Throttle Body (Throttle Valve Area) Cleaning - Mitsubishi 3000GT Service Manual

MULTIPORT FUEL INJECTION - On-vehicle Service
THROTTLE BODY (THROTTLE VALVE AREA)
CLEANING
(1) Start the engine, warm it up until engine coolant tempera-
(2) Disconnect the air intake hose at the throttle body side.
(3) Put a plug in the inlet of bypass passage in the throttle
(4) Spray cleaning agent from the intake port of the throttle
(5) &rt the engine and race it several times. Then, run
(6) If the deposit cannot be removed from the throttle valve,
(7) Disconnect the plug from the inlet of the bypass passage.
(8) Install the air intake hose.
(9) Use a scan tool to erase the diagnostic trouble code
CLOSED THROTTLE POSITION SWITCH AND
ADJUSTMENT
(1) Connect the MUT-II to the diagnosis tester. If the MUT-II
TSB Revision
ture rises to 80°C (176"F), and stop the engine.
b o d y .
Caution
Never allow cleaning agent to flow into the bypass
passage.
body to the valve and leave as it is for 5 minutes or
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.
repeat steps (4) and (5).
or disconnect the battery ground cable for more than
10 seconds and then connect it again.
to P. 13A-55.)
NOTE
If the engine hunts while it is idling after adjustment of
the basic idle speed, disconnect the negative cable from
the battery terminal for more than 10 seconds and then
idle the engine again.
is not used, carry out the following.
a. Disconnect the throttle position sensor connector.
b. Using jumper wires, connect an ohmmeter across
terminal (3) (closed throttle position switch) and
terminal (4) (sensor ground) of the throttle position
sensor.