Mitsubishi 3000GT Service Manual page 160

MULTIPORT FUEL IbiJECTlON - On-vehicle Service
WFU1466
Ignition timing
adjusting connect01
From 1994 models:
3) Use the special tool (Diagnostic Trouble Code Check
Harness) to ground the diagnostic test mode control
terminal (terminal (1)) of the data link connector
(4) Remove the waterproof female connector from the ignition
timing adjusting connector (brown).
(5) Using a jumper wire, ground the ignition timing adjusting
terminal.
(6) Start the engine and run at idle.
(7) Check the basic idle speed.
Basic idle speed: 700 + 50 rpm
NOTE
1. The engine speed may be low by 20 to 100 rpm
while the vehicle is new [distance driven approx. 500
km (300 miles) or less], but no adjustment is neces-
sary.
2. If the engine stalls or speed is low despite a sufficient
distance driven [approx. 500 km (300 miles) or more],
it is probably due to deposits on the throttle valve.
In this case, clean the throttle valve. (Refer to
P. 13A-57.)
3. The tachometer should read l/3 of the actual engine
speed. This means that the actual engine speed is
the tachometer reading multiplied by 3.
(8) If the basic idle speed is out of specification, adjust by
turning the engine speed adjusting screw.
NOTE
If the idle speed is higher than the standard value even
with engine speed adjusting screw fully tightened, check
to see if there is evidence of the closed throttle position
switch being moved. If the closed throttle position switch
seems to have been moved, adjust it. If it does not seem
to have been moved, there may be a leak caused by
deteriorated fast idle air valve (FIAV). In such a case,
replace the ,throttle body.
(9) Turn the ignition switch OFF.
wire from the diagnostic test mode control terminal.
(ll)Remove the jumper wire from the ignition timing adjusting
terminal and replace the connector back again.
to make sure that the engine runs at proper idle speed.
I