Mitsubishi Lancer Evolution X. Manual - part 65

ON-VEHICLE SERVICE

TSB Revision

ENGINE MECHANICAL

11A-13

3. Set the timing light to the power supply line (terminal No. 4)

of the ignition coil No. 1.

4. Start the engine.
5. Run the engine at idle for 2 minutes.
6. Check the actual ignition timing is at the standard value.

Standard value: Approximately 10° BTDC

NOTE: Ignition timing fluctuates about

, even under nor-

mal operating condition.
NOTE: It is automatically further advanced by about 5

from

Before Top Dead Center at higher altitudes.

NOTE: Wait till approximately 1 minute passes after the
engine started, and check the ignition timing when the
engine stabilized.

7. Check the idle speed. Select item number 2 and take a

reading of the idle speed.

Curb idle speed: 700 ± 100 r/min

NOTE: The idle speed is controlled automatically by the idle
air control system.

8. If the idle speed is outside the standard value, refer to

GROUP 13A, Multiport Fuel Injection (MFI) − Multiport Fuel

Injection (MFI) Diagnosis − Symptom Chart

P.13A-52

9. Remove the timing light.

CAUTION

To prevent damage to scan tool MB991958, always turn the
ignition switch to the "LOCK" (OFF) position before con-
necting or disconnecting scan tool MB991958.
10.Disconnect scan tool MB991958 from the data link

connector.

IDLE MIXTURE CHECK

M1111002101872

Required Special Tool:
MB991958: Scan Tool (M.U.T.-III Sub Assembly)

• MB991824: V.C.I.
• MB991827: M.U.T.-III USB Cable
• MB991910: M.U.T.-III Main Harness A

1. Before inspection, set the vehicle in the following condition:

• Engine coolant temperature: 80 − 95° C (176 − 203° F)
• Lights and all accessories: OFF
• Transaxle: Neutral (P range on vehicles with TC-SST)

NOTE: On vehicles for Canada, the headlight, taillight, etc.
remain lit even when the lighting switch is in "OFF" position
but this is no problem for checks.

AK703277

Power supply line
(terminal No. 4)

Equipment side
connector

No. 1 ignition coil

ON-VEHICLE SERVICE

TSB Revision

ENGINE MECHANICAL

11A-14

CAUTION

To prevent damage to scan tool MB991958, always turn the
ignition switch to the "LOCK" (OFF) position before con-
necting or disconnecting scan tool MB991958.
2. Connect scan tool MB991958 to the data link connector.

3. Set the timing light to the power supply line (terminal No. 4)

of the ignition coil No. 1.

4. Start the engine and let it run at idle.
5. Check that the actual ignition timing is at the standard value.

Standard value: Approximately 10° BTDC

NOTE: Ignition timing fluctuates about

, even under nor-

mal operating condition.
NOTE: It is automatically further advanced by about 5

from

Before Top Dead Center at higher altitudes.

NOTE: Wait till approximately 1 minute passes after the
engine started, and check the ignition timing when the
engine stabilized.

6. Run the engine and increase the engine speed to 2,000 −

3,000 r/min for 2 minutes.

7. Set the CO, HC tester.
8. Check the CO contents and the HC contents at idle.

Standard value:

CO contents: 0.5% or less
HC contents: 100 ppm or less

9. If there is a deviation from the standard value, inspect the

MFI system (Refer to GROUP 13A − Multiport Fuel Injection

(MFI) − Multiport Fuel Injection (MFI) Diagnosis − Symptom

Chart

P.13A-52

)

10.Remove the CO.HC tester and timing light.

AC608435

Data link connector

MB991827

MB991824

MB991910

AK703277

Power supply line
(terminal No. 4)

Equipment side
connector

No. 1 ignition coil

ON-VEHICLE SERVICE

TSB Revision

ENGINE MECHANICAL

11A-15

CAUTION

To prevent damage to scan tool MB991958, always turn the
ignition switch to the "LOCK" (OFF) position before con-
necting or disconnecting scan tool MB991958.
11.Disconnect scan tool MB991958 from the data link

connector.

COMPRESSION PRESSURE CHECK

M1111002602858

Required Special Tool:
MB991958: Scan Tool (M.U.T.-III Sub Assembly)

• MB991824: V.C.I.
• MB991827: M.U.T.-III USB Cable
• MB991910: M.U.T.-III Main Harness A

1. Before inspection, check that the engine oil, starter and

battery are normal. Also, set the vehicle in the following
condition:

• Engine coolant temperature: 80 − 95° C (176 − 203° F)
• Lights and all accessories: OFF
• Transaxle: Neutral (P range on vehicles with TC-SST)

NOTE: On vehicles for Canada, the headlight, taillight, etc.
remain lit even when the lighting switch is in "OFF" position
but this is no problem for checks.

2. Disconnect the connector of the ignition coil, and then

remove all the ignition coils and the spark plugs.

3. Disconnect the all of the injector connectors.

WARNING

Keep your distance from the spark plug hole when
cranking. Oil, fuel, etc., may spray out from the spark
plug hole and may cause serious injury.

4. Cover the spark plug hole with a shop towel etc., after the

engine has been cranked, check that no foreign material is
adhering to the shop towel.

5. Set compression gauge to one of the spark plug holes.
6. Crank the engine with the throttle valve fully open and

measure the compression pressure.

Standard value (at engine speed of 200 r/min): 1,090

kPa (158 psi)

Limit (at engine speed of 200 r/min): Minimum 750

kPa (109 psi)

7. Measure the compression pressure for all the cylinders, and

check that the pressure differences of the cylinders are
below the limit.

Limit: Maximum 100 kPa (14 psi)

8. 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 from 5 to 7.

AK502603AE

Injector
connectors

AK502604AE

Compression gauge

ON-VEHICLE SERVICE

TSB Revision

ENGINE MECHANICAL

11A-16

(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.

9. Connect the all of the injector connector.
10.Install the spark plugs and ignition coils.
11.Use the scan tool MB991958 to erase the diagnosis codes.

NOTE: This will erase the diagnosis code resulting from the
injector connectors being disconnected.

MANIFOLD VACUUM CHECK

M1111002701711

Required Special Tool:
MB991958: Scan Tool (M.U.T.-III Sub Assembly)

• MB991824: V.C.I.
• MB991827: M.U.T.-III USB Cable
• MB991910: M.U.T.-III Main Harness A

1. Before inspection, set the vehicle in the following condition:

• Engine coolant temperature: 80 − 95° C (176 − 203° F)
• Lights and all accessories: OFF
• Transaxle: Neutral (P range on vehicles with TC-SST)

NOTE: On vehicles for Canada, the headlight, taillight, etc.
remain lit even when the lighting switch is in "OFF" position
but this is no problem for checks.

AC608435

Data link connector

MB991827

MB991824

MB991910

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