Mitsubishi 3000GT 1991, Service Manual

Page: 139 / 1146

FUEL SYSTEM
Service Adjustment Procedures 13-33
THROTTLE BODY VALVE
AREA)
CLEANING
(1) Start the engine, warm it up until engine coolant tempera-
ture rises to and stop the engine.
(2) Disconnect the air intake hose at the throttle body side.
(3) Put a plug in the inlet of bypass passage in the throttle
body.
Caution
Never allow cleaning agent to flow into the bypass
passage.
(4) Spray cleaning agent from the intake port of the throttle
body to the valve and leave as it is for 5 minutes or so.
(5) Start the engine and race it several times. Then, run it idle
for approx. one minute.
NOTE
If the engine idle speed becomes unstable (and fails in the
worst case) after plugging the bypass passage, run the
engine with the throttle valve slightly opened.
(6) If the deposit cannot be removed from the throttle valve,
repeat steps (4) and (5).
(7) Disconnect the plug from the inlet of the bypass passage.
(8) Install the air ‘intake hose.
(9) Use a multi-use tester to erase the self-diagnosis code or
disconnect the battery ground cable for more than
seconds and then connect it again.
(lO)Adjust the basic idle speed (speed adjusting screw). (Refer
to
ADJUSTMENT OF IDLE POSITION SWITCH AND
THROTTLE POSITION SENSOR (TPS)
(1) Disconnect the throttle position sensor connector.
(2) Using jumper wires, connect an ohmmeter across terminal
(idle position switch) and terminal (sensor ground) of
the throttle position sensor.
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