Idle Speed Check; Idle Mixture Check - Mitsubishi 4G6 Manual

11A-8
ENGINE <4G6> -
7. Check that basic ignition timing is within the standard
value.
Standard value: 5_ BTDC±2_
8. If the basic ignition timing is outside the standard value,
inspect the MPI system while referring to GROUP 13A
- Troubleshooting.
9. Press the MUT-II clear key (Select a forced driving cancel
mode) to release the Actuator test.
Caution
If the test is not cancelled, a forced driving will
continue for 27 minutes. Driving under this condition
may damage the engine.
10. Check that ignition timing is at the standard value.
Standard value: approx. 10_BTDC
NOTE
1. Ignition timing is variable within about ± 7_, even
2. And it is automatically further advanced by about

IDLE SPEED CHECK

1. Before inspection, set the vehicle to the pre-inspection
condition.
2. Turn the ignition switch to OFF and connect the MUT-II
to the diagnosis connector.
3. Check the basic ignition timing.
Standard value: 5_ BTDC±2_
4. Run the engine at idle for 2 minutes.
5. Check the idle speed. Select item No. 22 and take a
reading of the idle speed.
Standard value: 750 ± 100 r/min
NOTE
The idle speed is controlled automatically by the idle speed
control (ISC) system.
6. If the idle speed is outside the standard value, inspect
the MPI components by referring to GROUP 13A -
Troubleshooting.

IDLE MIXTURE CHECK

1. Before inspection, set the vehicle to the pre-inspection
condition.
2. Turn the ignition switch to OFF and connect the MUT-II
to the diagnosis connector.
3. Check that the basic ignition timing is within the standard
value.
Standard value: 5_ BTDC±2_
4. Run the engine at 2,500 r/min for 2 minutes.
On-vehicle Service
under normal operating.
5_ from standard value at higher altitudes.
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