Mitsubishi 3000GT 1991, Service Manual

Page: 138 / 1146

13-32
FUEL SYSTEM
S
Adjustment Procedures
Using a jumper wire, ground the self-diagnosis/data
transmission selector terminal (terminal of the
diagnosis connector (white).
Self-diagnosis/
data
(4) Remove the waterproof female connector from the ignition
timing adjusting connector (brawn).
(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.
When using the multi-use tester, select item No. 38 and
read the idle speed.
Basic idle 700 50 rpm
NOTE
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 necessary.
(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
(8) If the basic idle speed is out of specification, adjust by
turning the speed adjusting screw (SAS).
NOTE
If the idle speed is higher than the standard value even with
SAS fully tightened, check to see if there is evidence of the
idle switch (fixed SAS) being moved. If the idle 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 In such a case, replace
the throttle body.
(9) Turn the ignition switch OFF.
(lO)When the multi-use tester has not been used, remove the
jumper wire from the self-diagnosis/data transmission
s e l e c t o r t e r m i n a l .
the jumper wire from. the ignition timing adjusting
terminal and replace the connector back again.
(12)Start the engine again and run at idle for minutes to
make sure that the engine runs at proper idle speed.
TSB Revision