port may be clogged
and require cleaning.
Emission Control System
Hand vacuum Normal engine
pump condition
Vacuum is No change
applied
Hand vacuum Normal engine
pump condition
5.3 kPa No change
27 kPa Idling becomes
slightly unstable
or engine stalls.
17300260152
Normal vacuum
condition
Vacuum leaks
Normal vacuum
condition
Vacuum is
maintained
Vacuum is
maintained
17300290106