Mitsubishi Lancer Evolution 7. Manual — part 146
ENGINE -
On-vehicle Service
ENGINE -
On-vehicle Service
11A-9
IGNITION TIMING CHECK
1. Before inspection, set the vehicle to the pre-inspection
condition.
2. Turn the ignition switch to “LOCK” (OFF) position and
then connect the MUT-II to the diagnosis connector.
3. Set up a timing light.
4. Start the engine and run at idle.
5. Check that engine idle speed is within the standard value.
Standard value: 850 ± 100 r/min
6. Select No.17 of the MUT-II Actuator test.
7. Check that basic ignition timing is within the standard
value.
Standard value: 5_ BTDC ± 3_
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: approximately 5_BTDC
NOTE
(1) Ignition timing is variable within about ± 7, even under
normal operating.
(2) And it is automatically further advanced by
approximately 5_ from standard value at higher
altitudes.
11. Remove the timing light.
12. Turn the ignition switch to “LOCK” (OFF) position and
then remove the MUT-II.
IDLE SPEED CHECK
1. Before inspection, set the vehicle to the pre-inspection
condition.
2. Turn the ignition switch to “LOCK” (OFF) position, and
then connect the MUT-II to the diagnosis connector.
3. Set the timing light.
4. Check that the basic ignition timing is within the standard
value.
MUT-II
MUT-II
ENGINE -
On-vehicle Service
ENGINE -
On-vehicle Service
11A-10
Standard value: 5_ BTDC ± 3_
5. Run the engine at idle for 2 minutes.
6. Check the idle speed. Select item No. 22 and take a
reading of the idle speed.
Curb idle speed: 850 ± 100 r/min
NOTE
The idle speed is controlled automatically by the idle speed
control (ISC) system.
7. If the idle speed is outside the standard value, check
the MPI components by referring to GROUP 13A -
Troubleshooting.
8. Remove the timing light.
9. Turn the ignition switch to the “LOCK” (OFF) position
and then remove the MUT-II.
IDLE MIXTURE CHECK
1. Before inspection, set the vehicle to the pre-inspection
condition.
2. Turn the ignition switch to the “LOCK” (OFF) position,
and then connect the MUT-II to the diagnosis connector.
3. Set the timing light.
4. Check that the basic ignition timing is within the standard
value.
Standard value: 5_ BTDC ± 3_
5. Run the engine at 2,500 r/min for 2 minutes.
6. Set the CO, HC tester.
7. Check the CO contents and the HC contents at idle.
Standard value
CO contents: 0.1% or less
HC contents: 100 ppm or less
8. If there is a deviation from the standard value, check the
following items:
D
Diagnosis output
D
Closed-loop control (When the closed-loop control
is normal, the output signal of the oxygen sensor
changes between 0 - 400 mV and 600 - 1,000 mV
at idle.)
D
Fuel pressure
D
Injector
D
Ignition coil, spark plug cable, spark plug
D
Evaporative emission control system
D
Compression pressure
NOTE
Replace the three way catalyst when the CO and HC
contents are not within the standard value, even though
the result of the inspection is normal on all items.
9. Remove the timing light.
MUT-II
ENGINE -
On-vehicle Service
ENGINE -
On-vehicle Service
ENGINE -
On-vehicle Service
11A-11
10. Turn the ignition switch to the “LOCK” (OFF) position
and then remove the MUT-II.
COMPRESSION PRESSURE CHECK
1. Before inspection, check that the engine oil, starter and
battery are normal. In addition, set the vehicle to the
pre-inspection condition.
2. Remove the ignition coils and spark plug cables.
3. Remove all of the spark plugs.
4. Disconnect the crank angle sensor connector.
NOTE
Doing this will prevent the engine-ECU from carrying out
ignition and fuel injection.
5. Cover the spark plug hole with a shop towel etc., and
after the engine has been cranked, check that no foreign
material is adhering to the shop towel.
Caution
(1) Keep away from the spark plug hole when
cranking.
(2) If compression is measured with water, oil, fuel,
etc., that has come from cracks inside the cylinder,
these materials will become heated and will gush
out from the spark plug hole, which is dangerous.
6. Set compression gauge to one of the spark plug holes.
7. Crank the engine with the throttle valve fully open and
measure the compression pressure.
Standard value (at engine speed of 250 r/min):
1,128 kPa
Limit (at engine speed of 250 r/min):
Min. 951 kPa
8. Measure the compression pressure for all the cylinders,
and check that the pressure differences of the cylinders are
below the limit.
Limit: Max. 98 kPa
9. If there is a cylinder with compression or a compression
difference that is outside the limit, pour a small amount
of engine oil through the spark plug hole, and repeat
the operations in steps 7 and 8.
(1) If the compression increases after oil is added, the
cause of the malfunction is a worn or damaged piston
ring and/or cylinder inner surface.
(2) If the compression does not rise after oil is added,
the cause is a burnt or defective valve seat, or pressure
is leaking from the gasket.
10. Connect the crank angle sensor connector.
11. Install the spark plugs.
Crank angle sensor
connector
ENGINE -
On-vehicle Service
11A-12
12. Install the ignition coils and spark plugs.
13. Use the MUT-II to erase the self-diagnosis codes or
disconnect the battery cable from the battery (-) terminal
for 10 seconds or more and then reconnect the cable.
NOTE
This will erase the diagnosis code resulting from the crank
angle sensor connector being disconnected.
MANIFOLD VACUUM CHECK
1. Set the vehicle to the pre-inspection condition.
2. Turn the ignition switch to the “LOCK” (OFF) position.
3. Set the engine tachometer or connect the MUT-II.
4. Check that the idle speed is within the standard value.
NOTE
When using the MUT-II, select the code No.22.
5. Connect the three-way union joint to the vacuum hose
between the fuel pressure control valve and the air intake
plenum, and connect a vacuum gauge.
6. Check the manifold vacuum at idle.
Limit: 58 kPa
7. Turn the ignition switch to the “LOCK” (OFF) position.
8. Remove the vacuum gauge and install the vacuum hose
in its original location.
9. Remove the engine tachometer or the MUT-II.
LASH ADJUSTER CHECK
If an abnormal noise (knocking) that seems to be coming
from the lash adjuster is heard after starting the engine and
does not stop, carry out the following check.
NOTE
(1) The abnormal noise which is caused by a problem
with the lash adjusters is generated after the engine
is started, and will vary according to the engine speed.
However, this noise is not related to the actual engine
load.
Because of this, if the noise does not occur
immediately after the engine is started, if it does not
change in accordance with the engine speed, or if
it changes in accordance with the engine load, the
source of the noise is not the lash adjusters.
Vacuum gauge
Fuel pressure
control valve
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