Mitsubishi 3000GT Service Manual page 527

ENGINE AND EMISSION CONTROL - Emission Control System
vacuum --
EGR SYSTEM INSPECTION <California - Non
Turbo, Turbo, Federal - Non Turbo from 1996
model>
(1) Disconnect the vacuum hose (green stripe) from the EGR
valve, and connect a hand vacuum pump through the
three-way terminal.
(2) Regarding cold condition [coolant temperature: 20°C
(68°F) or less] and warm condition [coolant temperature:
70°C (158°F) or more] of the engine, check the following
two points:
Engine operation
Race the engine by rapidly
press in the accelerator pedal.
Engine operation
Race the engine by rapidly The negative pressure rises to
press in the accelerator pedal.
(3) Disconnect the three-way terminal, and connect the hand
vacuum pump to the EGR valve.
(4) When a negative pressure of 230 mmHg (9.1 in.Hg.)
is applied during idling, check that the engine stops or
idles unstably.
EGR VALVE CONTROL VACUUM CHECK
<California - Non Turbo, Turbo, Federal - Non
Turbo from 1996 model>
Engine coolant temperature: 80-95°C (176-203°F)
(1) Disconnect the vacuum hose 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.
Vacuum raises proportionately with the rise in engine
speed.
Normal state
The negative pressure does not
vary.
(Atmospheric pressure)
Normal state
100 mmHg (3.9 in.Hg) or more.