Mitsubishi 3000GT Service Manual page 76

speed
detection #
tor (blue) 7
ENGINE
correct timing.
Actual ignition timing: Approx. 15" BTDC
NOTE
(1) Ignition timing is variable within about +7", even-under
normal operation.
(2) And it is automatically further advanced by about
5 from 15" BTDC at higher altitudes.
IGNITION TIMING CHECK
(1) The vehicle should be prepared as follows before the
inspection and adjustment.
l Engine coolant temperature: 80-95°C (176-203°F)
Lights, electric cooling fan and accessories: OFF
l
Transaxle: neutral (P for A/T)
l
Insert a paper clip to the engine speed detection connector
(blue), and connect a tachometer to the paper clip.
NOTE
Do not use the scan tool. If tested with the scan tool
connected to the data link connector, the ignition timing
will not be the basic timing but be ordinary timing.
(3) Set the timing light.
(4) Start the engine and run at idle.
(5) Check curb idle speed.
Curb idle speed: 700 + 100 rpm
NOTE
The engine speed indicated is a third of actual speed.
In other words, the reading of the tachometer times 3
is actual speed.
(6) Turn OFF the ignition switch.
(7) Disconnect the waterproof female connector from the igni-
tion timing adjusting connector (brown).
(8) Using a jumper wire, ground the ignition timing adjusting
terminal.
NOTE
Grounding this terminal sets the engine to the basic ignition
timing.
(9) Start the engine and run at idle.
(10)Check basic ignition timing.
Basic ignition timing: PBTDC rt 3"
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