Egr Valve Inspection; Thermal Vacuum Valve Inspection - Mitsubishi 1989-1993 GALANT Service Manual

EMISSION CONTROL SYSTEMS -
Engine speed (rpm)
Exhaust Gas Recirculation (EGR)
(2) Start the engine and check to see that, after raising the
engine speed by racing the engine, vacuum raises prop-
ortionately with the rise in engine speed.
NOTE
if there is a problem with the change in vacuum, it is
possible that the throttle body port may be clogged and
require cleaning.
EGR VALVE
INSPECTION
(1) Remove the EGR valve and check it for sticking, deposit of
carbon, etc.
If such condition exists, clean with adequate solvent to en-
sure tight valve seat contact.
(2) Connect a hand vacuum pump to the EGR valve.
(3) Apply a vacuum of 500 mmHg (19.6 in.Hg.) and check air
tightness.
(4) Blow in air from one passage of the EGR to check condition
as follows.
INSTALLATION
Install a new gasket and EGR valve, tighten bolts to
(1)
specified torque.
Specified tightening torque: 17-26 Nm (12-19 ft.lbs.1
THERMAL VACUUM VALVE <Federal>
INSPECTION
(1) Disconnect the vacuum hoses from the thermal vacuum
valve, and connect a hand vacuum pump to nipple of the
thermal vacuum valve.
(2) Apply a vacuum and check the air passage through the
thermal vacuum valve.
System