Mitsubishi 1992 3000GT, Service Manual

Page: 527 / 1308

ENGINE AND EMISSION CONTROL Emission Control System
vacuum --
Vacuum
1 FU446
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
Normal state
Race the engine by rapidly The negative pressure does not
press in the accelerator pedal. vary.
(Atmospheric pressure)
Engine operation Normal state
Race the engine by rapidly The negative pressure rises to
press in the accelerator pedal.
100 (3.9 or more.
(3) Disconnect the three-way terminal, and connect the hand
vacuum pump to the EGR valve.
(4) When a negative pressure of 230 (9.1
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
Engine coolant temperature:
(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.